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2006MNRAS.365..327H - Mon. Not. R. Astron. Soc., 365, 327-338 (2006/January-1)
Asteroseismology of the β Cephei star 12 (DD) Lacertae: photometric observations, pulsational frequency analysis and mode identification.
HANDLER G., JERZYKIEWICZ M., RODRIGUEZ E., UYTTERHOEVEN K., AMADO P.J., DOROKHOVA T.N., DOROKHOV N.I., PORETTI E., SAREYAN J.-P., PARRAO L., LORENZ D., ZSUFFA D., DRUMMOND R., DASZYNSKA-DASZKIEWICZ J., VERHOELST T., DE RIDDER J., ACKE B., BOURGE P.-O., MOVCHAN A.I., GARRIDO R., PAPARO M., SAHIN T., ANTOCI V., UDOVICHENKO S.N., CSORBA K., CROWE R., BERKEY B., STEWART S., TERRY D., MKRTICHIAN D.E. and AERTS C.
Abstract (from CDS):
One of the periodic signals we detected in the light curves is argued to be a linearly stable mode excited to visible amplitude by non-linear mode coupling via a 2:1 resonance. We also find a low-frequency signal in the light variations whose physical nature is unclear; it could be a parent or daughter mode resonantly coupled. The remaining combination frequencies are consistent with simple light-curve distortions.
The range of excited pulsation frequencies of 12 Lac may be sufficiently large that it cannot be reproduced by standard models. We suspect that the star has a larger metal abundance in the pulsational driving zone, a hypothesis also capable of explaining the presence of β Cephei stars in the Large Magellanic Cloud.
Abstract Copyright: 2005 The Authors. Journal compilation © 2005 RAS
Journal keyword(s): techniques: photometric - stars: early-type - stars: individual: 12 (DD) Lacertae - stars: oscillations - stars: variables: other
Errata: erratum vol. 426, p. 2600 (2012)
Simbad objects: 13
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