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Overview of Oscillating Binaries. —— Several Observational Aspects. Aiying ZHOU 周 爱 英. National Astronomical Observatories, CAS. 2010.03.31 Beijing. Light variations seems universal & much interesting. Every star varies !. RRab. What are the Most Interesting Light Curves?. Puls. (A). - PowerPoint PPT Presentation
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Aiying ZHOU 周 爱 英
2010.03.31 Beijing
National Astronomical Observatories, CAS
—— Several Observational Aspects
LC for the parent star of
CoRoT-exo-2b, 1.4RJ, 3.5MJ, 140d, ±0m.00016
78 transitsPorb =1d.74
Solar-like oscillation
Interests in such studies If no mechanism damping pulsations in close
binaries, percentage of pulsating stars expected among A-F components of detached & semi-detached eclipsing binaries should be at least the same as for single A-F type stars.
Pulsation characteristics of such systems are similar to those of single pulsators, but their evolutions are quite different due to mass accretion.
Advantages in such studies
Possibility of precise mass and radius determinations Possibility of mode identification during the eclipse o
rbital phases using the observed pulsational amplitude and phase changes (Nather & Robinson 1974, ApJ, 190, 637).
Precise estimation of the accretion rate using the pulsation period changes of the gainer/accreting star caused by accretion.
…… Ref.: 1. Aerts et al. 2004, ASP Conf. Ser. 318, 325
2. Lampens P. 2006, ASP Conf. Ser. 349, 153
The A-F spectral type, mass-accreting, main-sequence pulsating stars in semi-detached Algol-type eclipsing binary systems, i.e. oscillating EA (oEA)
They cataloged:
25 DCST-type oEA:
20 semidetached +4 detached +1 unclassified
90 semidetached + 71 detached + 36 from Hipparcos
in theδScuti region of H-R diagram.
In summary, > 72, DSCT–type oEA
> 100, All kinds, oscillating E. B.
> 420, various binary/multiple stellar systems with Puls. Comp.
Interesting works
How can binarity modify the pulsational properties? In what manner?
How can binarity/multiplicity help to identify the pulsation modes?
Search for pulsating M,K giants and subgaint stars in E. B.
Search for extra-solar planets around a pulsator. Search for extragalactic E. B. with Puls. Comp. Search for RR in E. B.