Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010ap%26ss.328...87c&link_type=abstract
Astrophysics and Space Science, Volume 328, Issue 1-2, pp. 87-90
Astronomy and Astrophysics
Astrophysics
Scientific paper
This study is an exploratory search to ascertain for the first time the detailed properties of σ Cas as a candidate pulsator of β Cephei type in view of future observing campaigns. The suspected pulsational variability of the star has been studied by analyzing the line-profile variability of the two spectral lines He( i) λ 5875.6 Å and Si( iii) λ 4452.6 Å. The search for periodicity was performed by adopting the pixel-by-pixel method. In this study, we derived the effective temperature, the surface gravity, the luminosity and the radius. By means of evolutionary tracks and isochrones we derived also mass and age. The values obtained locate σ Cas with good confidence inside the β Cephei instability region. The line-profile variability analysis indicates a clear excess of oscillation power in the range 2-8 cycles d-1, with two prominent peaks at 3.00 and 5.32 cycles d-1, in the expected typical range of frequency of β Cephei pulsations.
Catanzaro Giovanni
Paterno' Lucio
Ventura Rodrigo
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