ORFEUS observations of the interstellar CO abundance ratio

Details ORFEUS observations of the interstellar CO abundance ratio ORFEUS observations of the interstellar CO abundance ratio

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.9702m&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #97.02; Bulletin of the American Astronomical Society, Vol. 33, p.1449

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a survey result of interstellar CO absorption lines in the C-X 1088 Å band toward 52 early-type stars made with the Berkeley Extreme and Far-ultraviolet Spectrometer (BEFS) on the ORFEUS telescope in 1993 and 1996. While the previous survey by Copernicus (Federman et al. 1980) was restricted to the disk stars near the Sun, ORFEUS targets are extended to the halo stars, and even to the LMC's. We set the CO excited temperature to be 4 K to fit the synthesis of the CO bands and obtain the b-value of 1 km s-1 through χ2 minimization. CO column densities are derived in 16 directions and CO/H2 abundance ratios are calculated for each of them with the H2 column density obtained from the same BEFS data. The abundance ratios are consistent with those of Federman et al. (1980). We compare the physical conditions between the halo stars and the disk stars, and discuss the UV radiation density effects on the abundance ratios. Federman et al. 1980, ApJ, 242, 545

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