SIMBAD references

2007AJ....134..179Y - Astron. J., 134, 179-184 (2007/July-0)

Orbital period changes for the weak-contact binary TY Bootis.

YANG Y.-G., DAI J.-M., YIN X.-G. and XIANG F.-Y.

Abstract (from CDS):

We present a detailed period analysis of TY Bootis, based on all available light minimum times covering about 80 years. We discovered that there exists a cyclic variation overlaying a secular period decrease from the distorted (O-C) diagram. A long-term decrease with a sinusoidal oscillation (i.e., \formref eq. [2]) or with a light-time effect (i.e., \formref eq. [3]) may be reasonable due to the smaller difference between their sum of residuals. The sinusoidal change with a period of 59.7 yr for \formref equation (2) can be attributed to either a light-time effect or cyclic magnetic activity of both components. For the assumed third body, the period and eccentricity of the light-time orbit are P3=58.6 yr and e'=0.1744, respectively. If the existence of an additional unseen body is true, this binary may be a tertiary system. The long-term orbital period decrease suggests that TY Boo is undergoing a mass transfer from the primary component to the secondary component at a rate of dm/dt=-3.15x10–8 M/yr for \formref equation (2) or dm/dt=-2.90x10–8 M/yr for \formref equation (3). As its mass transfers, accompanied by angular momentum loss due to mass outflow L2, this binary will evolve into a deep contact configuration.

Abstract Copyright:

Journal keyword(s): Stars: Binaries: Close - Stars: Binaries: Eclipsing - Stars: Evolution - Stars: Individual: Constellation Name: TY Bootis

VizieR on-line data: <Available at CDS (J/AJ/134/179): table1.dat refs.dat>

CDS comments: Comparison and check stars are GSC 02568-00991 and GSC 02568-00997 (not 2658-0991 and 2658-0997).

Simbad objects: 10

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