ON THE NATURE OF THE COMPANION TO HD-114762

Authors
Citation
A. Hale, ON THE NATURE OF THE COMPANION TO HD-114762, Publications of the Astronomical Society of the Pacific, 107(707), 1995, pp. 22-26
Citations number
29
Categorie Soggetti
Astronomy & Astrophysics
Journal title
Publications of the Astronomical Society of the Pacific
ISSN journal
00046280 → ACNP
Volume
107
Issue
707
Year of publication
1995
Pages
22 - 26
Database
ISI
SICI code
0004-6280(1995)107:707<22:OTNOTC>2.0.ZU;2-F
Abstract
The results of a recent study of coplanarity tendencies between stella r-equatorial and binary-orbital planes are applied to the low-metal F9 V star HD 114762, for which a possible substellar companion was repor ted by Latham et al. (1989, Nature, 339, 38). High-resolution spectros copy is performed on HD 114762 in order to extract its projected rotat ional velocity (v sin i). This is then combined with an expected rotat ional velocity determined via age-scaling, providing an estimate of th e star's equatorial inclination, which when combined with the results of the coplanarity study provides an approximate indication of the com panion's orbital inclination. Although the formal uncertainties in thi s process preclude an accurate estimate of the companion's inclination , the results suggest that the inclination is low, possibly low enough to force the companion's mass above the limit for hydrogen fusion. It is thus possible the companion may be nothing more exotic than a low- mass M star, as opposed to a brown dwarf. These results add support to a similar conclusion recently obtained by Cochran et al. (1991, ApI, 380, L35).