The ISOGAL field FC--01863+00035: Mid-IR interstellar extinction and stellar populations

Details The ISOGAL field FC--01863+00035: Mid-IR interstellar extinction and stellar populations The ISOGAL field FC--01863+00035: Mid-IR interstellar extinction and stellar populations

2003-02-20

arxiv.org/abs/astro-ph/0302411v1

Astron.Astrophys.400:903-916,2003

Astronomy and Astrophysics

Astrophysics

14 pages, accepted for publication in Astronomy and Astrophysics

Scientific paper

10.1051/0004-6361:20030004

A 0.35\degr $\times$ 0.29\degr field centered at $l$=--18.63\degr, $b$=0.35\degr was observed during the ISOGAL survey by ISOCAM imaging at 7$\mu$m and 15{\rm $\mu$m}. 648 objects were detected and their brightness are measured. By combining with the DENIS data in the near-infrared J and K$_{\rm S}$ bands, one derives the extinction at 7{\rm $\mu$m} through ${\rm A_{K_{\rm S}}-A_7= 0.35 (A_J-A_{K_{\rm S}})}$ which yields A$_{7}$/A$_{\it V}$ $\sim$0.03 from the near-IR extinction values of van de Hulst--Glass (Glass 1999). The extinction structure along the line of sight is then determined from the values of J--K$_{\rm S}$ or K$_{\rm S}$--[7] of the ISOGAL sources identified as RGB or early AGB stars with mild mass-loss. The distribution of A$_{\it V}$ ranges from 0 to $\sim$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.

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