2009A&A...497..177W


Query : 2009A&A...497..177W

2009A&A...497..177W - Astronomy and Astrophysics, volume 497, 177-181 (2009/4-1)

CO in OH/IR stars close to the Galactic Centre.

WINNBERG A., DEGUCHI S., REID M.J., NAKASHIMA J., OLOFSSON H. and HABING H.J.

Abstract (from CDS):

A pilot project has been carried out to measure circumstellar CO emission from three OH/IR stars close to the Galactic centre. The intention was to find out whether it would be possible to conduct a large-scale survey for mass-loss rates using, for example, the Atacama large millimeter array (ALMA). Such a survey would increase our understanding of the evolution of the Galactic bulge. Two millimetre-wave instruments were used: the Nobeyama Millimeter Array at 115GHz and the Submillimeter Array at 230GHz. An interferometer is necessary as a ``spatial filter'' in this region of space because of the confusion with interstellar CO emission. Towards two of the stars, CO emission was detected with positions and radial velocities coinciding within the statistical errors with the corresponding data of the associated OH sources. However, for one of the stars the line profile is not what one expects for an unresolved expanding circumstellar envelope. We believe that this CO envelope is partially resolved and that this star therefore is a foreground star not belonging to the bulge. The results of the observations have shown that it is possible to detect line profiles of circumstellar CO from late-type stars both within and in the direction of the Galactic bulge. ALMA will be able to detect CO emission in short integrations with sensitivity sufficient to estimate mass-loss rates from a large number of such stars.

Abstract Copyright:

Journal keyword(s): stars: AGB and post-AGB - stars: circumstellar matter - stars: mass-loss - Galaxy: bulge - radio lines: ISM - techniques: interferometric

Simbad objects: 10

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Number of rows : 10
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* U Cam C* 03 41 48.1762532767 +62 38 54.397016016   11.5 11.00     C-N5 236 0
2 OH 0.9 +1.3 pA* 17 42 33.0790162842 -27 28 25.844214046           ~ 54 0
3 IRAS 17409-2945 OH* 17 44 09.84864 -29 46 39.8460           ~ 4 0
4 OH 359.76 +0.12 OH* 17 44 34.962 -29 04 35.67           ~ 29 0
5 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12455 0
6 OH 359.97 -0.12 OH* 17 46 01.0 -29 01 23           ~ 19 0
7 OH 0.3 -0.2 OH* 17 47 06.947 -28 44 41.91           ~ 75 1
8 LBN 3 HII 17 47 08.0 -28 46 30           ~ 82 3
9 IRAS 17439-2845 mul 17 47 08.6 -28 46 18           ~ 85 0
10 NAME Galactic Bulge reg ~ ~           ~ 3680 0

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2021.10.26-05:39:14

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