Journal Article

The spectroscopic variability of <i>T</i><sub>eff</sub> and log <i>g</i> in the hot pulsating star β Cephei

G. Catanzaro and F. Leone

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 389, issue 3, pages 1414-1418
Published in print September 2008 | ISSN: 0035-8711
Published online September 2008 | e-ISSN: 1365-2966 | DOI:
The spectroscopic variability of Teff and log g in the hot pulsating star β Cephei

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Time resolved spectra of β Cep yield the following average results: Teff= 24 000 ± 250 K, log g= 3.91 ± 0.05 and ξ= 8.1 ± 0.9 km s−1. Nitrogen, oxygen, neon, aluminium, silicon and sulfur abundances are solar while carbon, magnesium and iron are slightly underabundant. Pulsational amplitudes of ΔTeff∼ 700 K and Δlog g∼ 0.2 dex are found from Hβ. The metal lines give similar amplitudes but centred on Teff∼ 25 000 K. An upper limit of 1.0 km s−1 to the variability of the microturbulence is derived from the Si iii triplet at 455 nm. The radial-velocity amplitude derived from the core of Hβ is ∼15 per cent greater than that from the metal lines.

Keywords: stars: abundances; stars: early-type; stars: individual: β Cephei; stars: oscillations

Journal Article.  3107 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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