Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...138..443b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 138, no. 2, Sept. 1984, p. 443-450. Research supported by the Consiglio Nazion
Astronomy and Astrophysics
Astrophysics
10
Eclipsing Binary Stars, Pulsars, Stellar Spectrophotometry, Angular Velocity, Orbital Elements, Roche Limit, Stellar Oscillations, Ubv Spectra
Scientific paper
On the basis of new B and V observations the large variation in the orbital period of the eclipsing system Y Cam is studied along an interval over ninety years. An explanation of the minimum time residuals in terms of a third or a fourth body is discussed. Photometric solutions are calculated according to the Roche model. Multiperiod analysis of the Delta Scuti-type primary component of the binary system gives a period ratio of 0.97 which is consistent with non-radial pulsations. This ratio moreover seems to conform to the linear relation between rotational velocity and period ratio proposed for non-radial pulsators. The oscillation with larger amplitude has a period constant over an interval of at least 120,000 cycles.
Broglia Pietro
Conconi Paolo
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