The Library
Dynamical masses of a nova-like variable on the edge of the period gap
Tools
Tools
Tools
Rodríguez-Gil, P., Shahbaz, T., Marsh, Tom, Gänsicke, B. T. (Boris 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. and Rodríguez, D. (2015) Dynamical masses of a nova-like variable on the edge of the period gap. Monthly Notices of the Royal Astronomical Society, 452 (1). pp. 146-157. doi:10.1093/mnras/stv1244 ISSN 0035-8711.
Research output not available from this repository.
Request-a-Copy directly from author or use local Library Get it For Me service.
Official URL: http://dx.doi.org/10.1093/mnras/stv1244
Abstract
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.
| Item Type: | Journal Article | ||||||
|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||
| Publisher: | Oxford University Press | ||||||
| ISSN: | 0035-8711 | ||||||
| Official Date: | 1 September 2015 | ||||||
| Dates: |
|
||||||
| Volume: | 452 | ||||||
| Number: | 1 | ||||||
| Page Range: | pp. 146-157 | ||||||
| DOI: | 10.1093/mnras/stv1244 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Restricted or Subscription Access |
Request changes or add full text files to a record
Repository staff actions (login required)
 |
View Item |
