arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.12196astro-ph.SRastro-ph.HE
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新星Per 2018的持续爆发后亮度,进化的伴侣和长轨道周期

The sustained post-outburst brightness of Nova Per 2018, the evolved companion, and the long orbital period

U. Munari, S. Moretti, A. Maitan

摘要:

新星Per 2018(= V392 Per)在比静止亮2等时停止了从最大值的下降,自2019年以来一直稳定在这样的平台上。喷出物已经完全稀释到星际空间中。我们在平台阶段获得了V392 Per的BVRIGrizY光度学和光谱学,并将其与新星爆发前收集的等效数据进行了比较。我们发现伴星是G9 IV/III,轨道周期为3.4118天,使V392 Per成为已知周期最长的经典新星。Per V392在理论等时线上的位置介于经典新星和共生双星中爆发的新星之间,在某种意义上弥补了这一差距。红化的结果是E(B-V)=0.72,拟合等时线得到的结果是:系统的年龄为3.6 Gyr,伴星的年龄为1.35 Msun、5.3 Rsun和15 Lsun。喷出物中Ne的大量过剩和从新星最大值的快速下降都指向一个大质量的白矮星(M(WD)>= 1.1-1.2 Msun)。该系统被视为接近极上的条件和电流平台阶段是由仍然在表面燃烧的WD的CS的照射引起的。

英文摘要:

Nova Per 2018 (= V392 Per) halted the decline from maximum when it was 2mag brighter than quiescence and since 2019 has been stable at such a plateau. The ejecta have already fully diluted into the interstellar space. We obtained BVRIgrizY photometry and optical spectroscopy of V392 Per during the plateau phase and compared it with equivalent data gathered prior to the nova outburst. We find the companion star to be a G9 IV/III and the orbital period to be 3.4118 days, making V392 Per the longest known period for a classical nova. The location of V392 Per on the theoretical isochrones is intermediate between that of classical novae and novae erupting within symbiotic binaries, in a sense bridging the gap. The reddening is derived to be E(B-V)=0.72 and the fitting to isochrones returns a 3.6 Gyr age for the system and 1.35 Msun, 5.3 Rsun, and 15 Lsun for the companion. The huge Ne overabundance in the ejecta and the very fast decline from nova maximum both point to a massive white dwarf (M(WD) >= 1.1-1.2 Msun). The system is viewed close to pole-on conditions and the current plateau phase is caused by irradiation of the CS by the WD still burning at the surface.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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