J/A+A/400/903 The ISOGAL field FC-01863+00035 (Jiang+, 2003)
The ISOGAL field FC-01863+00035: Mid-IR interstellar extinction and
stellar populations
Jiang B.W., Omont A., Ganesh S., Simon G., Schuller F.
<Astron. Astrophys. 400, 903 (2003)>
=2003A&A...400..903J 2003A&A...400..903J
ADC_Keywords: Infrared sources ; Cross identifications ; Photometry, infrared
Keywords: stars: AGB and post-AGB - stars: late-type -
stars: pre-main sequences - ISM: extinction -
Galaxy: stellar content - infrared: stars
Abstract:
A 0.35x0.29° field centered at l=-18.63°, b=0.35° was
observed during the ISOGAL survey by ISOCAM imaging at 7µm and
15µm. 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 7µm through AKs-A7=0.35(AJ-AKs)
which yields A7/Av∼0.03 from the near-IR extinction values of van de
Hulst-Glass (Glass, 1999MNRAS.308..127G 1999MNRAS.308..127G). The extinction structure
along the line of sight is then determined from the values of J-Ks 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.
Description:
The table lists the 25 sources in the ISOGAL field FC-01863+00035
which are cross-identified with the MSX PSC (Cat. V/107) catalog. In
an attempt to study the stellar population in the mid-IR survey ISOGAL
at 7 and 15µm the ISOGAL sources in this field are all searched for
both IRAS (Cat. II/125)and MSX correspondences. The cross
identification with the IRAS PSC sources resulted in 9 associations
and the result is presented in the paper. The cross-identification
with the MSX PSC catalog was performed with a radius of 10 arcsecond,
which is about 4 sigma level of the MSX astrometric accuracy. Because
of the lower photometric sensitivity, only the associations with
[7]<7.0 are considered right. In addition, the MSX observation was
poor in the so-called 'B band' at about 4.3µm, so we drop the MSX
photometric results in this 'B' band. The objects which are also
identified with the IRAS PSC sources are shown in the paper.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 159 25 ISOGAL sources cross-identified with
the MSX PSC sources
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See also:
V/98 : MSX Infrared Astrometric Catalog (Egan+ 1996)
V/107 : MSX5C Infrared Point Source Catalog (Egan+ 1999)
II/125 : IRAS catalogue of Point Sources, Version 2.0 (IPAC 1986)
B/denis : The DENIS database (Epchtein+, 1999)
http://www-isogal.iap.fr : ISOGAL Home Page
Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq Sequence number in this ISOGAL field
6- 13 A8 --- --- [ISOGALP-]
14- 29 A16 --- ISOGAL ISOGAL name in the ISOGAL PSC
31- 39 F9.5 deg GLON [-19/-17] ISOGAL Galactic longitude (J2000)
41- 49 F9.5 deg GLAT ISOGAL Galactic latitude (J2000)
51- 55 F5.2 mag Imag ?=99.99 Magnitude in DENIS I band
57- 61 F5.2 mag Jmag ?=99.99 Magnitude in DENIS J band
63- 67 F5.2 mag Ksmag ?=99.99 Magnitude in DENIS Ks band
69- 73 F5.2 mag [7]mag Magnitude in the ISOGAL LW2 band
75- 79 F5.2 mag [15]mag Magnitude in the ISOGAL LW3 band
81- 86 A6 --- --- [MSX5C_]
87-103 A17 --- MSX MSX PSC name (Cat. V/107)
106-113 F8.4 deg RAdeg MSX PSC Right ascension (J2000)
116-123 F8.4 deg DEdeg MSX PSC Declination (J2000)
126-132 F7.3 Jy SMSXA Flux density in the MSX A band (6.8-10.8µm)
135-141 F7.3 Jy SMSXC Flux density in the MSX C band (11.1-13.2µ)
144-150 F7.3 Jy SMSXD Flux density in the MSX D band (13.5-15.9µm)
153-159 F7.3 Jy SMSXE Flux density in the MSX E band (18-25µm)
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Acknowledgements: Biwei Jiang
(End) Patricia Bauer [CDS] 11-Mar-2003