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

Published online by Cambridge University Press:  26 May 2016

Shinn Jong-Ho ,
Seon Kwang-Il ,
Lee Dae-Hee  and
Min Kyoung-Wook
Shinn Jong-Ho
Affiliation:
Dept. of Physics, Korea Advanced Institute of Science & Technology, Korea
Seon Kwang-Il
Affiliation:
Korea Astronomy Observatory, Korea
Lee Dae-Hee
Affiliation:
Satellite Research Center, Korea Advanced Institute of Science & Technology, Korea
Min Kyoung-Wook
Affiliation:
Dept. of Physics, Korea Advanced Institute of Science & Technology, Korea

Abstract

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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) ~ 1013cm−2 and N(H2) ~ 1019cm−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.

Type
Part 2. Origin
Information
Symposium - International Astronomical Union , Volume 217: Recycling Intergalactic and Interslettar Matter , 2004 , pp. 192 - 193
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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