TY - GEN
T1 - The turn-on of mass transfer in AM CVn binaries
T2 - THE MULTICOLORED LANDSCAPE OF COMPACT OBJECTS AND THEIR EXPLOSIVE ORIGINS
AU - Deloye, Christopher J.
AU - Taam, Ronald E.
PY - 2007
Y1 - 2007
N2 - 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.
AB - 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.
KW - Binaries: close
KW - Gravitational waves
KW - Stars: individual (RX J0806+1527, RX J1914+2456)
KW - White dwarfs
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U2 - 10.1063/1.2774925
DO - 10.1063/1.2774925
M3 - Conference contribution
AN - SCOPUS:35349015963
SN - 0735404348
SN - 9780735404342
T3 - AIP Conference Proceedings
SP - 661
EP - 666
BT - THE MULTICOLORED LANDSCAPE OF COMPACT OBJECTS AND THEIR EXPLOSIVE ORIGINS
Y2 - 11 June 2006 through 24 June 2006
ER -