The turn-on of mass transfer in AM CVn binaries: Implications for RX J0806+1527 and RX J1914+2456

Christopher J. Deloye*, Ronald E Taam

*Corresponding author for this work

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

Abstract

We report on evolutionary calculations of the onset of mass transfer in AM CVn binaries, treating the donor's evolution in detail. During the early contact phase, while the mass transfer rate, Ṁ, is increasing, gravity wave emission continues to drive the binary to shorter orbital periods, P orb. We show the phase where Ṁ > 0 and ν̇ > 0 (ν = 1/P orb) can last between 10 3 and 10 6 yrs, significantly longer than previously estimated. We apply our calculations to RX J0806+1527 (P orb = 321 s) and RX J914+2456 (P orb = 569 s), both of which have measured ν̇ > 0, arguing that a ν̇ > 0 does not select between the unipolar inductor and accretion driven models proposed as the source of X-rays in these systems. For the accretion model, we predict for RX J0806 that ν̈ ≈ 1.0 - 1.5 × 10 -28 Hz s -2 and argue that timing observations can probe ν̈ at this level with a total ≈ 20 yr baseline.

Original languageEnglish (US)
Title of host publicationTHE MULTICOLORED LANDSCAPE OF COMPACT OBJECTS AND THEIR EXPLOSIVE ORIGINS
Pages661-666
Number of pages6
DOIs
StatePublished - Oct 24 2007
EventTHE MULTICOLORED LANDSCAPE OF COMPACT OBJECTS AND THEIR EXPLOSIVE ORIGINS - Cefalu, Sicily, Italy
Duration: Jun 11 2006Jun 24 2006

Publication series

NameAIP Conference Proceedings
Volume924
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

OtherTHE MULTICOLORED LANDSCAPE OF COMPACT OBJECTS AND THEIR EXPLOSIVE ORIGINS
CountryItaly
CityCefalu, Sicily
Period6/11/066/24/06

Keywords

  • Binaries: close
  • Gravitational waves
  • Stars: individual (RX J0806+1527, RX J1914+2456)
  • White dwarfs

ASJC Scopus subject areas

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

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