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Mass-loss varying luminosity and its implication to the solar evolution

Published online by Cambridge University Press:  29 January 2021

Negessa Tilahun Shukure ,
Solomon Belay Tessema  and
Endalkachew Mengistu
Negessa Tilahun Shukure
Affiliation:
Astronomy and Astrophysics Research and Development Division, Entoto Observatory and Research Center, Ethiopian Space Science and Technology Institute, P.O.Box 33679, Addis Ababa, Ethiopia Addis Ababa University, P.O.Box 1176, Addis Ababa, Ethiopia Dilla University, P.O.Box 419, Dilla, Ethiopia emails: [email protected]; [email protected]; [email protected]
Solomon Belay Tessema
Affiliation:
Astronomy and Astrophysics Research and Development Division, Entoto Observatory and Research Center, Ethiopian Space Science and Technology Institute, P.O.Box 33679, Addis Ababa, Ethiopia
Endalkachew Mengistu
Affiliation:
Astronomy and Astrophysics Research and Development Division, Entoto Observatory and Research Center, Ethiopian Space Science and Technology Institute, P.O.Box 33679, Addis Ababa, Ethiopia
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Abstract

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Several models of the solar luminosity, , in the evolutionary timescale, have been computed as a function of time. However, the solar mass-loss, , is one of the drivers of variation in this timescale. The purpose of this study is to model mass-loss varying solar luminosity, , and to predict the luminosity variation before it leaves the main sequence. We numerically computed the up to 4.9 Gyrs from now. We used the solution to compute the modeled . We then validated our model with the current solar standard model (SSM). The shows consistency up to 8 Gyrs. At about 8.85 Gyrs, the Sun loses 28% of its mass and its luminosity increased to 2.2. The model suggests that the total main sequence lifetime is nearly 9 Gyrs. The model explains well the stage at which the Sun exhausts its central supply of hydrogen and when it will be ready to leave the main sequence. It may also explain the fate of the Sun by making some improvements in comparison to previous models.

Keywords

Sunmass-losssolar luminosity
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S356: Nuclear Activity in Galaxies Across Cosmic Time , October 2019 , pp. 403 - 404
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of International Astronomical Union

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