On the binary nature of 1RXS J162848.1-415241

Details On the binary nature of 1RXS J162848.1-415241 On the binary nature of 1RXS J162848.1-415241

2005-06-15

arxiv.org/abs/astro-ph/0506362v2

Astrophys.J. 632 (2005) 514-522

Astronomy and Astrophysics

Astrophysics

15 pages, 5 figures, accepted for publication in ApJ

Scientific paper

10.1086/432907

We present spectroscopy of the optical counterpart to 1RXS J162848.1-41524, also known as the microquasar candidate MCQC J162847-4152. All the data indicate that this X-ray source is not a microquasar, and that it is a single-lined chromospherically active binary system with a likely orbital period of 4.9 days. Our analysis supports a K3IV spectral classification for the star, which is dominant at optical wavelengths. The unseen binary component is most likely a late-type (K7-M) dwarf or a white dwarf. Using the high resolution spectra we have measured the K3 star's rotational broadening to be vsini = 43 +/- 3 km/s and determined a lower limit to the binary mass ratio of q(=M2/M1)>2.0. The high rotational broadening together with the strong CaII H & K / Halpha emission and high-amplitude photometric variations indicate that the evolved star is very chromospherically active and responsible for the X-ray/radio emission.

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