SIMBAD references

2006A&A...454..301F - Astronomy and Astrophysics, volume 454, 301-309 (2006/7-4)

Newly discovered active binaries in the RasTyc sample of stellar X-ray sources. I. Orbital and physical parameters of six new binaries.


Abstract (from CDS):

We present the first results from follow-up optical observations, both photometric and spectroscopic, of stellar X-ray sources, selected from the RasTyc sample, resulting from the cross-correlation of ROSAT All-Sky Survey (RASS) and TYCHO catalogues. In particular, we report on the discovery of six late-type binaries, for which we obtained good radial velocity curves and solved their orbits. We performed an automatic spectral classification of both single-lined and double-lined binaries with codes developed by us and found two binaries composed of two main-sequence stars and four binaries with an evolved (giant or subgiant) component. Filled-in or pure emission Hα profiles indicative of a moderate or high level of chromospheric activity were observed. In nearly all the systems, we also detected a photometric modulation ascribable to surface inhomogeneities that is correlated with the orbital period, suggesting a synchronization between rotational and orbital periods. The position on the HR diagram of the components of the five sources with a known parallax indicates three binaries containing only main-sequence stars and two single-lined systems with a giant component. The kinematical properties of two, or possibly four, of the observed systems are consistent with a young disk population.

Abstract Copyright:

Journal keyword(s): stars: binaries: spectroscopic - stars: fundamental parameters - stars: late-type - stars: activity - stars: kinematics - X-rays: stars

VizieR on-line data: <Available at CDS (J/A+A/454/301): table2.dat table3.dat table4.dat table5.dat table6.dat table7.dat tables.tex>

Simbad objects: 22

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