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The OH/IR star population at the centre of the Galaxy

  • Roberto Ortiz (a1), Alain Omont (a2), Mathias Schultheis (a2), Eric Copet (a2), Harm J. Habing (a3), Maria Messineo (a3), Shashikiran Ganesh (a4) and Joris A. D. L. Blommaert (a5)...

Abstract

In the last years various OH surveys at 1612 MHz have been carried out in the galactic bulge region with high spatial resolution (Lindqvist et al. 1992; Sevenster et al. 1997; Sjouwerman et al. 1998) which have resulted in the detection of over five hundred double-peaked objects commonly associated with oxygen-rich AGB stars. More recently, the ISOGAL survey, which is part of the ISO mission, scanned several regions along the galactic plane, including the inner bulge, at 6.8 and 15 micron wavelengths. In this work we report an analysis of 104 OH/IR stars in the bulge, based on near and mid-infrared observations. Mass-loss rates, luminosities and masses are determined for a sub-sample of stars, for which near-infrared data are available in the literature.

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References

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Blommaert, J.A.D.L., van der Veen, W.E.C.J., van Langevelde, H.J., Habing, H.J., Sjouwerman, L.O. 1998 A&A 329, 991
Glass, I.S., Whitelock, P.A., Catchpole, R.M., Feast, M.W. 1995, MNRAS 273, 383
Jura, M., Kleinmann, 1992, ApJ S79, 105
Koornneef, J. 1983, A&A 128, 84
Lindqvist, M., Winnberg, A., Habing, H.J., Matthews, H.E. 1992, A&A S92, 43
Ortiz, R., Blommaert, J.A.D.L., Copet, E., Ganesh, S., Habing, H.J., Messineo, M., Omont, A., Schultheis, M. 2000, A&A, accepted
Pérault, M., Omont, A., Simon, G., Seguin, P., Ojha, D., Blommaert, J., Felli, M., Gilmore, G., Guglielmo, F., Habing, H., Price, S., Robin, A., de Batz, B., Cesarsky, C., Elbaz, D., Epchtein, N., Fouqué, P., Guest, S., Levine, D., Pollock, A., Prusti, T., Siebenmorgen, R., Testi, L., Tiphène, D. 1996, A&A 315, L165
Schultheis, M., Ganesh, S., Simon, G., Omont, A., Alard, C., Borsenberger, J., Copet, E. 1999, A&A 349, L69
Sevenster, M.N., Chapman, J.M., Habing, H.J., Killeen, N.E.B., Lindqvist, M. 1997, A&A S122, 79
Sjouwerman, L.O., van Langevelde, H.J., Winnberg, A., Habing, H.J. 1998, A&A S128, 35
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The OH/IR star population at the centre of the Galaxy

  • Roberto Ortiz (a1), Alain Omont (a2), Mathias Schultheis (a2), Eric Copet (a2), Harm J. Habing (a3), Maria Messineo (a3), Shashikiran Ganesh (a4) and Joris A. D. L. Blommaert (a5)...

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