SIMBAD references

2011A&A...526A..29H - Astronomy and Astrophysics, volume 526A, 29-29 (2011/2-1)

Orbital and physical parameters of eclipsing binaries from the All-Sky Automated Survey catalogue. II. Two spotted M < 1 M systems at different evolutionary stages.


Abstract (from CDS):

We present the results of our detailed spectroscopic and photometric analysis of two previously unknown <1M detached eclipsing binaries: ASAS J045304-0700.4 and ASAS J082552-1622.8. With the HIgh Resolution Echelle Spectrometer (HIRES) on the Keck-I telescope, we obtained spectra of both objects covering large fractions of orbits of the systems. We also obtained V and I band photometry with the 1.0-m Elizabeth telescope of the South African Astronomical Observatory (SAAO). The orbital and physical parameters of the systems were derived with the PHOEBE and JKTEBOP codes. We investigated the evolutionary status of both binaries with several sets of widely-used isochrones. Our modelling indicates that (1) ASAS J045304-0700.4 is an old, metal-poor, active system with component masses of M1=0.8338±0.0036M, M2=0.8280±0.0040M and radii of R1=0.848±0.005R and R2=0.833±0.005R, which places it at the end of the Main Sequence evolution - a stage rarely observed for this type of stars. (2) ASAS J082552-1622.8 is a metal-rich, active binary with component masses of M1=0.7029±0.0045M, M2=0.6872±0.0049M and radii of R1=0.694 +0.007–0.011R and R2=0.699 +0.011–0.014R. Both systems show significant out-of-eclipse variations, probably owing to large, cold spots. We also investigated the influence of a third light in the second system.

Abstract Copyright:

Journal keyword(s): binaries: eclipsing - binaries: spectroscopic - stars: fundamental parameters - stars: individual: ASAS J045304-0700.4 - stars: late-type - stars: individual: ASAS J082552-1622.8

VizieR on-line data: <Available at CDS (J/A+A/526/A29): asas04_i.dat asas04_v.dat asas08_i.dat asas08_v.dat>

Simbad objects: 20

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