Angular momentum changes due to direct impact accretion in a binary system

Jeremy F. Sepinsky, Bart Willems, Vassiliki Kalogera, Frederic A. Rasio

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We model a circular mass-transferring binary system to calculate the exchange of angular momentum between stellar spins and the orbit due to direct impact of the mass transfer stream onto the surface of the accretor. We simulate mass transfer by calculating the ballistic motion of a point mass ejected from the L1 point of the donor star, conserving the total linear and angular momentum of the system, and treating the stars as uniform density spheres with main sequence radii determined by their masses. We show that, contrary to previous assumptions in the literature, direct impact does not always act as a sink of orbital angular momentum and may in fact increase it by facilitating the transfer of angular momentum from the spin of the donor to the orbit. Here, we show an example of the exchange of angular momentum, as well as a measure of the orbital angular momentum changes for a variety of binary star systems with main sequence components.

Original languageEnglish (US)
Title of host publicationInternational Conference on Binaries - In Celebration of Ron Webbink's 65th Birthday
Pages57-58
Number of pages2
DOIs
StatePublished - Dec 1 2010
EventInternational Conference on Binaries: In Celebration of Ron Webbink's 65th Birthday - Mykonos, Greece
Duration: Jun 22 2010Jun 25 2010

Publication series

NameAIP Conference Proceedings
Volume1314
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

OtherInternational Conference on Binaries: In Celebration of Ron Webbink's 65th Birthday
CountryGreece
CityMykonos
Period6/22/106/25/10

Keywords

  • Angular Momentum Changes
  • Direct Impact
  • Mass Loss
  • Stars: Binaries: Close

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Plant Science
  • Physics and Astronomy(all)
  • Nature and Landscape Conservation

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  • Cite this

    Sepinsky, J. F., Willems, B., Kalogera, V., & Rasio, F. A. (2010). Angular momentum changes due to direct impact accretion in a binary system. In International Conference on Binaries - In Celebration of Ron Webbink's 65th Birthday (pp. 57-58). (AIP Conference Proceedings; Vol. 1314). https://doi.org/10.1063/1.3536412