Atmospheric modelling of the companion star in GRO J1655-40

Michelle Buxton; Stephane Vennes

doi:10.1071/AS01011

Atmospheric modelling of the companion star in GRO J1655-40

Michelle Buxton^*, Stephane Vennes

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

We have measured the rotational velocity of the companion star to be v_rot 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 M_⊙ (1σ) and for the companion star M₂ = 2·76 ± 1·79 M_⊙ (1σ), which is consistent with previous studies. We have also determined T_eff = 6500 ± 50 K and [Fe/H] = -0·15^+0·15_-0·10.

Original language	English
Pages (from-to)	91-97
Number of pages	7
Journal	Publications of the Astronomical Society of Australia
Volume	18
Issue number	1
DOIs	https://doi.org/10.1071/AS01011
Publication status	Published - 2001

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title = "Atmospheric modelling of the companion star in GRO J1655-40",

abstract = "We have measured the rotational velocity of the companion star to be vrot 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 M⊙ (1σ) and for the companion star M2 = 2·76 ± 1·79 M⊙ (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: spectroscopic, Stars: individual (GRO J1655-40), Stars: rotation",

author = "Michelle Buxton and Stephane Vennes",

year = "2001",

doi = "10.1071/AS01011",

language = "English",

volume = "18",

pages = "91--97",

journal = "Publications of the Astronomical Society of Australia",

issn = "1323-3580",

publisher = "Cambridge University Press",

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T1 - Atmospheric modelling of the companion star in GRO J1655-40

AU - Buxton, Michelle

AU - Vennes, Stephane

PY - 2001

Y1 - 2001

N2 - We have measured the rotational velocity of the companion star to be vrot 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 M⊙ (1σ) and for the companion star M2 = 2·76 ± 1·79 M⊙ (1σ), which is consistent with previous studies. We have also determined Teff = 6500 ± 50 K and [Fe/H] = -0·15+0·15-0·10.

AB - We have measured the rotational velocity of the companion star to be vrot 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 M⊙ (1σ) and for the companion star M2 = 2·76 ± 1·79 M⊙ (1σ), which is consistent with previous studies. We have also determined Teff = 6500 ± 50 K and [Fe/H] = -0·15+0·15-0·10.

KW - Binaries: spectroscopic

KW - Stars: individual (GRO J1655-40)

KW - Stars: rotation

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U2 - 10.1071/AS01011

DO - 10.1071/AS01011

M3 - Article

SN - 1323-3580

VL - 18

SP - 91

EP - 97

JO - Publications of the Astronomical Society of Australia

JF - Publications of the Astronomical Society of Australia

IS - 1

ER -

Atmospheric modelling of the companion star in GRO J1655-40

Abstract

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