Discovery of a Pre-Main-Sequence Spectrscopic Binary: V773 Tauri

Abstract

view Abstract Citations (64) References (24) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Discovery of a Pre-Main-Sequence Spectrscopic Binary: V773 Tauri Welty, Alan D. Abstract A series of spectra of V773 Tau obtained during a seven night observing run at Kitt Peak National Observatory (KPNO) in 1993 December revealed a double-lined structure. A period of several weeks is indicated by those spectra, which are best fit by a K2 V plus KS V model. Further observations in 1994 March at Penn State's Black Moshannon Observatory (BMO), 1994 December and 1995 January at KPNO, and three archival KPNO spectra from 1988 January and 1992 November constrain the period to be 51.075±0.018 days. The orbit of V773 Tau is eccentric and is seen at moderately high inclination, but probably not high enough for eclipses to occur. RR diagram placement and recent calculations of pre-main-sequence evolution suggest a mass ratio of about 1.78. While highly uncertain, this is higher than the dynamical mass ratio q=1.32±0.06. It is suggested that VLBI structures previously reported may simply be emission from both stars and possible RS CVn-like interaction, rather than huge loop structures. Publication: The Astronomical Journal Pub Date: August 1995 DOI: 10.1086/117562 Bibcode: 1995AJ....110..776W Keywords: STARS: PRE-MAIN SEQUENCE; BINARIES: CLOSE full text sources ADS | data products SIMBAD (4)