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arXiv 2104.06218astro-ph.SR
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共生复发新星V3890 Sgr:双星参数和爆发前活动

The symbiotic recurrent nova V3890 Sgr: binary parameters and pre-outburst activity

J. Mikolajewska, K. Ilkiewicz, C. Galan, B. Monard, M. Otulakowska-Hypka, M. M. Shara, A. Udalski

摘要:

本文介绍和分析了共生型复发新星V3890 Sgr在静止期的光学光度学和高分辨率SALT光谱。轨道周期,P=747.6天已从光度和光谱数据推导出来。我们的双线光谱轨道表明,质量比q=M_g/M_WD=0.78 ± 0.05,组分质量为M_WD=1.35 ± 0.13 Msun,M_g=1.05 ± 0.11 Msun。轨道倾角约为67-69度。红巨星正在填满(或几乎填满)它的洛希瓣,而由它的洛希瓣半径d=9 kpc所确定的距离,与巨脉动周期所产生的结果一致。V3890 Sgr的爆发强度与大麦云云中RNe的爆发强度非常相似。V3890 Sgr显示出显着的光度和光谱活动之间的新星爆发的时间尺度类似于那些观察到的共生周期新星T CrB和RS Oph和Z和型共生系统。活动源有一个双温结构,我们已经与存在的吸积盘。这种活动是由吸积速率的变化引起的。我们还提供的证据表明,V3890 Sgr包含一个CO WD吸积在一个高的,几个1 e-8 - 1 e-7 Msun/年,率。WD的质量正在增长,并且应该在大约1,000,000年内产生Ia型超新星-红巨星的预期寿命。

英文摘要:

We present and analyze optical photometry and high resolution SALT spectra of the symbiotic recurrent nova V3890 Sgr at quiescence. The orbital period, P=747.6 days has been derived from both photometric and spectroscopic data. Our double-line spectroscopic orbits indicate that the mass ratio is q=M_g/M_WD=0.78+/-0.05, and that the component masses are M_WD=1.35+/-0.13 Msun, and M_g=1.05+/-0.11 Msun. The orbit inclination is approximately 67-69 degr. The red giant is filling (or nearly filling) its Roche lobe, and the distance set by its Roche lobe radius, d=9 kpc, is consistent with that resulting from the giant pulsation period. The outburst magnitude of V3890 Sgr is then very similar to those of RNe in the Large Magellanic Cloud. V3890 Sgr shows remarkable photometric and spectroscopic activity between the nova eruptions with timescales similar to those observed in the symbiotic recurrent novae T CrB and RS Oph and Z And-type symbiotic systems. The active source has a double-temperature structure which we have associated with the presence of an accretion disc. The activity would be then caused by changes in the accretion rate. We also provide evidence that V3890 Sgr contains a CO WD accreting at a high, a few 1e-8 - 1e-7 Msun/yr, rate. The WD is growing in mass, and should give rise to a Type Ia supernova within about 1,000,000 yrs - the expected lifetime of the red giant.

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