THE PAST AND FUTURE HISTORY OF REGULUS

@article{Rappaport2009THEPA,
  title={THE PAST AND FUTURE HISTORY OF REGULUS},
  author={S. Rappaport and P. Podsiadlowski and I. Horev},
  journal={The Astrophysical Journal},
  year={2009},
  volume={698},
  pages={666-675}
}
We show how the recent discovery of a likely close white dwarf companion to the well-known star Regulus, one of the brightest stars in the sky, leads to considerable insight into the prior evolutionary history of this star, including the cause of its current rapid rotation. We infer a relatively narrow range for the initial masses of the progenitor system: M 10 = 2.3 ± 0.2 M ☉ and M 20 = 1.7 ± 0.2 M ☉, where M 10 and M 20 are the initial masses of the progenitors of the white dwarf and Regulus… Expand

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References

SHOWING 1-10 OF 32 REFERENCES
EVOLUTIONARY SEQUENCES FOR LOW- AND INTERMEDIATE-MASS X-RAY BINARIES
We present the results of a systematic study of the evolution of low- and intermediate-mass X-ray binaries (LMXBs and IMXBs). Using a standard Henyey-type stellar evolution code and a standard modelExpand
A Spectroscopic Orbit for Regulus
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 days) and probable semimajor axisExpand
Faint Thermonuclear Supernovae from AM Canum Venaticorum Binaries
Helium that accretes onto a carbon/oxygen white dwarf in double white dwarf AM Canum Venaticorum (AM CVn) binaries undergoes unstable thermonuclear flashes when the orbital period is in the 3.5-25Expand
On the formation and evolution of black hole binaries
We present the results of a systematic study of the formation and evolution of binaries containing black holes and normal-star companions with a wide range of masses. We first reexamine the standardExpand
The Galactic Population of Low- and Intermediate-Mass X-Ray Binaries
We present the first study that combines binary population synthesis in the Galactic disk and detailed evolutionary calculations of low- and intermediate-mass X-ray binaries (L/IMXBs). Our approachExpand
The origin of subdwarf B stars – I. The formation channels
Subdwarf B (sdB) stars (and related sdO/sdOB stars) are believed to be helium-core-burning objects with very thin hydrogen-rich envelopes. In recent years it has become increasingly clear fromExpand
Population synthesis for double white dwarfs. II. Semi-detached systems: AM CVn stars
We study two models for AM CVn stars: white dwarfs accreting (i) from a helium white dwarf companion and (ii) from a helium-star donor. We show that in the first model possibly no accretion diskExpand
Detached white dwarf main-sequence star binaries
We initiated a comprehensive state of the art binary population synthesis study of white dwarf main-sequence star (WDMS) binaries to serve as a foundation for subsequent studies on pre-cataclysmicExpand
Presupernova Evolution in Massive Interacting Binaries
The way in which binary interaction affects the presupernova evolution of massive close binaries and the resulting supernova explosions is investigated systematically by means of a Henyey-typeExpand
A Complete Survey of Case A Binary Evolution with Comparison to Observed Algol-type Systems
We undertake a comparison of observed Algol-type binaries with a library of computed Case A binary evolution tracks. The library consists of 5500 binary tracks with various values of initial primaryExpand
...
1
2
3
4
...