CO J=2-1 EMISSION FROM EVOLVED STARS IN THE GALACTIC BULGE

被引：3

作者：

Sargent, Benjamin A. ^{[1
,2
,3
]}

Patel, N. A. ^{[4
]}

Meixner, M. ^{[1
]}

Otsuka, M. ^{[5
]}

Riebel, D. ^{[6
,7
]}

Srinivasan, S. ^{[5
,8
]}

机构：

[1] Space Telescope Sci Inst, Baltimore, MD 21218 USA

[2] Rochester Inst Technol, Ctr Imaging Sci, Rochester, NY 14623 USA

[3] Rochester Inst Technol, Lab Multiwavelength Astrophys, Rochester, NY 14623 USA

[4] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[5] Acad Sinica, Inst Astron & Astrophys, Taipei 10617, Taiwan

[6] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

[7] USN Acad, Dept Phys, Annapolis, MD 21402 USA

[8] Inst Astrophys Paris, UPMC CNRS UMR7095, F-75014 Paris, France

来源：

ASTROPHYSICAL JOURNAL | 2013年 / 765卷 / 01期

关键词：

circumstellar matter; infrared: stars; radio lines: stars; stars: AGB and post-AGB; GIANT BRANCH STARS; ROTATIONAL LINE-PROFILES; SPITZER-SPACE-TELESCOPE; RED SUPERGIANT STARS; MASS-LOSS HISTORY; ALL-SKY SURVEY; OH/IR STARS; AGB STARS; CENTER REGION; FORMING REGIONS;

D O I：

10.1088/0004-637X/765/1/20

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We observe a sample of eight evolved stars in the Galactic bulge in the CO J = 2-1 line using the Submillimeter Array with angular resolution of 1 ''-4 ''. These stars have been detected previously at infrared wavelengths, and several of them have OH maser emission. We detect CO J = 2-1 emission from three of the sources in the sample: OH 359.943 + 0.260, [SLO2003] A12, and [SLO2003] A51. We do not detect the remaining five stars in the sample because of heavy contamination from the galactic CO emission. Combining CO data with observations at infrared wavelengths constraining dust mass loss from these stars, we determine the gas-to-dust ratios of the Galactic bulge stars for which CO emission is detected. For OH 359.943 + 0.260, we determine a gas mass-loss rate of 7.9 (+/- 2.2) x 10(-5)M(circle dot) yr(-1) and a gas-to-dust ratio of 310 (+/- 89). For [SLO2003] A12, we find a gas mass-loss rate of 5.4 (+/- 2.8) x 10(-5)M(circle dot) yr(-1) and a gas-to-dust ratio of 220 (+/- 110). For [SLO2003] A51, we find a gas mass-loss rate of 3.4 (+/- 3.0) x 10(-5)M(circle dot) yr(-1) and a gas-to-dust ratio of 160 (+/- 140), reflecting the low quality of our tentative detection of the CO J = 2-1 emission from A51. We find that the CO J = 2-1 detections of OH/IR stars in the Galactic bulge require lower average CO J = 2-1 backgrounds.

引用

页数：12

共 59 条

[1] GLIMPSE.: I.: An SIRTF legacy project to map the inner galaxy [J].

Benjamin, RA ;

Churchwell, E ;

Babler, BL ;

Bania, TM ;

Clemens, DP ;

Cohen, M ;

Dickey, JM ;

Indebetouw, R ;

Jackson, JM ;

Kobulnicky, HA ;

Lazarian, A ;

Marston, AP ;

Mathis, JS ;

Meade, MR ;

Seager, S ;

Stolovy, SR ;

Watson, C ;

Whitney, BA ;

Wolff, MJ ;

Wolfire, MG .

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 2003, 115 (810) :953-964

[2] Exploring wind-driving dust species in cool luminous giants I. Basic criteria and dynamical models of M-type AGB stars [J].

Bladh, S. ;

Hofner, S. .

ASTRONOMY & ASTROPHYSICS, 2012, 546

[3]

Blommaert JADL, 1998, ASTRON ASTROPHYS, V329, P991

[4] The Spitzer/GLIMPSE Surveys: A New View of the Milky Way [J].

Churchwell, Ed ;

Babler, Brian L. ;

Meade, Marilyn R. ;

Whitney, Barbara A. ;

Benjamin, Robert ;

Indebetouw, Remy ;

Cyganowski, Claudia ;

Robitaille, Thomas P. ;

Povich, Matthew ;

Watson, Christer ;

Bracker, Steve .

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 2009, 121 (877) :213-230

[5] Probing the mass-loss history of AGB and red supergiant stars from CO rotational line profiles II. CO line survey of evolved stars: derivation of mass-loss rate formulae [J].

De Beck, E. ;

Decin, L. ;

de Koter, A. ;

Justtanont, K. ;

Verhoelst, T. ;

Kemper, F. ;

Menten, K. M. .

ASTRONOMY & ASTROPHYSICS, 2010, 523

[6] Probing the mass-loss history of AGB and red supergiant stars from CO rotational line profiles - I. Theoretical model - Mass-loss history unravelled in VYCMa [J].

Decin, L. ;

Hony, S. ;

de Koter, A. ;

Justtanont, K. ;

Tielens, A. G. G. M. ;

Waters, L. B. F. M. .

ASTRONOMY & ASTROPHYSICS, 2006, 456 (02) :549-563

[7] FAST WINDS AND MASS LOSS FROM METAL-POOR FIELD GIANTS [J].

Dupree, A. K. ;

Smith, Graeme H. ;

Strader, Jay .

ASTRONOMICAL JOURNAL, 2009, 138 (05) :1485-1501

[8]

Epchtein N, 1999, ASTRON ASTROPHYS, V349, P236

[9] The Infrared Array Camera (IRAC) for the Spitzer Space Telescope [J].

Fazio, GG ;

Hora, JL ;

Allen, LE ;

Ashby, MLN ;

Barmby, P ;

Deutsch, LK ;

Huang, JS ;

Kleiner, S ;

Marengo, M ;

Megeath, ST ;

Melnick, GJ ;

Pahre, MA ;

Patten, BM ;

Polizotti, J ;

Smith, HA ;

Taylor, RS ;

Wang, Z ;

Willner, SP ;

Hoffmann, WF ;

Pipher, JL ;

Forrest, WJ ;

McMurty, CW ;

McCreight, CR ;

McKelvey, ME ;

McMurray, RE ;

Koch, DG ;

Moseley, SH ;

Arendt, RG ;

Mentzell, JE ;

Marx, CT ;

Losch, P ;

Mayman, P ;

Eichhorn, W ;

Krebs, D ;

Jhabvala, M ;

Gezari, DY ;

Fixsen, DJ ;

Flores, J ;

Shakoorzadeh, K ;

Jungo, R ;

Hakun, C ;

Workman, L ;

Karpati, G ;

Kichak, R ;

Whitley, R ;

Mann, S ;

Tollestrup, EV ;

Eisenhardt, P ;

Stern, D ;

Gorjian, V .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2004, 154 (01) :10-17

[10] Infrared extinction toward nearby star-forming regions [J].

Flaherty, K. M. ;

Pipher, J. L. ;

Megeath, S. T. ;

Winston, E. M. ;

Gutermuth, R. A. ;

Muzerolle, J. ;

Allen, L. E. ;

Fazio, G. G. .

ASTROPHYSICAL JOURNAL, 2007, 663 (02) :1069-1082

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