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Centrifugally Driven Mass Loss and Outbursts of Massive Stars

Zhao, Xihui and Fuller, Jim (2020) Centrifugally Driven Mass Loss and Outbursts of Massive Stars. Monthly Notices of the Royal Astronomical Society, 495 (1). pp. 249-265. ISSN 0035-8711. doi:10.1093/mnras/staa1097.

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Rotation and mass-loss are crucially interlinked properties of massive stars, strongly affecting their evolution and ultimate fate. Massive stars rotating near their break-up limit shed mass centrifugally, creating Be stars with circumstellar discs and possibly driving outbursts. Using the MESA stellar evolution code, we examine the effects of efficient angular momentum transport on the main-sequence and post-main-sequence rotational evolution of massive stars. In rapid rotators, angular momentum transported from the contracting core to the expanding envelope can spin-up the surface layers past the break-up rate, particularly for stars near (or beyond) the end of the main-sequence and in low-metallicity environments. We also demonstrate that centrifugal instabilities could arise in rapidly rotating massive stars, potentially triggering the S Doradus outbursts observed in luminous blue variable stars. Prior mass accretion from a binary companion increases both the likelihood and the intensity of centrifugal mass-loss. We discuss implications for massive stellar evolution, Be stars, and luminous blue variables.

Item Type:Article
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URLURL TypeDescription Paper
Fuller, Jim0000-0002-4544-0750
Additional Information:© 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model ( Accepted 2020 April 17. Received 2020 April 17; in original form 2020 March 18. Published: 24 April 2020. We thank Nathan Smith and Matteo Cantiello for very helpful suggestions. This research is funded in part by an Innovator Grant from The Rose Hills Foundation, and the Sloan Foundation through grant no. FG-2018-10515.
Group:Astronomy Department, TAPIR
Funding AgencyGrant Number
Rose Hills FoundationUNSPECIFIED
Alfred P. Sloan FoundationFG-2018-10515
Subject Keywords:instabilities – stars: evolution – stars: massive – stars: mass-loss – stars: rotation
Issue or Number:1
Record Number:CaltechAUTHORS:20200519-120647560
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Official Citation:Xihui Zhao, Jim Fuller, Centrifugally Driven Mass Loss and Outbursts of Massive Stars, Monthly Notices of the Royal Astronomical Society, staa1097,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103314
Deposited By: Tony Diaz
Deposited On:19 May 2020 19:54
Last Modified:16 Nov 2021 18:20

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