Spectral-line broadening functions of W UMa-type binaries. II - AH VIR

Abstract

view Abstract Citations (34) References (39) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Spectral-Line Broadening Functions of W UMa-Type Binaries. II. AH VIR Lu, W. -X. ; Rucinski, S. M. Abstract Twenty-four 10 A/mm spectra of the W UMa binary AH Vir have been analyzed for radial velocities and for geometrical parameters of the system components by the method of spectral-line broadening functions. It is shown that the broadening functions determined through the linear restoration process are much better defined than cross-correlation functions, even in the presence of broad spectral features. A new spectroscopic orbit for AH Vir has been determined on the basis of radial velocity information contained in the broadening functions. A combination of this orbit with a parallel solution for the geometric elements gave a new set of absolute elements of the system: a = 2.80 solar radii, M1 = 1.36 solar mass, M2 = 0.41 solar mass, R1 = 1.40 solar radius, and R2 = 0.83 solar radius. The absolute bolometric magnitude of the system was found to be 4.07 m and the distance about 94 pc. AH Vir belongs to the OO Aq1 subclass of contact binaries which is characterized by the unusually low effective temperature for the observed large dimensions. The radius of the primary is close to what would be expected if it obeyed the Main-Sequence mass-radius relation, but the luminosity of the system (most likely produced solely by the primary component) is lower than that for the ZAMS. The underluminosity of the system is due to the abnormally low effective temperature which remains significantly low after the energy transfer between components is taken into account. Publication: The Astronomical Journal Pub Date: July 1993 DOI: 10.1086/116645 Bibcode: 1993AJ....106..361L Keywords: Binary Stars; Main Sequence Stars; Spectral Line Width; Stellar Mass; Stellar Spectra; Cross Correlation; Energy Transfer; Mass Transfer; Radial Velocity; Astrophysics; BINARIES: ECLIPSING; BINARIES: SPECTROSCOPIC full text sources ADS | data products SIMBAD (5) Related Materials (2) Part 1: 1992AJ....104.1968R Part 3: 1993AJ....106.1174R