Atmospheric modelling of the companion star in GRO J1655-40

Authors
Buxton, M Vennes, S
Citation
M. Buxton et S. Vennes, Atmospheric modelling of the companion star in GRO J1655-40, PUBL ASTRON, 18(1), 2001, pp. 91-97
Citations number
30
Categorie Soggetti
Space Sciences
Journal title
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA
ISSN journal
13233580 → ACNP
Volume
18
Issue
1
Year of publication
2001
Pages
91 - 97
Database
ISI
SICI code
1323-3580(200106)18:1<91:AMOTCS>2.0.ZU;2-3
Abstract
We have measured the rotational velocity of the companion star to be v(rot) sin i = 80 +/- 10 km s(-1) (1 sigma) by fitting Kurucz model spectra to ou r observed spectrum of the black-hole candidate GRO J1655-40. From this we have calculated q = 0.31 +/- 0.08, the mass of the compact object to be M-1 = 7.91 +/- 3.79 M-. (1 sigma) and for the companion star M-2 = 2.76 +/- 1. 79 M-. (1 sigma), which is consistent with previous studies. We have also d etermined T-eff = 6500 +/- 50 K and [Fe/H] = -0.15(-0.10)(+0.15).