Issue |
A&A
Volume 400, Number 3, March IV 2003
|
|
---|---|---|
Page(s) | 903 - 915 | |
Section | Galactic structure, stellar clusters, and populations | |
DOI | https://doi.org/10.1051/0004-6361:20030004 | |
Published online | 07 March 2003 |
The ISOGAL field FC–01863+00035: Mid-IR interstellar extinction and stellar populations *,**,***
1
Department of Astronomy, Beijing Normal University, Beijing 100875, PR China
2
Institut d'Astrophysique de Paris, CNRS, 98 bis Bd Arago, 75014 Paris, France
3
National Astronomical Observatories, Chinese Academy of Sciences, Datun Rd. No.20(A), Beijing 100012, PR China (on leave)
4
Physical Research Laboratory, Navarangpura, Ahmedabad 380009, India
5
GEPI, Observatoire de Paris, 21 avenue de l'Observatoire, 75014 Paris, France
Corresponding author: B. W. Jiang, bjiang@bnu.edu.cn
Received:
18
July
2002
Accepted:
23
December
2002
A 0.35° 0.29°field centered at
°,
°
was observed during the ISOGAL survey by ISOCAM imaging at 7 μm
and 15 μm. 648 objects were detected and their brightness
are measured.
By combining with the DENIS data in the near-infrared J and KS bands,
one derives the extinction at 7 μm through
which yields
from
the near-IR extinction values of van de Hulst–Glass (Glass 1999).
The extinction
structure along the line of sight is then determined from the values
of
or KS–[7] of the ISOGAL sources identified as RGB or early
AGB stars with mild mass-loss. The distribution of AV ranges from
0 to ~45 and it reflects the concentration of the extinction in
the spiral arms. Based on their locations in color-magnitude diagrams
and a few cross-identifications with IRAS and MSX sources, the nature
of objects is discussed in comparison with the case of a low
extinction field in Baade's Window. Most of the objects are either AGB
stars with moderate mass loss rate or luminous RGB stars. Some of them may be
AGB stars with high mass loss rate. In addition,
a few young stellar objects (YSOs) are present.
Key words: stars: AGB and post-AGB / stars: late-type / stars: mass loss / stars: pre-main sequence / ISM: dust, extinction / Galaxy: stellar content / Infrared: stars
© ESO, 2003
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