SIMBAD references

2012MNRAS.423..478A - Mon. Not. R. Astron. Soc., 423, 478-485 (2012/June-2)

A photometric and spectroscopic study of NSVS 14256825: the second sdOB+dM eclipsing binary.


Abstract (from CDS):

We present an analysis of UBVRCICJH photometry and phase-resolved optical spectroscopy of NSVS 14256825, an HW Vir type binary. The members of this class consist of a hot subdwarf and a main-sequence low-mass star in a close orbit (Porb ∼ 0.1 d). Using the primary-eclipse timings, we refine the ephemeris for the system, which has an orbital period of 0.110 37 d. From the spectroscopic data analysis, we derive the effective temperature, T1= 40 000±500 K, the surface gravity, log g1= 5.50±0.05, and the helium abundance, ν(He)/ν(H) = 0.003± 0.001, for the hot component. Simultaneously modelling the photometric and spectroscopic data using the Wilson-Devinney code, we obtain the geometrical and physical parameters of NSVS 14256825. Using the fitted orbital inclination and mass ratio (i= 82°.5±0°.3 and q=M2/M1= 0.260±0.012, respectively), the components of the system have M1= 0.419±0.070 M, R1= 0.188±0.010 R, M2= 0.109±0.023 M and R2= 0.162±0.008 R. From its spectral characteristics, the hot star is classified as a subdwarf OB (sdOB) star.

Based on observations carried out at the Observatório do Pico dos Dias/Laboratório Nacional de Astrofìsica (OPD/LNA) in Brazil.

Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS

Journal keyword(s): binaries: eclipsing - stars: fundamental parameters - stars: individual: NSVS 14256825 - stars: low-mass - subdwarfs

Simbad objects: 13

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