CO-to-H2 Abundance Ratio of the Foreground Gas of the Carina Nebula

Details CO-to-H2 Abundance Ratio of the Foreground Gas of the Carina Nebula CO-to-H2 Abundance Ratio of the Foreground Gas of the Carina Nebula

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..217..192s&link_type=abstract

International Astronomical Union Symposium no. 217, held 14-17 July, 2003 in Sydney, Australia. Edited by P.-A. Duc, J. Braine

Astronomy and Astrophysics

Astronomy

Scientific paper

We analyze CO and H2 absorption lines of the foreground molecular cloud in the Carina nebula. We use HST-STIS(Hubble Space Telescope - Space Telescope Imaging Spectrograph) & IUE (International Ultraviolet Explorer) INES data to analyze the A-X (v=0→2) absorption band of CO for several hot stars toward the Carina nebula, while 9 stars of them have FUSE (Far Ultraviolet Spectroscopic Explorer) spectra to analyze the (v=0→4) vibrational band in the Lyman series of H2. The column densities of CO and H2 varies in the vicinity of N(CO) ˜ 1013 cm-2 and N(H2) ˜ 1019 cm-2, respectively. The resultant CO-to-H2 abundance ratio is about 10-6. We investigate the variation of the abundance ratio according to the relative position of the target stars to morphology the molecular cloud in the Carina nebula.

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