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Atmospheric Modelling of the Companion Star in GRO J1655-40

Published online by Cambridge University Press:  05 March 2013

Michelle Buxton  and
Stephane Vennes
Michelle Buxton
Affiliation:
Research School of Astronomy & Astrophysics, Australian National University, Mount Stromlo Observatory, Cotter Road, Weston, ACT 2602, Australia; [email protected]
Stephane Vennes
Affiliation:
Department of Mathematics, Australian National University, John Dedman Building, Canberra, ACT 0200, Australia; [email protected]
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Abstract

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We have measured the rotational velocity of the companion star to be Ʊrot sin i= 80 ± 10 km s ˗1 (1σ) by fitting Kurucz model spectra to our 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 M1 = 7·91 ± 3·79 Mô (1σ) and for the companion starM2 = 2·76 ± 1·79 Mô (1σ), which is consistent with previous studies. We have also determined Teff = 6500 ± 50 K and [Fe/H] = −0·15 +0·15-0·10.

Keywords

binaries: spectroscopicstars:individual (GRO J1655–40)stars: rotation
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 18 , Issue 1 , 2001 , pp. 91 - 97
Copyright
Copyright © Astronomical Society of Australia 2001

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