Amplitude monitoring of the β Cephei star 16 Lacertae.

Details Amplitude monitoring of the β Cephei star 16 Lacertae. Amplitude monitoring of the β Cephei star 16 Lacertae.

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...321..145s&link_type=abstract

Astronomy and Astrophysics, v.321, p.145-150

Astronomy and Astrophysics

Astrophysics

8

Stars: Individual: 16 Lac, Stars: Variable, Stars: Binaries: Close, Stars: Oscillations

Scientific paper

Based on new observations, it is shown here that the amplitude of one of the three well known and stable short periods in the β Cep variable 16 Lac has changed: while the radial mode P_1_=0.16917d is near its lower amplitude level and the amplitude variation of the non-radial mode P_3_=0.18173d is still probably in phase with the orbital period, the amplitude of the NR mode P_2_=0.17077d has increased progressively by a factor two in the last ten years. The observed phase of P_2_ shows that at least for this period, the previous ephemeris is no longer valid. Various hypotheses are proposed to account for the observed amplitudes variations.

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