The effect of close binary evolution on photoionization models for evolving starbursts

Details The effect of close binary evolution on photoionization models for evolving starbursts The effect of close binary evolution on photoionization models for evolving starbursts

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999newa....4..173v&link_type=abstract

New Astronomy, vol. 4, no. 3, p. 173-190.

Astronomy and Astrophysics

Astronomy

13

Binaries: Close, Blue Stragglers, Stars: Evolution, Galaxies: Starburst, Hii Regions

Scientific paper

Using a population number synthesis code and detailed massive star evolutionary calculations, Van Bever & Vanbeveren (1998) investigated the effect of close binary evolution on the WR and O-type star population of starburst regions. It was concluded that the age determination based on O-type features of a starburst which is older than 4 million years could be erroneous if observations are interpreted from the point of view of single star evolution only. Most important is the formation of rejuvenated OB-type Blue Stragglers when significant matter lost by the binary primary during the Roche lobe overflow (RLOF), is accreted by the companion. The present paper illustrates the latter statement. We consider the most frequently used age determinators, i.e., the strength of the H_alpha and H_beta emission lines of starburst regions. We distinguish the effects of the OB-type Blue Stagglers, of WR single stars and of hydrogen deficient core helium burning binary components in the post-RLOF phase of evolution (including the WR binary components) and the effects of X-radiation produced in standard high mass X-ray binaries.

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