Bibcode
Desmet, M.; Briquet, M.; Thoul, A.; Zima, W.; De Cat, P.; Handler, G.; Ilyin, I.; Kambe, E.; Krzesinski, J.; Lehmann, H.; Masuda, S.; Mathias, P.; Mkrtichian, D. E.; Telting, J.; Uytterhoeven, K.; Yang, S. L. S.; Aerts, C.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 396, Issue 3, pp. 1460-1472.
Advertised on:
7
2009
Citations
40
Refereed citations
33
Description
We present the results of a spectroscopic multisite campaign for the
β Cephei star 12 (DD) Lacertae. Our study is based on more than
thousand high-resolution high S/N spectra gathered with eight 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 slowly pulsating B-stars
(SPB)-like g-mode with frequency 0.3428d-1 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 = 5.178964d-1,
f2 = 5.334224d-1, f3 =
5.066316d-1 and f4 = 5.490133d-1,
respectively. Our seismic modelling shows that f2 is likely
the radial first overtone and that the core overshooting parameter
αov is lower than 0.4 local pressure scale heights.
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