کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1779197 | 1523759 | 2013 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Physical parameters and chemical abundances of δδ Ceti Physical parameters and chemical abundances of δδ Ceti](/preview/png/1779197.png)
A detailed spectroscopic study of a ββ Cephei variable star, δδ Ceti, is presented. Physical fundamental parameters are estimated from the best fitting of 26 neutral helium lines and Balmer profiles: effective temperature, superficial gravity and projected rotation velocity. Non-LTE abundances of He, C, N, O, Ne, Mg, Al, Si, P, S, Ar and Fe are achieved using model atmospheres with updated atomic data. Our analysis show an N-enrichment and Fe overabundance, with [O/Fe]≅≅ −0.73 dex, confirming this object to be a metal-rich star, which is a requirement for the κκ-mechanism to trigger the pulsations observed in ββ Cephei stars.
► We present medium resolution spectroscopic observations made at ESO/La Silla.
► Physical parameters of the photosphere and chemical abundances were performed.
► Results show an N-enrichment and Fe overabundance with [O/Fe] = −0.73 dex.
Journal: New Astronomy - Volume 18, January 2013, Pages 55–61