Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...341..306f&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 341, June 1, 1989, p. 306-311.
Astronomy and Astrophysics
Astrophysics
6
Hertzsprung-Russell Diagram, Main Sequence Stars, Stellar Evolution, Stellar Luminosity, Stellar Mass, Stellar Mass Accretion, Entropy, Kinetic Energy, Photosphere
Scientific paper
The structural response of a low-mass (0.75 solar mass) main-sequence star to mass accretion is examined, assuming that matter is added onto the star with the same entropy as at the photosphere. Calculations show that the accreting star passes through a brief phase of underluminosity and subradius after the onset of accretion. This phase is followed by a sudden increase in luminosity rates and radius. These phases are characterized by a surface convective zone which first absorbs most of the heat liberated during accretion and then retreats and dies away. During the underluminosity and subradius phase, the star grows in mass without expanding very much and returns to the main-sequence state. If accretion is terminated while surface convection persists, the star flares, convection recedes and the star cools down.
Fujimoto Masayuki Y.
Iben Icko Jr.
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