The evolutionary status of the most massive WNh stars in close binary systems. NGC 3603-A1

Details The evolutionary status of the most massive WNh stars in close binary systems. NGC 3603-A1 The evolutionary status of the most massive WNh stars in close binary systems. NGC 3603-A1

Mar 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011arep...55..247t&link_type=abstract

Astronomy Reports, Volume 55, Issue 3, pp.247-255

Astronomy and Astrophysics

Astronomy

Scientific paper

The evolution of the components of the unique, massive, close binary system NGC 3603-A1, which consists of stars of spectral types WN6ha and WN6h, is analyzed. The component masses are estimated to be 116 and 89 M &sun;, close to the highest measured stellar masses. Numerical modeling of the evolution of the components has been carried out, taking into account mass loss via the stellar winds of the two massive stars. It is shown that the maximum possible initial component masses are close to 140 and 125 M &sun;. The components are currently slightly evolved main-sequence stars, with a comparative low degree of helium enrichment at their surfaces. Further evolution of the system will lead to filling of the Roche lobe of the primary and subsequent evolution in a common envelope. This may lead to the merger of the components, with the evolution of the system ending in the formation of a singlemassive black hole after the second supernova explosion. Otherwise, depending on the masses of the resulting black holes, either a binary system of two black holes or two unbound black holes may form, accompanied by gamma-ray bursts.

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