2013/09/17 by Olga Maryeva, Maryeva, Olga, В. Г. Клочкова +5
Chemistry · Earth and Planetary Sciences · Physics and Astronomy · #Atmospheric Ozone and Climate #Spectroscopy and Laser Applications #Stellar, planetary, and galactic studies #astro-ph.SR
paper · pdf · doi:10.48550/arxiv.1309.4495
proceedings of conference "Massive Stars: From α to Ω", held 10-14 June 2013 in Rhodes, Greece; Online at http://a2omega-conference.net, id.84
arxiv created 2013/09/17 · arxiv updated 2013/09/19
We present the results of modeling of the spectrum of the brightest stars belonging to the Cyg OB2 association - #7 (O3If*) and #11 (O5Ifc). #7 is one of the hottest stars in our Galaxy, while #11 belongs to the spectral class Ofc, which was recently introduced and yet small in numbers (Walborn et al., 2010). We determine the physical properties and chemical composition of their atmosphere using CMFGEN code. The atmosphere of #7 reveals an excess of nitrogen X(N*)/X(Nsun) = 3.2 and the carbon and oxygen deficiency X(C*)/X(Csun) = 0.08, X(O*)/X(Osun) = 0.09, while the atmosphere of #11 is enriched with carbon X(C*)/X(Csun)=1 and silicon X(Si *)/X(Si sun)=2.