Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...325..864c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 325, Feb. 15, 1988, p. 864-879.
Astronomy and Astrophysics
Astrophysics
90
Dark Matter, Interstellar Extinction, Iue, Line Of Sight, Stellar Coronas, Ultraviolet Spectra, Far Ultraviolet Radiation, Milky Way Galaxy, Molecular Clouds, Stellar Winds, Taurus Constellation
Scientific paper
Low-resolution IUE data obtained toward HD 62542, a B5 V star in a line of sight associated with a dark cloud in the Gum nebula region near ζ Pup and γ Vel, yield an extinction curve with an extremely broad and weak UV extinction bump and the highest far-UV extinction yet observed in the Milky Way, reaching a value of E(1200-V)/E(B-V) ≈ 15. The weak bump is very similar to the bump observed toward HD 29647, a highly reddened late B HgMn star in the Taurus dark cloud. The authors have derived a new extinction curve for HD 29647. The far-UV extinction toward HD 29647 is larger than normal but not as extreme as that observed for HD 62542. An extensive discussion of the nature of the UV-absorbing matter in these two lines-of-sight is given. The role of environmental factors in producing an anomalous, extreme UV extinction is investigated.
Cardelli Jason A.
Savage Blair. D.
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