Aiying ZHOU 周爱英 2010.03.31 Beijing National Astronomical Observatories, CAS —— Several Observational Aspects.

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Presentation transcript:

Aiying ZHOU 周爱英 Beijing National Astronomical Observatories, CAS —— Several Observational Aspects

Every star varies ！ Light variations seems universal & much interesting

RRab

What are the Most Interesting Light Curves?

Orbital motion Puls. (A)

LC for the parent star of CoRoT-exo-2b, 1.4R J, 3.5M J, 140 d, ± 0 m transits P orb =1 d.74 Solar-like oscillation

Eclipsing Binaries with Pulsating Components

Interests in such studies If no mechanism damping pulsations in close binaries, percentage of pulsating stars expected among A-F components of detached & semidetached 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 orbital 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, Lampens P. 2006, ASP Conf. Ser. 349, 153

δScuti in an Algol-type binary (oEA): AB Cas Orbital motion Puls. (A)

The A-F spectral type, mass-accreting, main-sequence pulsating stars in semidetached 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.

How many now ?

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.

Summary Why Statistics Furture works

This talk is based on Zhou A.-Y., 2010, arXiv: (to be updated)