The pre-cataclysmic variable, LTT560

Abstract

System parameters of the object LTT560 are determined in order to clarify its nature and evolutionary status. We apply time-series photometry to reveal orbital modulations of the light curve, time-series spectroscopy to measure radial velocities of features from both the primary and the secondary star, and flux-calibrated spectroscopy to derive temperatures of both components. We find that LTT560 is composed of a low temperature T~7500K DA white dwarf as the primary and an M5.5+-1 main-sequence star as the secondary component. The current orbital period is Porb=3.54(07)h. We derive a mass ratio Msec/Mwd = 0.36(03) and estimate the distance to d=25-40pc. Long-term variation of the orbital light curve and an additional H-alpha emission component on the white dwarf indicate activity in the system, probably in the form of flaring and/or accretion events.

Accepted for publication in A&A

References in corpus (3)

• Low-Mass Dwarf Template Spectra from the Sloan Digital Sky Survey
• The mass and radius of the M-dwarf in the short period eclipsing binary RR Caeli
• An alternative to common envelope evolution

Cited by in corpus (4)

• Post Common Envelope Binaries from SDSS. V: Four eclipsing white dwarf main sequence binaries
• Post Common Envelope Binaries from SDSS - III. Seven new orbital periods
• Post common envelope binaries from SDSS. II: Identification of 9 close binaries with VLT/FORS2
• Post common envelope binaries from SDSS. IV: SDSSJ121258.25-012310.1, a new eclipsing system