How Evolved are the Mass Donor Stars in Cataclysmic Variables? | Zendy

Steve B. Howell | Zendy

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How Evolved are the Mass Donor Stars in Cataclysmic Variables?

Author(s) -

Steve B. Howell

Publication year - 2001

Publication title -

publications of the astronomical society of japan

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.99

H-Index - 110

eISSN - 2053-051X

pISSN - 0004-6264

DOI - 10.1093/pasj/53.4.675

Subject(s) - physics , astrophysics , ejecta , stars , solar mass , cataclysmic variable star , astronomy , nova (rocket) , stellar evolution , main sequence , white dwarf , supernova , aeronautics , engineering

Recent spectroscopic observations have identified several cataclysmicvariables non-solar metal abundances. We present theoretical models whichexamine the level of core evolution expected for CV secondaries prior tocontact. Our results indicate that few secondary stars evolve past 10% of theirmain sequence lifetime prior to the initiation of mass transfer; a result whichis in agreement with present day observations. Thus, the non-solar metalabundances observed must be due to nuclear burning by-products accreted by thesecondary star during common envelope sweeping prior to initial contact orejecta collected during classical nova outbursts.Comment: To Appear in PAS

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