A pulsating star inside η Carinae. II. The variability of the pulsation period.

Details A pulsating star inside η Carinae. II. The variability of the pulsation period. A pulsating star inside η Carinae. II. The variability of the pulsation period.

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26as..116....9s&link_type=abstract

Astronomy and Astrophysics Supplement, v.116, p.9-14

Astronomy and Astrophysics

Astrophysics

21

Stars: Individual: {Eta} Car, Stars: Variables, Stars: Oscillations, Stars: Supergiants

Scientific paper

On the basis of photometric observations published since 1974, we present new times of maximum light of the LBV η Car, and discuss the variation of the pulsation period. It is shown that -over more than two decades- the pulsation period is stable at 58.d58 with a mean error of about half an hour. η Car is the first LBV for which such a stable pulsation period can be recognised. In addition, we present evidence for the possible presence of a secondary period which beats with the main period on a time scale of the order of 20 years.

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