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2008MNRAS.385.2061D - Mon. Not. R. Astron. Soc., 385, 2061-2068 (2008/April-3)
The two hybrid B-type pulsators: ν Eridani and 12 Lacertae.
DZIEMBOWSKI W.A. and PAMYATNYKH A.A.
Abstract (from CDS):
We use both the opacity project (OP) and opacity library Livermore (OPAL) opacity data and find significant difference in the results. Uncertainty in these data remains a major obstacle in precise modelling of the objects and, in particular, in estimating the overshooting distance. We find evidence for significant rotation rate increase between envelope and core in the two stars.
Instability of low-frequency g modes was found in seismic models of ν Eri built with the OP data, but at frequencies higher than those measured in the star. No such instability was found in models of 12 Lac. We do not yet have a satisfactory explanation for the low-frequency modes. Some enhancement of opacity in the driving zone is required but we argue that it cannot be achieved by the iron accumulation, as it has been proposed.
Abstract Copyright: ©2008 The Authors. Journal compilation © 2008 RAS
Journal keyword(s): stars: early-type - stars: individual: ν Eridani - stars: individual: 12 Lacertae - stars: oscillations - stars: rotation - stars: variables: other
Simbad objects: 7
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