NDLI: The effects of the Reimers $\eta$ on the solar rotational period when our Sun evolves to the RGB tip

Content Provider	Springer Nature Link
Author	Guo, Jianpo Lin, Ling Bai, Chunyan Liu, Jinzhong
Copyright Year	2016
Abstract	Our Sun will expand enormously and lose substantial mass via a stellar wind during the red giant branch (RGB) phase; the rotational period will be prolonged by several orders of magnitude. It is difficult to predict how much mass the Sun will lose before it reaches the RGB tip. Therefore, the solar rotational period at the RGB tip is also quite indeterminate. In this work, the Sun is considered as a two-component system comprised of a core and a convective envelope, each being allowed to rotate freely. The angular momentum transfer from the inner planets to the solar envelope is taken into consideration. Using Eggleton’s stellar evolution code, we study how the solar rotational period at the RGB tip depends on the value of Reimers $\eta$ chosen. The solar envelope’s rotational period at the RGB tip varies from 1 792 to 736 934 years, as the Reimers $\eta$ is changed from 0.00 to 0.75. Recent observations show that the average Reimers $\eta$ of Sun-like stars is 0.477. Adopting this average value of the Reimers $\eta$ , the solar envelope’s rotational period at the RGB tip will be 24 868 years. We also show how the envelope’s rotational evolves with age and luminosity. Other Sun-like stars, with different planetary configurations, may prematurely eject mass and lead to planetary nebulae, if they engulf a brown-dwarf companion at the RGB tip. Swallowing a planet with 13 Jupiter masses and a 3-day orbit, a Sun-like star can become a rapidly rotating giant star.
Starting Page	1
Ending Page	10
Page Count	10
File Format	PDF
ISSN	0004640X
Journal	Astrophysics and Space Science
Volume Number	362
Issue Number	1
e-ISSN	1572946X
Language	English
Publisher	Springer Netherlands
Publisher Date	2016-12-19
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sun: rotation Stars: mass loss ISM: planetary nebulae Planets: hot Jupiter Astrophysics and Astroparticles Astronomy, Observations and Techniques Cosmology Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics) Astrobiology
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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