GRO J1655-40
Michelle Buxton , Stephane Vennes, PASA, 18 (1), in press.
Next Section: Introduction
Atmospheric Modelling of the Companion Star in
GRO J1655-40
Michelle Buxton 1
Stephane Vennes 2
1 Research School of Astronomy & Astrophysics, Australian National University, Mount Stromlo Observatory, Cotter Road, Weston, ACT, Australia, 2602
buxton@mso.anu.edu.au
2 Department of Mathematics, Australian National University, John Dedman Building, Canberra, ACT, Australia, 0200
vennes@maths.anu.edu.au
Abstract:
We have measured the rotational velocity of the companion star to be 
= 80 
10 kms-1 (1
) 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
(1) and the companion star M2 = 2.76 1.79 M (1) which is consistent with previous studies. We have also determined Teff = 6500 50K and [Fe/H] = -0.15
= 80 10 kms-1 (1) 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 (1) and the companion star M2 = 2.76 1.79 M (1) which is consistent with previous studies. We have also determined Teff = 6500 50K and [Fe/H] = -0.15
+0.15-0.10.
Keywords:
binaries: spectroscopic, stars: individual (GRO J1655-40), stars: rotation
- Introduction
- Measuring the Mass of the Compact Object from Companion Star Data
- Companion Star in GRO J1655-40
- Observations and Data Reduction
- Radial Velocities
- Fitting Code
- Results
- Discussion
- Acknowledgements
- References
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