SIMBAD references

2015MNRAS.452..146R - Mon. Not. R. Astron. Soc., 452, 146-157 (2015/September-1)

Dynamical masses of a nova-like variable on the edge of the period gap.

RODRIGUEZ-GIL P., SHAHBAZ T., MARSH T.R., GANSICKE B.T., STEEGHS D., LONG K.S., MARTINEZ-PAIS I.G., ARMAS PADILLA M., SCHWARZ R., SCHREIBER M.R., TORRES M.A.P., KOESTER D., DHILLON V.S., CASTELLANO J. and RODRIGUEZ D.

Abstract (from CDS):

We present the first dynamical determination of the binary parameters of an eclipsing SW Sextantis star in the 3-4h 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 30000±5000K. 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.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): binaries: close - stars: fundamental parameters - stars: individual: HS 0220+0603 - novae, cataclysmic variables

Simbad objects: 19

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2021.10.23-16:03:25

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