An asteroseismic study of the beta Cephei star 12 Lacertae: multisite spectroscopic observations, mode identification and seismic modelling

Abstract

We present the results of a spectroscopic multisite campaign for the beta Cephei star 12 (DD) Lacertae. Our study is based on more than thousand high-resolution high S/N spectra gathered with 8 different telescopes in a time span of 11 months. In addition we make use of numerous archival spectroscopic measurements. We confirm 10 independent frequencies recently discovered from photometry, as well as harmonics and combination frequencies. In particular, the SPB-like g-mode with frequency 0.3428 1/d reported before is detected in our spectroscopy. We identify the four main modes as (l1,m1) = (1, 1), (l2,m2) = (0, 0), (l3,m3) = (1, 0) and (l4,m4) = (2, 1) for f1 = 5.178964 1/d, f2 = 5.334224 1/d, f3 = 5.066316 1/d and f4 = 5.490133 1/d, respectively. Our seismic modelling shows that f2 is likely the radial first overtone and that the core overshooting parameter alpha_ov is lower than 0.4 local pressure scale heights.

16 pages, 11 figures, accepted in MNRAS

References in corpus (9)

• CLES, Code Liegeois d'Evolution Stellaire
• An asteroseismic study of the beta Cephei star theta Ophiuchi: constraints on global stellar parameters and core overshooting
• The Liege Oscillation Code
• Abundance analysis of prime B-type targets for asteroseismology I. Nitrogen excess in slowly-rotating beta Cephei stars
• Instability strips of SPB and beta Cephei stars: the effect of the updated OP opacities and of the metal mixture
• The two hybrid B-type pulsators: Nu Eridani and 12 Lacertae
• A new method for the spectroscopic identification of stellar non-radial pulsation modes. I. The method and numerical tests
• An asteroseismic study of the beta Cephei star beta Canis Majoris
• delta Ceti is not monoperiodic: seismic modeling of a beta Cephei star from MOST spacebased photometry

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