EDP Sciences
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Volume 379, Number 1, November III 2001
Page(s) 82 - 89
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20011302

A&A 379, 82-89 (2001)
DOI: 10.1051/0004-6361:20011302

H $\mathsf{_2}$, HD, and CO at the edge of 30 Dor in the LMC: The line of sight to Sk-69 246

H. Bluhm and K. S. de Boer

Sternwarte, Universität Bonn, Auf dem Hügel 71, 53121 Bonn, Germany

(Received 13 June 2001 / Accepted 10 September 2001)

FUSE and IUE observations of Sk-69 246 , a WN 6 star to the north of 30 Dor , reveal the existence of LMC interstellar gas in at least 3 velocity components. In one of these components FUSE spectra show strong absorption by molecular hydrogen with a column density of $\log N$(H2)=19.6. We investigate the physical conditions in this cloud, which is probably located near the HII region surrounding Sk-69 246 . HD and CO with column densities of ${\approx} 13.9$ and 13.0, respectively, are detected. The N(CO)-to-N(H2) ratio is consistent with values found in the Galaxy. From the population of the rotational levels of H2 we derive a gas temperature of 72 K and a radiation field $U\approx3\times 10^{-15}$ erg s-1 cm-3 at 1000 Å. The fractional abundance $f=2N({\rm H}_2)/[N({\rm\ion{H}{i}})+2N({\rm H}_2)]\approx0.07$ is rather high for an $E(B-V)\la0.1$.

Key words: galaxies: individual: large magellanic cloud -- ISM: abundances -- ISM: molecules -- ultraviolet: ISM

Offprint request: H. Bluhm, hbluhm@aibn44.astro.uni-bonn.de

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