Bibcode
Rodríguez-Gil, P.; Shahbaz, T.; Marsh, T. R.; Gänsicke, B. T.; Steeghs, D.; Long, K. S.; Martínez-Pais, I. G.; Armas Padilla, M.; Schwarz, R.; Schreiber, M. R.; Torres, M. A. P.; Koester, D.; Dhillon, V. S.; Castellano, J.; Rodríguez, D.
Referencia bibliográfica
Monthly Notices of the Royal Astronomical Society, Volume 452, Issue 1, p.146-157
Fecha de publicación:
9
2015
Número de citas
17
Número de citas referidas
15
Descripción
We present the first dynamical determination of the binary parameters of
an eclipsing SW Sextantis star in the 3-4 h orbital period range during
a low state. We obtained time-resolved optical spectroscopy and
photometry of HS 0220+0603 during its 2004-2005 low-brightness state, as
revealed in the combined Small & Moderate Aperture Research
Telescope System, IAC80 and M1 Group long-term optical light curve. The
optical spectra taken during primary eclipse reveal a secondary star
spectral type of M5.5 ± 0.5 as derived from molecular band-head
indices. The spectra also provide the first detection of a DAB white
dwarf in a cataclysmic variable. By modelling its optical spectrum we
estimate a white dwarf temperature of 30 000 ± 5000 K. By
combining the results of modelling the white dwarf eclipse from ULTRACAM
light curves with those obtained by simultaneously fitting the emission-
and absorption-line radial velocity curves and I-band ellipsoidal light
curves, we measure the stellar masses to be M1 = 0.87
± 0.09 M⊙ and M2 = 0.47 ± 0.05
M⊙ for the white dwarf and the M dwarf, respectively, and
an inclination of the orbital plane of i ≈ 79°. A radius of
0.0103 ± 0.0007 R⊙ is obtained for the white
dwarf. The secondary star in HS 0220+0603 is likely too cool and
undersized for its mass.
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El estudio de las estrellas binarias es una parte esencial de la astrofísica estelar. Una gran parte de las estrellas de nuestra Galaxia y de otras galaxias se ha formado en sistemas binarios o múltiples, por lo que entender la estructura y evolución de estos sistemas es importante desde el punto de vista estelar y galáctico. Un aspecto en el que
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Rodríguez Gil