MULTIPHASE SPECTROSCOPIC OBSERVATIONS OF THE LONG-PERIOD CEPHEIDS l CARINAE
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Дата
2013
Науковий керівник
Укладач
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Видавець
Astroprint
Анотація
Thirty three spectra (one spectrum for the each of 33 observational nights) have been performed to cover all pulsational period of the 35.5-days Cepheid l Car. Due to these data we have obtained for the first time the detailed curves of effective temperature, gravity and turbulent velocity. Curves
of gravity and turbulent velocity show complicated changes, connceted probably with dynamics of extensive Cepheid’s atmosphere. The mean atmosphere parameters of l Car are: Teff = 4984 15 K; log g = 1.13; Vt = 6.67 km s−1. Having a solar metallicity [Fe/H] = +0.02 dex, this Cepheid demonstrate sudden results for the ”key” elements abundances of yellow
supergiants evolution, – all they are close to the solar ones. In this case l Car resembles to SV Vul, – Cepheid with 45-days pulsational period and nearly like spectral type. It is possible that l Car is an object
crossing the Cepheids instability strip for the first time. The content of other elements is close to solar one too.
Опис
Odessa Astronomical publications / Одесская астроном. обсерватория . – Одесса : Астропринт, 2013 . – Vol.26/1.
Ключові слова
Stars, Cepheids stars, individual, l Car
Бібліографічний опис
Odessa Astronomical Publications