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2006MNRAS.369..171S - Mon. Not. R. Astron. Soc., 369, 171-181 (2006/June-2)
Photometric studies of three multiperiodic β Cephei stars: β CMa, 15 CMa and KZ Mus.
SHOBBROOK R.R., HANDLER G., LORENZ D. and MOGOROSI D.
Abstract (from CDS):
Mode identification by means of the amplitude ratios in the different passbands suggests one radial mode for each star. In addition, β CMa has a dominant ℓ = 2 mode while its third mode is non-radial with unknown ℓ. The non-radial modes of 15 CMa, which are ℓ ≤ 3, form an almost equally split triplet that, if physical, would imply that we see the star under an inclination angle larger than 55°. The strongest non-radial mode of KZ Mus is ℓ = 2, followed by the radial mode and a dipole mode. Its weakest known mode is non-radial with unknown ℓ, confirming previous mode identifications for the pulsations of the star.
The phased light curve for the strongest mode of 15 CMa has a descending branch steeper than the rising branch. A stillstand phenomenon during the rise to maximum light is indicated. Given the low photometric amplitude of this non-radial mode this is at first sight surprising, but it can be explained by the aspect angle of the mode.
Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS
Journal keyword(s): stars: early-type - stars: individual: β CMa - stars: individual: 15 CMa - stars: individual: KZ Mus - stars: oscillations - stars: variables: other
Simbad objects: 14
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