论文标题
三个潜在的红色NOVA祖细胞的光度分析
Photometric Analysis of Three Potential Red Nova Progenitors
论文作者
论文摘要
我们介绍了三个亮红Nova祖细胞触点二进制系统的光度分析：ASAS J082151-0612.6，TYC 7281-269-1和TYC 7275-1968-1。这三个系统中的主要组件是太阳能型低质量恒星，半径略大于其零年龄主序列对应物。与大多数接触二进制系统一样，次生的半径和亮度远高于其主要序列。这三个都具有极低的质量比率为0.075至0.097，并且两个质量比具有高度的接触度，超过75％。这三个均具有低于轨道稳定性的理论值的质量比和分离。还探索了色球活性是磁性活性和磁性制动的标志，也被认为在介导角动量损失中很重要。所有三个系统都展示了O'Connell效应，并且所有系统都需要引入星空，以提供更好的光曲线解决方案。此外，我们表明ASAS J082151-0612.6和TYC 7281-269-1在表明高色球活性的范围内具有紫外线过量。潜在的显着磁性活性的另一个量度是X射线光度。 TYC 7275-1968-1，以及TYC 7281-269-1的X射线光度远高于其他接触二进制系统。我们得出的结论是，这三个可能是不稳定的，因此是潜在的合并候选人。
We present photometric analysis of three bright red nova progenitor contact binary systems: ASAS J082151-0612.6, TYC 7281-269-1 and TYC 7275-1968-1. The primary components in all three systems are solar-type low mass stars with radii somewhat larger than their Zero Age Main Sequence counterparts. The secondaries, as in most contact binary systems, have radii and luminosities well above their main sequence counterparts. All three have extreme low mass ratios ranging from 0.075 to 0.097 and two have high degrees of contact, in excess of 75%. All three have mass ratios and separations below the theoretical values for orbital stability. Chromospheric activity, a hallmark of magnetic activity and magnetic braking, considered important in mediating angular momentum loss, is also explored. All three systems demonstrate the O'Connell effect, and all systems require the introduction of star spots for a better light curve solution. In addition, we show that ASAS J082151-0612.6 and TYC 7281-269-1 have a UV colour excess in the range indicating high chromospheric activity. Another measure of potential significant magnetic activity is X-Ray luminosity; TYC 7275-1968-1, and probably also TYC 7281-269-1, have X-Ray luminosity well above other contact binary systems. We conclude that it is likely that all three are unstable and hence are potential merger candidates.
