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- W2073655360 abstract "view Abstract Citations (15) References (14) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS SN 1987A: Was Sanduleak -69 degrees 202 Mixed Up? Barkat, Zalman ; Wheeler, J. Craig Abstract Stars of mass ~ 20 M_sun_ with luminosity and effective temperature in the range observed for SK -69^deg^202, the progenitor of SN 1987A, have a convective zone near the base of the hydrogen-rich envelope. The extent and efficiency of this convective zone are functions of the core and envelope mass, the envelope composition, the luminosity, and the effective temperature. A parameter study is used to establish the conditions under which this convective zone can penetrate the composition barrier at the helium core boundary. For given L, T_eff_, and M there is a critical core mass below which core penetration and substantial mixing will occur. This critical core mass is only a few tenths of a solar mass less than the core masses derived in standard evolutionary models. Overshooting (downward) in the convective zone or enhancement of the envelope mass by transfer from a companion could lead naturally to such mixing. Such core penetration will enrich the envelope in helium and nitrogen and might substantially alter the subsequent evolution. Publication: The Astrophysical Journal Pub Date: July 1989 DOI: 10.1086/167650 Bibcode: 1989ApJ...342..940B Keywords: Stellar Envelopes; Stellar Evolution; Stellar Interiors; Stellar Mass; Supernova 1987a; Stellar Luminosity; Stellar Models; Stellar Physics; Astrophysics; CONVECTION; STARS: INDIVIDUAL ALPHANUMERIC: SN 1987A; STARS: INTERIORS; STARS: SUPERNOVAE full text sources ADS | data products NED (2) SIMBAD (1)" @default.
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- W2073655360 date "1989-07-01" @default.
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- W2073655360 title "SN 1987A - Was Sanduleak -69 deg 202 mixed up?" @default.
- W2073655360 doi "https://doi.org/10.1086/167650" @default.
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