Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aj....111..231j&link_type=abstract
Astronomical Journal v.111, p.231
Astronomy and Astrophysics
Astronomy
9
Galaxy: Stellar Content, Infrared: Stars
Scientific paper
The optical identifications at both V and I bands are given of 102 color-selected IRAS PSC sources in the outer disk of our Galaxy. The positions were obtained from CCD images by using stars in the same frame and listed in the GSC catalogue (Guide Star Catalogue for Hubble Space Telescope) as references. The identification was judged from the consistency with IRAS parameters in three aspects: the position, color, and light variation. About 50% of these sources are found to have optical counterpart. We identified 47 sources as variable stars, 2 as nonvariable stars. There are 1 star that has not been checked for light variation and 9 sources associated with nebulosity in the sample. We did not find optical counterparts for 43 sources until 20 mag at V band and 19 mag at I band. The data suggest that whether or not an IRAS PSC source can be optically identified results from not only the IRAS colors but also the C/O abundance in such a way that an oxygen-rich source may be more likely to be identified than a carbon-rich source.
Deguchi Shigeki
Jiang Bi-Wei
Nakada Yoshikazu
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