Pulsation and binarity in Beta Cephei Stars. I - Sigma Scorpii

Details Pulsation and binarity in Beta Cephei Stars. I - Sigma Scorpii Pulsation and binarity in Beta Cephei Stars. I - Sigma Scorpii

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...257..587c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 257, no. 2, p. 587-593.

Astronomy and Astrophysics

Astrophysics

6

Binary Stars, Light Curve, Stellar Oscillations, Variable Stars, Astronomical Photometry, Astronomical Spectroscopy, Orbital Mechanics, Triple Stars

Scientific paper

All available spectroscopic data of the Beta Cephei star Sigma Sco were analyzed. The orbital period is found to be: P(orb) = 33.0114 d. Two short periods were present in the data: P1 = 0.246829 d and P2 = 0.239661 d, these two periods being variable. However, it was not possible to detect variation of the beat period that is exactly equal to one quarter of the orbital period. In view of this particular value of Pb, the absence of the wavelength dependence of the photometric amplitude for the period P2, and the dependence of amplitude and asymmetry of the light curve with orbital phase, we suggest that sigma Sco is pulsating in a single nonradial mode modulated by the orbital frequency of the binary system.

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