Resumen de Model atmosphere analysis of two new early-type O4 dwarfs stars

D.A. Fouda, M. Hamdy, M. Nouh, M. Beheary, Abdelaziz Bakrey, S. M. Saad

• 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.