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2011MNRAS.415.1396M - Mon. Not. R. Astron. Soc., 415, 1396-1408 (2011/August-1)
The diffusion-induced nova scenario: CK Vul and PB8 as possible observational counterparts.
MILLER BERTOLAMI M.M., ALTHAUS L.G., OLANO C. and JIMENEZ N.
Abstract (from CDS):
Based on physically sound white dwarf models, we find that the range of helium buffer masses for these diffusion-induced novae to occur is significantly smaller than that predicted by the only previous study of this scenario. As a matter of fact, we find that these flashes do occur only in some low-mass (M ≲ 0.6 M☉) and low-metallicity (ZZAMS ≲ 0.001) remnants about 106-107 yr after departing from the AGB. For these objects, we expect the luminosity to increase by about 4 orders of magnitude in less than a decade. We also show that diffusion-induced novae should display a very typical eruption light curve, with an increase of about a few magnitudes per year before reaching a maximum of MV ∼-5 to -6. Our simulations show that surface abundances after the outburst are characterized by log NH/NHe∼-0.15... 0.6 and N > C≳ O by mass fractions. Contrary to previous speculations we show that these events are not recurrent and do not change substantially the final H-content of the cool (DA) white dwarf.
Finally, with the aid of model predictions we discuss the possibility that Nova Vul 1670 (CK Vul) and the recently proposed [WN/WC]-central stars of planetary nebulae could be observational counterparts of this diffusion-induced nova scenario. We conclude that, despite discrepancies with observations, the scenario offers one of the best available explanations for CK Vul and, with minor modifications, explains the observed properties of [WN/WC]-central stars of planetary nebulae. Gravitational microlensing as a probe of the electron-scattering region in Q2237+0305
Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS
Journal keyword(s): stars: AGB and post-AGB - stars: individual: CK Vul - stars: individual: PB8 - white dwarfs - stars: Wolf-Rayet
Simbad objects: 6
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