EFFECTS OF A COMPANION STAR ON SLOW NOVA OUTBURSTS—TRANSITION FROM STATIC TO WIND EVOLUTIONS

EFFECTS OF A COMPANION STAR ON SLOW NOVA OUTBURSTS—TRANSITION FROM STATIC TO WIND EVOLUTIONS
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伴星对慢新星爆发的影响——从静态演化到风演化的转变

DOI:
10.1088/0004-637x/743/2/157
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发表时间:
2011
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
I. Hachisu
I. Hachisu
中科院分区:
--
文献类型:
--
作者:
M. Kato;I. Hachisu

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〜0.5–0.7 M☉的低质量白矮星中可能发生两种类型的新星演化,即,像通常的经典新星一样具有光学厚风的演化,或者像共生新星PU Vul那样没有光学厚风的另一种演化。后一种类型的特点是光谱没有强风迹象,并且其光曲线中具有持久的平坦光学峰值。我们提出从没有光学厚风的演化到有光学厚风的通常演化的过渡,作为慢新星的新爆发模型,该模型显示出相对持久的多峰阶段,随后是风阶段,如慢新星 V723 Cas、HR Del 和 V5558 Sgr。我们用伴星效应的一维近似计算了新星包络,发现当伴星深深嵌入扩展的新星包络中时,静态包络的结构接近光学厚风解的结构。因此,从静态解决方案到风解决方案的转变是由同伴的效果触发的。这种转变发生在像 V723 Cas 这样的近距离双星新星中,但不会在像 PU Vul 这样的长周期双星中触发。我们再次证实了之前的结果,即由于轨道上的包层密度较低,几乎所有氢/氦新星中的摩擦能量沉积都可以忽略不计。
Two types of nova evolutions can occur in low-mass white dwarfs of ∼0.5–0.7 M☉, i.e., an evolution with optically thick winds like in usual classical novae, or an another type of evolution without them like in the symbiotic nova PU Vul. The latter type is characterized by spectra with no indication of strong winds as well as a long-lasting flat optical peak in its light curve. We propose a transition from evolution with no optically thick wind to usual evolution with optically thick winds as a new outburst model for slow novae that show a relatively long-lasting multipeak phase followed by a wind phase like in the slow novae V723 Cas, HR Del, and V5558 Sgr. We calculated nova envelopes with one-dimensional approximation of the companion's effects and found that when the companion star is deeply embedded in the extended nova envelope, the structure of the static envelope approaches that of the optically thick wind solution. Thus, the transition from static to wind solution is triggered by the effect of the companion. The transition occurs in a close binary nova like V723 Cas, but is not triggered in a long-period binary like PU Vul. We reconfirm our previous results that the frictional energy deposition is negligibly small in almost all hydrogen/helium novae because of the low envelope density at the orbit.
DOI: 10.1086/508063
发表时间: 2006-07
期刊: The Astrophysical Journal Supplement Series
影响因子: --
作者:
I. Hachisu;M. Kato
通讯作者: I. Hachisu;M. Kato
DOI: 10.1086/517600
发表时间: 2007-02
期刊: The Astrophysical Journal
影响因子: --
作者:
I. Hachisu;M. Kato
通讯作者: I. Hachisu;M. Kato
基础科学学院/启明大学(韩国)
DOI: --
发表时间: --
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经典新星爆发前极大期停止的性质:V723 仙后座和 V463 盾牌座
DOI: --
发表时间: 2004
期刊: The Astrophysical Journal 612
影响因子: --
作者:
Hachisu;Izumi
通讯作者: Izumi