Statistics – Computation
Scientific paper
Aug 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...394l..53w&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 394, no. 2, Aug. 1, 1992, p. L53-L56. Research supported by NATO-
Statistics
Computation
7
Accretion Disks, Binary Stars, Stellar Evolution, Stellar Mass Accretion, White Dwarf Stars, Asymptotic Giant Branch Stars, Computational Astrophysics, Stellar Oscillations, Stellar Temperature
Scientific paper
The common proper motion binary white dwarf system L151 - 81A/B, consisting of two (a DA and a DB) components is particularly interesting because the cooler (older) hydrogen-atmosphere (DA) star has T(eff) = 12,000 +/-2000 K, nominally placing it within the ZZ Ceti instability strip. Calculations are presented showing how the estimated mass of the accreted hydrogen layer compares with the theoretical hydrogen layer masses which are consistent with pulsation, M(H)/solar mass ratio between values 10 exp -8 and 10 exp -14 (Winget and Fontaine, 1982). It is shown that, if the DA is found to pulsate, then the Bondi-Hoyle rate is an overestimate by some 2-4 orders of magnitude. Conversely, if the star does not pulsate and is found to lie unambiguously within the instability strip, then the Bondi-Hoyle rate is a reasonable order of magnitude estimate.
Oswalt Terry D.
Wood Matt A.
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