The spectroscopic variability of Teff and logg in the hot pulsating star βCephei

Details The spectroscopic variability of Teff and logg in the hot pulsating star βCephei The spectroscopic variability of Teff and logg in the hot pulsating star βCephei

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008mnras.389.1414c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 389, Issue 3, pp. 1414-1418.

Astronomy and Astrophysics

Astronomy

2

Stars: Abundances, Stars: Early-Type, Stars: Individual: Βcephei, Stars: Oscillations

Scientific paper

Time resolved spectra of βCep yield the following average results: Teff = 24000 +/- 250 K, logg = 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 Δlogg ~ 0.2 dex are found from Hβ. The metal lines give similar amplitudes but centred on Teff ~ 25000 K. An upper limit of 1.0 km s-1 to the variability of the microturbulence is derived from the SiIII 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.

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