ORFEUS observations of the interstellar CO abundance ratio

Astronomy and Astrophysics – Astronomy

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

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

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

ORFEUS observations of the interstellar CO abundance ratio does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with ORFEUS observations of the interstellar CO abundance ratio, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and ORFEUS observations of the interstellar CO abundance ratio will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-1235157

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.