SN 1987A - The evolution from red to blue

Details SN 1987A - The evolution from red to blue SN 1987A - The evolution from red to blue

Nov 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...346..417t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 346, Nov. 1, 1989, p. 417-423. Research supported by NSF, Robert A. Welch F

Astronomy and Astrophysics

Astrophysics

9

Stellar Evolution, Supergiant Stars, Supernova 1987A, Blue Stars, Helium, Hertzsprung-Russell Diagram, Red Giant Stars, Stellar Cores, Stellar Mass

Scientific paper

Envelope models in thermal and dynamic equilibrium are used to explore the nature of the transition of SK -69 deg 202, the progenitor of SN 1987A, from the Hayashi track to its final blue position in the H-R diagram. Loci of possible thermal equilibrium solutions are presented as a function of Teff and M(C/O), the mass of the carbon/oxygen core interior to the helium burning shell. It is found that uniform helium enrichment of the envelope results in red-blue evolution but that the resulting blue solution is much hotter than SK -69 deg 202. Solutions in which the only change is to redistribute the portion of the envelope enriched in helium during main-sequence convective core contraction into a step function with Y of about 0.5 at a mass cut of about 10 solar masses give a natural transition from red to blue and a final value of Teff in agreement with observations. It is argued that SK -69 deg 202 probably fell on a post-Hayashi track sequence at moderate Teff. The possible connection of this sequence to the step distribution in the H-R diagram of the LMC.

Affiliated with

Also associated with

No associations

Rating

SN 1987A - The evolution from red to blue 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 - The evolution from red to blue, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and SN 1987A - The evolution from red to blue will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1613612