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Seismic modelling of the $\beta\,$Cep star EN (16) Lacertae

Authors :
Thoul, A.
Aerts, C.
Dupret, M. A.
Scuflaire, R.
Korotin, S. A.
Egorova, I. A.
Andrievsky, S. M.
Lehmann, H.
Briquet, M.
De Ridder, J.
Noels, A.
Thoul, A.
Aerts, C.
Dupret, M. A.
Scuflaire, R.
Korotin, S. A.
Egorova, I. A.
Andrievsky, S. M.
Lehmann, H.
Briquet, M.
De Ridder, J.
Noels, A.
Source :
Astronomy and Astrophysics; July 2003, Vol. 406 Issue: 1 p287-292, 6p
Publication Year :
2003

Abstract

We perform seismic modelling of the massive $\beta\,$Cep star EN Lacertae. The starting point of our analysis is the spectroscopic mode identification recently performed. To this, we add a new updated photometric mode identification based upon a non-adiabatic description of the eigenfunctions in the outer atmosphere. Both mode identifications agree and this allows us to fine-tune the stellar parameters of EN Lacertae with unprecedented precision. This is done by producing a huge amount of stellar models with different parameters and selecting those that fulfill the frequency values and the mode identification. Our study is the first one of its kind in which a reconcilation between observed pulsational characteristics and theoretical models can be achieved at a level that allows accurate determination of the basic stellar parameters of a massive oscillator. We derive a mass of $M=9.62\pm 0.11\,M_\odot$and an age of 15.7 million years if we assume that convective overshooting does not occur.

Details

Language :
English
ISSN :
00046361 and 14320746
Volume :
406
Issue :
1
Database :
Supplemental Index
Journal :
Astronomy and Astrophysics
Publication Type :
Periodical
Accession number :
ejs53225427
Full Text :
https://doi.org/10.1051/0004-6361:20030757