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arXiv 0903.1349astro-ph.SR
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三颗复发新星的轨道周期

Orbital Periods for Three Recurrent Novae

Bradley E. Schaefer

摘要:

我报告的发现轨道周期的三个经常性的新星在我们的银河系。根据2004-2008年的SMARTS测光,V745 Sco的轨道周期为510+-20天,具有椭球调制。V3890 Sgr的轨道周期为519.7+-0.3天,具有椭球调制和浅食,主要基于1995-2008年的SMARTS和AAVSO测光,但也可以追溯到1899年的档案板。此外,在红色区域还可以看到振幅为0.2等、周期为103.8 ± 0.4天的正弦调制,这是由巨大伴星的普通脉动引起的。V394 CrA的轨道周期等于其主测光周期的两倍(P_orb=1.515682+-0.000008天),基于1989-2008年的测光。我使用所有可用的信息(包括UBVRIJHK光谱能量分布)来获得与红巨星同伴的四个RNe的距离,T CrB为800+-140 pc,RS Oph为4300+-700 pc,V745 Sco为7300+-1200 pc,V3890 Sgr为6000+-1000 pc。此外,根据许多可靠的测量,RS Oph系统中的红巨星的质量损失率接近3.7 × 10 ^-8 M_sun/yr,这太弱了(100,000倍),无法以已知的3.9 × 10 ^-6 M_sun/yr的速度为白矮星提供质量。因此,让物质足够快地到达白矮星的唯一方法是通过洛希瓣溢出,这确信地表明,到RS Oph的距离>~3000 pc。

英文摘要:

I report on the discovery of the orbital periods of three recurrent novae in our galaxy. V745 Sco has an orbital period of 510+-20 days with ellipsoidal modulations, based on SMARTS photometry from 2004-2008. V3890 Sgr has an orbital period of 519.7+-0.3 days with ellipsoidal modulations and a shallow eclipse, based primarily on SMARTS and AAVSO photometry from 1995-2008, but also extending back to 1899 with archival plates. In addition, a sinusoidal modulation of amplitude 0.2 mag and period 103.8+-0.4 days is seen mainly in the red, with this attributed to ordinary pulsations in the giant companion star. V394 CrA has an orbital period equal to twice its primary photometric period (P_orb=1.515682+-0.000008 days), as based on photometry extending from 1989-2008. I use all available information (including the UBVRIJHK spectral energy distributions) to get distances to the four RNe with red giant companions as 800+-140 pc for T CrB, 4300+-700 pc for RS Oph, 7300+-1200 pc for V745 Sco, and 6000+-1000 pc for V3890 Sgr. Further, the red giant in the RS Oph system has a mass loss rate of close to 3.7x10^-8 M_sun/yr as based on many confident measures, and this is too weak (by a factor of 100,000) to supply the white dwarf with mass at the known rate of 3.9x10^-6 M_sun/yr. Thus, the only way to get matter onto the white dwarf fast enough is through Roche lobe overflow, and this confidently demonstrates that the distance to RS Oph is >~3000 pc.

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