BS Lyrae: a double mode Mira star with a dominant first overtone mode.

Details BS Lyrae: a double mode Mira star with a dominant first overtone mode. BS Lyrae: a double mode Mira star with a dominant first overtone mode.

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...315..481m&link_type=abstract

Astronomy and Astrophysics, v.315, p.481-484

Astronomy and Astrophysics

Astrophysics

4

Data Analysis, Stars: Agb: Post-Agb, Stars: Individual: Bs Lyr, Stars: Oscillations

Scientific paper

The frequency analysis of the photographic B light curve of the Mira star BS Lyr reveals besides the dominant period (P_1_=304.7d) the unambiguous presence of a second one with P_2_=272.3d. The analysis shows also the presence of the non-linear coupling terms between the two periodicities (1/P_1_+1/P_2_ and 1/P_2_-1/P_1_). The ratio between the two periods P_1_/P_2_=1.119+/-0.005 indicates that the two modes are the first (P_1_) and the second (P_2_) radial overtones. A third periodicity with P=179d could be also present, even if it is only marginally significant. It could correspond to the third overtone mode.

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