The Component Star Masses in RW Tri

Details The Component Star Masses in RW Tri The Component Star Masses in RW Tri

2002-12-09

arxiv.org/abs/astro-ph/0212204v1

Astronomy and Astrophysics

Astrophysics

Tex v3.14159, 11 pages with 11 figures, to be published in MNRAS

Scientific paper

10.1046/j.1365-8711.2003.06316.x

We use time-resolved spectra of the cataclysmic variable RW Tri in the I and K-band to determine the orbital velocity of the secondary star using skew mapping and cross correlation techniques respectively. We find radial velocity amplitudes of 250+/-47km/s in the I-band, and 221+/-29km/s in the K-band. We also determine the rotational velocity of the secondary star using the K-band data and find a V(rot)sini of 120+/-20km/s. A combination of these results coupled with an estimate of the effect of heating on the secondary star suggests a mass ratio M_2/M_1 in the range 0.6-1.1; the mass ratio range with no correction for heating is 0.5-0.8. These lead to most likely estimates of the primary and secondary star masses in the range 0.4-0.7 solar mass and 0.3-0.4 solar mass respectively. Further refinement of the stellar masses is hampered by uncertain knowledge of the white dwarf orbital velocity, and we discuss evidence that at least some estimates of the white dwarf velocity are contaminated by non-orbital components.

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