Membership of the WR binary system V444 Cygni in the young open cluster Berkeley 86

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Charge Coupled Devices, Open Clusters, Stellar Spectrophotometry, Ubv Spectra, Wolf-Rayet Stars, Color-Magnitude Diagram, Eclipsing Binary Stars, Molecular Clouds, Star Formation

Scientific paper

New UBV photometry and CCD spectroscopy of stars near Berkeley 86 are used to examine the possible cluster membership of the WN5 + O6 eclipsing binary system V444 Cygni. The color-magnitude diagram, star counts, reddening, and cluster age all suggest that the system is a probable member of this young (5 +/- 1 Myr), moderately reddened (E(B - V) = 0.8 - 1.2) open cluster. The assumption of cluster membership results in an estimate of (30-40) solar masses for the initial mass of the WR progenitor. The relationship of Be 86 to the surrounding Cyg OB1 association is also studied, and a working model is proposed in which several young clusters and other markers of relatively recent star formation lie at the edges of a molecular/dust cloud about 1-1.5 kpc from the sun.

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