Evolution of the symbiotic nova PU VUL - Outbursting white dwarf, nebulae, and pulsating red giant companion

Mariko Kato, Joanna Mikołajewska, Izumi Hachisu

研究成果: Article査読

16 被引用数 (Scopus)

抄録

We present a composite light-curve model of the symbiotic nova PUVul (Nova Vulpeculae 1979) that shows a long-lasting flat optical peak followed by a slow decline. Our model light curve consists of three components of emission, i.e., an outbursting white dwarf (WD), its M-giant companion, and the nebulae. The WD component dominates in the flat peak while the nebulae dominate after the photospheric temperature of the WD rises to log T (K) ≳ 4.5, suggesting its WD origin. We analyze the 1980 and 1994 eclipses to be total eclipses of the WD occulted by the pulsating M-giant companion with two sources of the nebular emission; one is an unocculted nebula of the M-giant's cool-wind origin and the other is a partially occulted nebula associated to the WD. We confirmed our theoretical outburst model of PUVul by new observational estimates, which spanned 32 yr, of the temperature and radius. Also our eclipse analysis confirmed that the WD photosphere decreased by two orders of magnitude between the 1980 and 1994 eclipses. We obtain the reddening E(B - V) 0.3 and distance to PUVul d 4.7 kpc. We interpret the recent recovery of brightness in terms of eclipse of the hot nebula surrounding the WD, suggesting that hydrogen burning is ongoing. To detect supersoft X-rays, we recommend X-ray observations around 2014 June when absorption by neutral hydrogen is minimum.

本文言語English
論文番号5
ジャーナルAstrophysical Journal
750
1
DOI
出版ステータスPublished - 2012 5 1

ASJC Scopus subject areas

  • 天文学と天体物理学
  • 宇宙惑星科学

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