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Properties of dwarf stars in Cygnus OB2

We present the results of investigation of five stars, originally classified as dwarfs, belonging to Cyg OB2 association, their stellar and wind properties. Using both TLUSTY and CMFGEN codes we derived effective temperatures, surface gravities, chemical abundances, mass-loss rates and projected rotation velocities. Due to the fact that distance to the stars is well known, we were able to estimate their luminosities. Using evolutionary models we estimated the ages of these sample stars and find that lower mass ones - MT282 and MT343 - belong to older population of the association. Their ages are greater than 10 Myr. The ages of three other stars - MT317, MT299, MT259 - are between 4-6 Myr.

preprint2015arXivOpen access
O. V. MaryevaS. Yu. ParfenovM. V. YushkinA. S. ShapovalovaS. Yu. Gorda
astro-ph.GAastro-ph.SR
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O. V. MaryevaS. Yu. ParfenovM. V. YushkinA. S. ShapovalovaS. Yu. Gorda

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