Grain ultraviolet extinction properties of recently discovered POST asymptotic giant branch stars
1989; IOP Publishing; Volume: 347; Linguagem: Inglês
10.1086/168188
ISSN1538-4357
AutoresJr. Buss Richard H., Jr. Snow T. P., H. J. G. L. M. Lamers,
Tópico(s)Astrophysics and Star Formation Studies
Resumoview Abstract Citations (45) References (57) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Grain Ultraviolet Extinction Properties of Recently Discovered Post--Asymptotic Giant Branch Stars Buss, Richard H., Jr. ; Lamers, Henny J. G. L. M. ; Snow, Theodore P., Jr. Abstract The circumstellar grains of two hot evolved postasymptotic giant branch stars, HD 89353 and HD 213985, are examined, deriving the extinction around 2175 A. An unsuccessful attempt to detect 6614 A diffuse band absorption arising from the grains implies that the carrier of this diffuse band is not the carrier of the unidentified IR features reported by other investigators nor of the 2175 A bump. It is found that the linear UV extinction of the carbon-rich star HD 89353 continues across the 2175 A region with no sign of the bump; for HD 213985 the reverse is found: a strong, wide bump in the mid-UV. A wavelength of 2300 A is derived for the HD 213985 bump, which lies longward of its unusual position in the interstellar medium. Since HD 89353 is metal-poor yet rich in hydrogen and carbon, the linear extinction arises from hydrocarbon grains of radius less than 300 A. Publication: The Astrophysical Journal Pub Date: December 1989 DOI: 10.1086/168188 Bibcode: 1989ApJ...347..977B Keywords: Asymptotic Giant Branch Stars; Infrared Spectra; Interstellar Extinction; Late Stars; Stellar Envelopes; Ultraviolet Spectra; Emission Spectra; Interstellar Matter; Stellar Models; Stellar Spectra; Astrophysics; INTERSTELLAR: GRAINS; STARS: CIRCUMSTELLAR SHELLS; STARS: INDIVIDUAL HENRY DRAPER NUMBER: HD 89353; STARS: INDIVIDUAL HENRY DRAPER NUMBER: HD 213985; STARS: LATE-TYPE; ULTRAVIOLET: SPECTRA full text sources ADS | data products SIMBAD (6) MAST (1) INES (1)
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