Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-01-21
Astronomy and Astrophysics
Astrophysics
5 pages, 2 tables, 1 figues. Accepted for publication in MNRAS
Scientific paper
10.1111/j.1365-2966.2008.12987.x
We apply the K-correction to the black hole LMXB GX 339-4 which implies Mx > 6 Msun by only assuming that the companion is more massive than ~0.17 Msun, the lower limit allowed by applying a 'stripped-giant' model. This evolutionary model successfully reproduces the observed properties of the system. We obtain a maximum mass for the companion of M2 < 1.1 Msun and an upper limit to the mass ratio of q(=M2/Mx)< 0.125. The high X-ray activity displayed by the source suggests a relatively large mass transfer rate which, according to the model, results in M2 > 0.3 Msun and Mx > 7 Msun. We have also applied this scenario to the black hole binary XTE J1550-564, which has a similar orbital period but the donor is detected spectroscopically. The model successfully reproduces the observed stellar parameters.
Casares Jorge
Gonzalez Martinez-Pais I.
Muñoz-Darias Teo
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