Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934903s&link_type=abstract
American Astronomical Society, AAS Meeting #219, #349.03
Astronomy and Astrophysics
Astronomy
Scientific paper
The Cosmic Origins Spectrograph (COS) on the Hubble Space Telescope has been observing translucent interstellar clouds to derive elemental depletions, molecular abundances, physical conditions as well as a search for UV diffuse interstellar bands. Of the six stars in our GTO program, by far NGC 2024 No. 1 is the faintest and most reddened, at V = 12.17, B = 13.58, E(B-V) = 1.41, Rv ≈ 5.5, and Av ≈7.8. Thus this star, in the Flame nebula in Orion, has probably the most interstellar gas and dust we will ever observe in UV spectra, pending future space telescopes. By far H2 (estimated from its correlation CH) is the dominant form of hydrogen and almost all of the carbon is in CO molecules, which is unprecedented in UV spectra. We report the hydrogen and CO column densities, depletions of a few elements, molecular abundances, the UV extinction curve, and diffuse bands in the visible spectrum.
Anderson Daniel
Burgh Eric
Destree Joshua
Ferguson Ron
Snow Theodore P.
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