Physics
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...342..940b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 342, July 15, 1989, p. 940-944. Research supported by NSF, Robert A. Welch
Physics
11
Stellar Envelopes, Stellar Evolution, Stellar Interiors, Stellar Mass, Supernova 1987A, Stellar Luminosity, Stellar Models, Stellar Physics
Scientific paper
Stars of mass about 20 solar masses 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.
Barkat Zalman
Wheeler Justin C.
No associations
LandOfFree
SN 1987A - Was Sanduleak -69 deg 202 mixed up? does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with SN 1987A - Was Sanduleak -69 deg 202 mixed up?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and SN 1987A - Was Sanduleak -69 deg 202 mixed up? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1703774