Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-03-22
Astronomy and Astrophysics
Astrophysics
10 pages, 4 figures, accepted by MNRAS
Scientific paper
10.1046/j.1365-8711.2002.05521.x
We present high and intermediate resolution spectroscopy of the X-ray nova Centaurus X-4 during its quiescent phase. Our analysis of the absorption features supports a K3-K5V spectral classification for the companion star, which contributes approximately 75 % of the total flux at Halpha. Using the high resolution spectra we have measured the secondary star's rotational broadening to be V_rot*sin(i) = 43 +/- 6 km/s and determined a binary mass ratio of q=0.17 +/- 0.06. Combining our results for K_2 and q with the published limits for the binary inclination, we constrain the mass of the compact object and the secondary star to the ranges 0.49 < M_1 < 2.49 Msun and 0.04 < M_2 < 0.58 Msun. A Doppler image of the Halpha line shows emission coming from the secondary star, but no hotspot is present. We discuss the possible origins of this emission.
Casares Jorge
Charles Phil A.
Gonzalez Martinez-Pais I.
Torres Manuel A. P.
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