A spectroscopic search for colliding stellar winds in O-type close binary systems. I - AO Cassiopeiae
1991; IOP Publishing; Volume: 375; Linguagem: Inglês
10.1086/170191
ISSN1538-4357
AutoresDouglas R. Gies, Michael S. Wiggs,
Tópico(s)Astrophysics and Star Formation Studies
Resumoview Abstract Citations (40) References (37) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A Spectroscopic Search for Colliding Stellar Winds in O-Type Close Binary Systems. I. AO Cassiopeiae Gies, Douglas R. ; Wiggs, Michael S. Abstract AO Cas, a short-period, double-lined spectroscopic binary, is studied as part of a search for spectroscopic evidence of colliding stellar winds in binary systems of O-type stars. High S/N ratio spectra of the H-alpha and He I 6678-A line profiles are presented, and their orbital-phase-related variations are examined in order to derive the location and motions of high-density circumstellar gas in the system. These profile variations are compared with those observed in the UV stellar wind lines in IUE archival spectra. IUE spectra are also used to derive a system mass ratio by constructing cross-correlation functions of a single-lined phase spectrum with each of the other spectra. The resulting mass ratio is consistent with the rotational line broadening of the primary star, if the primary is rotating synchronously with the binary system. The best-fit models were found to have an inclination of 61.1 deg + or - 3.0 deg and have a primary which is close to filling its critical Roche lobe. Publication: The Astrophysical Journal Pub Date: July 1991 DOI: 10.1086/170191 Bibcode: 1991ApJ...375..321G Keywords: Astronomical Spectroscopy; Binary Stars; Iue; O Stars; Stellar Winds; H Alpha Line; Helium; Hot Stars; Signal To Noise Ratios; Ultraviolet Spectra; Astrophysics; STARS: BINARIES; STARS: INDIVIDUAL CONSTELLATION NAME: AO CASSIOPEIAE; STARS: WINDS; ULTRAVIOLET: SPECTRA full text sources ADS | data products SIMBAD (1) MAST (1) INES (1) Related Materials (4) Part 2: 1992ApJ...396..238W Part 3: 1993ApJ...407..252W Part 4: 1993ApJ...403..752G Part 5: 2001ApJ...554.1070T
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