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arXiv 1306.1501astro-ph.SR
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Nova Mon 2012的光度演化、轨道调制和前身

Photometric evolution, orbital modulation and progenitor of Nova Mon 2012

U. Munari, S. Dallaporta, F. Castellani, P. Valisa, A. Frigo, L. Chomiuk, V. A. R. M. Ribeiro

摘要:

我们提出并讨论了准确和密集映射的BVRI光变曲线的氖新星Mon 2012年,补充的演变Stromgren b和y波段和相关的发射线的综合通量。我们的监测从新星的光学发现开始,一直延伸到+270天,远远超过了X射线超软阶段的结束。这颗新星显示出非常平滑的光变曲线。在SSS阶段开始时,y光变曲线和V光变曲线之间出现分叉,在SSS阶段结束时出现拐点。在未观测到的光学最大值时,新星的视星等被限制在+2.8=<V=<4.2。在新星演化过程中,伴随着光学亮度0.29585(+/-0.00002)天的轨道调制的出现、振幅增长和消亡。所观察到的调制具有近正弦的形状和弱的次最小值在相位0.5。我们赞成的解释,在叠加的椭圆形变形的洛希瓣填充同伴和照射的一面面临的WD。类似的光变曲线是典型的共生星,其中一个充满罗氏瓣的巨星被一个非常热的WD照射。由于高轨道倾角,施主星和吸积盘之间的相互掩星可能有助于观察到的调制。新星Mon 2012在爆发前的平静期的光学+红外光谱能量分布很好地拟合了一颗早期K型主序星(~ K3 V),距离为1.5 kpc,红化E(B-V)=0.38,有一颗WD伴星和一个吸积盘,有助于观察到蓝色过量和中等的H α发射。一颗典型的早期K型主序星,质量约为0.75 Msun,半径约为0.8 Rsun,其洛希叶的轨道周期为P=0.29585天,并有一颗质量更大的WD伴星。

英文摘要:

We present and discuss accurate and densely mapped BVRI lightcurves of the neon Nova Mon 2012, supplemented by the evolution in Stromgren b and y bands and in the integrated flux of relevant emission lines. Our monitoring started with the optical discovery of the nova and extend to day +270, well past the end of the super-soft phase in X-rays. The nova displayed very smoothly evolving lightcurves. A bifurcation between y and V light-curves took place at the start of the SSS phase, and a knee developed toward the end of the SSS phase. The apparent magnitude of the nova at the unobserved optical maximum is constrained to +2.8=<V=<4.2. The appearance, grow in amplitude and then demise of a 0.29585 (+/-0.00002) days orbital modulation of the optical brightness was followed along the nova evolution. The observed modulation has a near-sinusoidal shape and a weak secondary minimum at phase 0.5. We favor an interpretation in terms of super-imposed ellipsoidal distortion of the Roche lobe filling companion and irradiation of its side facing the WD. Similar lightcurves are typical of symbiotic stars where a Roche lobe filling giant is irradiated by a very hot WD. Given the high orbital inclination, mutual occultation between the donor star and the accretion disk could contribute to the observed modulation. The optical+infrared spectral energy distribution of Nova Mon 2012 during the quiescence preceeding the outburst is nicely fitted by a early K-type main-sequence star (~K3V) at 1.5 kpc distance, reddened by E(B-V)=0.38, with a WD companion and an accretion disk contributing to the observed blue excess and moderate Halpha emission. A typical early K-type main-sequence star with a mass of ~0.75 Msun and a radius of ~0.8 Rsun, would fill its Roche lobe for a P=0.29585 day orbital period and a more massive WD companion.

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