| Records |
| Author |
Sargent, B.A.; Srinivasan, S.; Speck, A.; Volk, K.; Kemper, C.; Reach, W.T.; Lagadec, E.; Bernard, J.-P.; McDonald, I.; Meixner, M. |
| Title |
Spitzer-IRS Spectroscopic Studies of Oxygen-Rich Asymptotic Giant Branch Star and Red Supergiant Star Dust Properties |
Type |
Conference Article |
| Year |
2015 |
Publication |
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Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
216.03-216.03 |
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| Abstract |
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Place of Publication |
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Summary Language |
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Original Title |
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Series Title |
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Abbreviated Series Title |
American Astronomical Society Meeting Abstracts |
| Series Volume |
225 |
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Expedition |
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| Notes |
proceedings |
Approved |
no |
Call Number  |
ASIAA @ ciska @ |
Serial |
41812 |
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| Author |
Sloan, G.C.; Groenewegen, M.; Srinivasan, S.; Lagadec, E.; Kraemer, K.E.; McDonald, I.; Boyer, M.L.; Zijlstra, A.; Kemper, C. |
| Title |
Dust and metallicity in carbon stars |
Type |
Conference Article |
| Year |
2015 |
Publication |
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Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
216.04-216.04 |
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Original Title |
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Series Title |
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Abbreviated Series Title |
American Astronomical Society Meeting Abstracts |
| Series Volume |
225 |
Series Issue |
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Edition |
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ISBN |
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Medium |
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Expedition |
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Conference |
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| Notes |
proceedings |
Approved |
no |
| Call Number |
ASIAA @ ciska @ |
Serial |
41813 |
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| Author |
Naslim, N.; Kemper, F.; Madden, S.C.; Hony, S.; Chu, Y.-H.; Galliano, F.; Bot, C.; Yang, Y.; Seok, J.; Oliveira, J.M.; van Loon, J.T.; Meixner, M.; Li, A.; Hughes, A.; Gordon, K.D.; Otsuka, M.; Hirashita, H.; Morata, O.; Lebouteiller, V.; Indebetouw, R.; Srinivasan, S.; Bernard, J.-P.; Reach, W.T. |
| Title |
Molecular hydrogen emission in the interstellar medium of the Large Magellanic Cloud |
Type |
Journal Article |
| Year |
2015 |
Publication |
Mon.~Not.~R.~Astron.~Soc. |
Abbreviated Journal |
|
| Volume |
446 |
Issue |
3 |
Pages |
2490-2504 |
| Keywords |
ISM: molecules; photodissociation region (PDR); galaxies: ISM; Magellanic Cloud; infrared: ISM |
| Abstract |
We present the detection and analysis of molecular hydrogen emission towards ten interstellar regions in the Large Magellanic Cloud. We examined low-resolution infrared spectral maps of 12 regions obtained with the Spitzer infrared spectrograph (IRS). The pure rotational 0-0 transitions of H2 at 28.2 and 17.1 μm are detected in the IRS spectra for 10 regions. The higher level transitions are mostly upper limit measurements except for three regions, where a 3σ detection threshold is achieved for lines at 12.2 and 8.6 μm. The excitation diagrams of the detected H2 transitions are used to determine the warm H2 gas column density and temperature. The single-temperature fits through the lower transition lines give temperatures in the range 86-137 K. The bulk of the excited H2 gas is found at these temperatures and contributes ˜5-17 per cent to the total gas mass. We find a tight correlation of the H2 surface brightness with polycyclic aromatic hydrocarbon and total infrared emission, which is a clear indication of photoelectric heating in photodissociation regions. We find the excitation of H2 by this process is equally efficient in both atomic- and molecular-dominated regions. We also present the correlation of the warm H2 physical conditions with dust properties. The warm H2 mass fraction and excitation temperature show positive correlations with the average starlight intensity, again supporting H2 excitation in photodissociation regions. |
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| Notes |
refereed; Owner: ciska; Added to JabRef: 2015.04.15 |
Approved |
no |
| Call Number |
ASIAA @ ciska @ |
Serial |
41815 |
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| Author |
Ruffle, P.M.E.; Kemper, F.; Jones, O.C.; Sloan, G.C.; Kraemer, K.E.; Woods, P.M.; Boyer, M.L.; Srinivasan, S.; Antoniou, V.; Lagadec, E.; Matsuura, M.; McDonald, I.; Oliveira, J.M.; Sargent, B.A.; Sewiło, M.; Szczerba, R.; van Loon, J.T.; Volk, K.; Zijlstra, A.A. |
| Title |
Spitzer infrared Spectrograph point source classification in the Small Magellanic Cloud |
Type |
Journal Article |
| Year |
2015 |
Publication |
Mon.~Not.~R.~Astron.~Soc. |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
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| Keywords |
my_papers |
| Abstract |
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Edition |
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Expedition |
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Conference |
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| Notes |
submitted; Owner: ciska; Added to JabRef: 2015.03.04 |
Approved |
no |
| Call Number |
ASIAA @ ciska @ |
Serial |
41816 |
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| Author |
Zhao-Geisler, R.; Köhler, R.; Kemper, F.; Kerschbaum, F.; Mayer, A.; Quirrenbach, A.; Lopez, B. |
| Title |
Spectro-imaging of the asymmetric inner molecular and dust shell region of the Mira variable W Hya with MIDI/VLTI |
Type |
Journal Article |
| Year |
2015 |
Publication |
Pub.~Astron.~Soc.~Pacific |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
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| Keywords |
my_papers |
| Abstract |
We have observed W Hya, one of the closest and best studied oxygen-rich evolved star, in the dust |
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Place of Publication |
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Original Title |
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Series Title |
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Abbreviated Series Title |
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Edition |
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ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
submitted; Owner: ciska; Added to JabRef: 2015.04.15 |
Approved |
no |
| Call Number |
ASIAA @ ciska @ |
Serial |
41817 |
| Permanent link to this record |
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| Author |
Jones, O.C.; McDonald, I.; Rich, R.M.; Kemper, F.; Boyer, M.L.; Zijlstra, A.A.; Bendo, G.J. |
| Title |
A Spitzer Space Telescope survey of extreme asymptotic giant branch stars in M32 |
Type |
Journal Article |
| Year |
2015 |
Publication |
Mon.~Not.~R.~Astron.~Soc. |
Abbreviated Journal |
|
| Volume |
446 |
Issue |
2 |
Pages |
1584-1596 |
| Keywords |
stars: AGB and post-AGB; stars: late-type; stars: mass-loss; galaxies: individual: M32; galaxies: stellar content; infrared: stars |
| Abstract |
We investigate the population of cool, evolved stars in the Local Group dwarf elliptical galaxy M32, using Infrared Array Camera observations from the Spitzer Space Telescope. We construct deep mid-infrared colour-magnitude diagrams for the resolved stellar populations within 3.5 arcmin of M32's centre, and identify those stars that exhibit infrared excess. Our data are dominated by a population of luminous, dust-producing stars on the asymptotic giant branch (AGB) and extend to approximately 3 mag below the AGB tip. We detect for the first time a sizeable population of `extreme' AGB stars, highly enshrouded by circumstellar dust and likely completely obscured at optical wavelengths. The total dust-injection rate from the extreme AGB candidates is measured to be 7.5 × 10-7 M⊙ yr-1, corresponding to a gas mass-loss rate of 1.5 × 10-4 M⊙ yr-1. These extreme stars may be indicative of an extended star formation epoch between 0.2 and 5 Gyr ago. |
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Place of Publication |
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Summary Language |
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Original Title |
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Expedition |
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Conference |
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| Notes |
refereed; Owner: ciska; Added to JabRef: 2015.04.15 |
Approved |
no |
| Call Number |
ASIAA @ ciska @ |
Serial |
41992 |
| Permanent link to this record |
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| Author |
Naslim, N.; Kemper, F.; Madden, S.C.; Hony, S.; Chu, Y.-H.; Galliano, F.; Bot, C.; Yang, Y.; Seok, J.; Oliveira, J.M.; van Loon, J.T.; Meixner, M.; Li, A.; Hughes, A.; Gordon, K.D.; Otsuka, M.; Hirashita, H.; Morata, O.; Lebouteiller, V.; Indebetouw, R.; Srinivasan, S.; Bernard, J.-P.; Reach, W.T. |
| Title |
Molecular hydrogen emission in the interstellar medium of the Large Magellanic Cloud |
Type |
Journal Article |
| Year |
2015 |
Publication |
Mon.~Not.~R.~Astron.~Soc. |
Abbreviated Journal |
|
| Volume |
446 |
Issue |
3 |
Pages |
2490-2504 |
| Keywords |
ISM: molecules; photodissociation region (PDR); galaxies: ISM; Magellanic Cloud; infrared: ISM |
| Abstract |
We present the detection and analysis of molecular hydrogen emission towards ten interstellar regions in the Large Magellanic Cloud. We examined low-resolution infrared spectral maps of 12 regions obtained with the Spitzer infrared spectrograph (IRS). The pure rotational 0-0 transitions of H2 at 28.2 and 17.1 μm are detected in the IRS spectra for 10 regions. The higher level transitions are mostly upper limit measurements except for three regions, where a 3σ detection threshold is achieved for lines at 12.2 and 8.6 μm. The excitation diagrams of the detected H2 transitions are used to determine the warm H2 gas column density and temperature. The single-temperature fits through the lower transition lines give temperatures in the range 86-137 K. The bulk of the excited H2 gas is found at these temperatures and contributes ˜5-17 per cent to the total gas mass. We find a tight correlation of the H2 surface brightness with polycyclic aromatic hydrocarbon and total infrared emission, which is a clear indication of photoelectric heating in photodissociation regions. We find the excitation of H2 by this process is equally efficient in both atomic- and molecular-dominated regions. We also present the correlation of the warm H2 physical conditions with dust properties. The warm H2 mass fraction and excitation temperature show positive correlations with the average starlight intensity, again supporting H2 excitation in photodissociation regions. |
| Address |
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Thesis |
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| Publisher |
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Place of Publication |
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Editor |
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Summary Language |
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Original Title |
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Series Title |
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Abbreviated Series Title |
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Edition |
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Expedition |
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Conference |
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| Notes |
refereed; Owner: ciska; Added to JabRef: 2015.04.15 |
Approved |
no |
| Call Number |
ASIAA @ ciska @ |
Serial |
42038 |
| Permanent link to this record |
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| Author |
Ruffle, P.M.E.; Kemper, F.; Jones, O.C.; Sloan, G.C.; Kraemer, K.E.; Woods, P.M.; Boyer, M.L.; Srinivasan, S.; Antoniou, V.; Lagadec, E.; Matsuura, M.; McDonald, I.; Oliveira, J.M.; Sargent, B.A.; Sewiło, M.; Szczerba, R.; van Loon, J.T.; Volk, K.; Zijlstra, A.A. |
| Title |
Spitzer infrared Spectrograph point source classification in the Small Magellanic Cloud |
Type |
Journal Article |
| Year |
2015 |
Publication |
Mon.~Not.~R.~Astron.~Soc. |
Abbreviated Journal |
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| Volume |
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Issue |
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Pages |
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| Keywords |
my_papers |
| Abstract |
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Thesis |
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Place of Publication |
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Editor |
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Summary Language |
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Original Title |
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Series Title |
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Abbreviated Series Title |
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Edition |
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Expedition |
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Conference |
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| Notes |
submitted; Owner: ciska; Added to JabRef: 2015.03.04 |
Approved |
no |
| Call Number |
ASIAA @ ciska @ |
Serial |
42053 |
| Permanent link to this record |
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| Author |
Sargent, B.A.; Srinivasan, S.; Speck, A.; Volk, K.; Kemper, C.; Reach, W.T.; Lagadec, E.; Bernard, J.-P.; McDonald, I.; Meixner, M. |
| Title |
Spitzer-IRS Spectroscopic Studies of Oxygen-Rich Asymptotic Giant Branch Star and Red Supergiant Star Dust Properties |
Type |
Conference Article |
| Year |
2015 |
Publication |
|
Abbreviated Journal |
|
| Volume |
|
Issue |
|
Pages |
216.03-216.03 |
| Keywords |
|
| Abstract |
We analyze the dust emission features seen in Spitzer Space Telescope Infrared Spectrograph (IRS) spectra of Oxygen-rich (O-rich) asymptotic giant branch (AGB) and red supergiant (RSG) stars. The spectra come from the Spitzer Legacy program SAGE-Spectroscopy (PI: F. Kemper) and other archival Spitzer-IRS programs. The broad 10 and 20 micron emission features attributed to amorphous dust of silicate composition seen in the spectra show evidence for systematic differences in the centroid of both emission features between O-rich AGB and RSG populations. Radiative transfer modeling using the GRAMS grid of models of AGB and RSG stars suggests that the centroid differences are due to differences in dust properties. We present an update of our investigation of differences in dust composition, size, shape, etc that might be responsible for these spectral differences. We explore how these differences may arise from the different circumstellar environments around RSG and O-rich AGB stars. BAS acknowledges funding from NASA ADAP grant NNX13AD54G. |
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Place of Publication |
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Editor |
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| Language |
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Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
American Astronomical Society Meeting Abstracts |
| Series Volume |
225 |
Series Issue |
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Edition |
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| ISSN |
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ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
proceedings; Owner: ciska; Added to JabRef: 2015.04.16 |
Approved |
no |
| Call Number |
ASIAA @ ciska @ |
Serial |
42059 |
| Permanent link to this record |
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| Author |
Sloan, G.C.; Groenewegen, M.; Srinivasan, S.; Lagadec, E.; Kraemer, K.E.; McDonald, I.; Boyer, M.L.; Zijlstra, A.; Kemper, C. |
| Title |
Dust and metallicity in carbon stars |
Type |
Conference Article |
| Year |
2015 |
Publication |
|
Abbreviated Journal |
|
| Volume |
|
Issue |
|
Pages |
216.04-216.04 |
| Keywords |
|
| Abstract |
The Infrared Spectrograph on the Spitzer Space Telescope observed over 200 carbon stars in nearby metal-poor dwarf galaxies. These spectra probe how the quantity and composition of dust produced by carbon stars depend on initial metallicity, initial mass, and pulsational properties. For stars to produce significant quantities of dust, they must be pulsating in the fundamental mode with strong amplitudes. The spectra confirm that carbon stars with longer pulsation periods produce more dust and that the amount of dust shows no strong dependence on metallicity. This sample includes more carbon stars with low mass and reveals that for a given pulsation period, higher-mass stars produce less dust. Evidence is building for the layering of dust grains, with SiC cores in grains produced by metal-rich carbon stars, and mantles of MgS around grains in all embedded stars. |
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Thesis |
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Place of Publication |
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Editor |
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| Language |
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Summary Language |
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Original Title |
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| Series Editor |
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Series Title |
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Abbreviated Series Title |
American Astronomical Society Meeting Abstracts |
| Series Volume |
225 |
Series Issue |
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Edition |
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| ISSN |
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ISBN |
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Medium |
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| Area |
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Expedition |
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Conference |
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| Notes |
proceedings; Owner: ciska; Added to JabRef: 2015.04.16 |
Approved |
no |
| Call Number |
ASIAA @ ciska @ |
Serial |
42063 |
| Permanent link to this record |
