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dc.contributor.authorKawka, Adéla
dc.contributor.authorVennes, Stéphane
dc.contributor.authorNémeth, Péter
dc.contributor.authorKraus, Michaela
dc.contributor.authorKubát, Jiří
dc.date.accessioned2015-04-02T18:23:32Z
dc.date.available2015-04-02T18:23:32Z
dc.date.issued2010
dc.identifier.citationKawka, A., Vennes, S., Németh, P., Kraus, M., & Kubát, J. (2010). Two new hot subdwarf binaries in the GALEX survey. Monthly Notices of the Royal Astronomical Society, 408(2), 992-998.en_US
dc.identifier.urihttp://hdl.handle.net/11141/526
dc.description.abstractWe report the discovery of two new hot, hydrogen-rich subdwarfs (sdB) in close binary systems. The hot subdwarfs, GALEX J0321+4727 and GALEX J2349+3844, were selected from a joint optical-ultraviolet catalogue of hot subluminous stars based on GSC2.3.2 and the Galaxy Evolution Explorer all-sky survey. Using high-dispersion spectra of the Hα core, obtained using the 2-m telescope at Ondřejov Observatory, we measured the radial velocities of the sdB primaries and determined orbital periods of 0.265 84 ± 0.000 04 d and 0.462 49 ± 0.000 07 d for GALEX J0321+4727 and GALEX J2349+3844, respectively. The time series obtained from the Northern Sky Variability Survey with an effective wavelength near the R-band show that GALEX J0321+4727 is a variable star (Δm= 0.12 mag), while no significant variations are observed in GALEX J2349+3844. The period of variations in GALEX J0321+4727 coincides with the orbital period and the variability is probably caused by a reflection effect on a late-type secondary star. Lack of photometric variations in GALEX J2349+3844 probably indicates that the companion is a white dwarf star. Using all available photometry and spectroscopy, we measured the atmospheric properties of the two sdB stars and placed limits on the mass and luminosity of the companion stars.en_US
dc.language.isoen_USen_US
dc.rightsThis published article is available in accordance with the publisher's policy. It may be subject to U.S. Copyright Law. This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2010 to the authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.en_US
dc.rights.urihttp://www.oxfordjournals.org/en/access-purchase/rights-and-permissions/publication-rights.htmlen_US
dc.titleTwo new hot subdwarf binaries in the GALEX surveyen_US
dc.typeArticleen_US
dc.identifier.doi10.1111/j.1365-2966.2010.17165.x


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