Computer Science
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986inpr.conf..139b&link_type=abstract
In NASA. Ames Research Center Summer School on Interstellar Processes: Abstracts of Contributed Papers p 139-140 (SEE N87-15043
Computer Science
Chemical Composition, Grain Size, Interstellar Extinction, M Stars, Stellar Envelopes, Ultraviolet Spectra, Binary Stars, Iue, Luminosity, Oxygen, Stellar Systems, Stellar Winds, Supergiant Stars
Scientific paper
Using International Ultraviolet (IUS) archival low-dispersion spectra, ultraviolet spectral extinctions were derived for the circumstellar envelopes of two M supergiants: HD 60414 and HD 213310. The observed stellar systems belong to a class of widely-separated spectroscopic binaries that are called VV Cephei stars. The total extinction was calculated by dividing the reddened fluxes with unreddened comparison fluxes of similar stars (g B2.5 for HD 213310 and a normalized s+B3 for HD 60414) from the reference atlas. After substracting the interstellar extinctions, which were estimated from the E(B-V) reddening of nearby stars, the resultant circumstellar extinctions were normalized at about 3.5 inverse microns. Not only is the 2175 A extinction bump absent in the circumstellar extinctions, but the far-ultraviolet extinction rise is also absent. The rather flat, ultraviolet extinction curves were interpreted as signatures of a population of noncarbonaceous, oxygen-rich grains with diameters larger than the longest observed wavelength.
Buss Richard H. Jr.
Snow P. Jr. Th.
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