Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....107..720p&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 107, no. 2, p. 720-728
Astronomy and Astrophysics
Astronomy
15
Absorption Spectra, Atomic Spectra, Binary Stars, Galactic Clusters, Line Spectra, Lithium, Orbital Elements, Pre-Main Sequence Stars, Stellar Orbits, Stellar Spectra, Visible Spectrum, Absorption Spectroscopy, Astronomical Spectroscopy, Charge Coupled Devices, Echelle Gratings, Radial Velocity, Spectrographs, Spectroscopic Telescopes, Stellar Mass, Stellar Spectrophotometry
Scientific paper
We report the discovery that the pre-main-sequence star Walker 134 in the young cluster NGC 2264 is a double-lined spectroscopic binary. Both components are G stars with strong Li I 6708 A absorption lines. Twenty radial velocity measurements have been used to determined the orbital elements of this system. The orbit has a period of 6.3532 +/- 0.0012 days and is circular within the limits of our velocity resolution; e less than 0.01. The total system mass is stellar mass sin3 i = 3.16 solar mass with a mass ratio of 1.04. Estimates for the orbit inclination angle and stellar radii place the system near the threshold for eclipse observability; however, no decrease in brightness was seen during two attempts at photometric monitoring. The circular orbit of W 134 fills an important gap in the period distribution of pre-main-sequence binaries and thereby constrains the effectiveness of tidal orbital circularization during the pre-main sequence.
Padgett Deborah Lynne
Stapelfeldt Karl. R.
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