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A Spectroscopic Orbit for Regulus

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arxiv 0806.3473 v1 pith:5FIHYDUZ submitted 2008-06-20 astro-ph

D. R. Gies , S. Dieterich , N. D. Richardson , A. R. Riedel , B. L. Team , H. A. McAlister , W. G. Bagnuolo , Jr.
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E. D. Grundstrom S. Stefl Th. Rivinius D. Baade
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keywords massreguluslargespectroscopicstarangularargueaxis
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We present a radial velocity study of the rapidly rotating B-star Regulus that indicates the star is a single-lined spectroscopic binary. The orbital period (40.11 d) and probable semimajor axis (0.35 AU) are large enough that the system is not interacting at present. However, the mass function suggests that the secondary has a low mass (M_2 > 0.30 M_sun), and we argue that the companion may be a white dwarf. Such a star would be the remnant of a former mass donor that was the source of the large spin angular momentum of Regulus itself.

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Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. A New Sirius-like System at Only 21 Parsecs: An Elusive White Dwarf Companion to the Nearby K-dwarf HD 38230

    astro-ph.SR 2026-07 conditional novelty 6.0 of 10

    HD 38230 B is a gravitationally bound white dwarf at 21 pc with a dynamical mass of 0.71 solar masses on a ~1400-year orbit.

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