Model atmosphere analysis of two new early–type O4 dwarfs stars

Applied Mathematics and Nonlinear Sciences

Beheary M.¹  Bakrey Abdelaziz¹  Saad S. M.²  Nouh M.²  Hamdy M.²  Fouda D.A.² 

[1] Department of Astronomy and Meteorology, Faculty of Science, El Azhar University, Cairo, Egypt;National Research Institute of Astronomy and Geophysics (NRIAG), Department of Astronomy, Stellar Lab. Helwan 11421, Cairo. Egypt;

关键词: stars: early-type;    stars: dwarfs stars: model atmosphere;    stars: physical parameters;    85a04;    70f15;   

DOI  :  10.21042/AMNS.2017.2.00046

来源: DOAJ

【 摘 要 】

We present a synthetic spectra study of two new galactic early-type O4 dwarf stars(ALS 19618 and BD+50886) with high signal-to-noise ratio, typically S/N ∼ 300, medium-rosalution R ∼ 2500 optical spectra of O4 dwarfs stars from Galactic O-Stars Spectroscopic Survey (GOSSS), The main stellar parameters (Teff, surface gravity, rotational velocity) have been established using non-LTE, line-blanketed, atmospheric models calculated by TLUSTY204 and SYNSPEC49.

【 授权许可】

Unknown