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arXiv 2102.13401astro-ph.SR
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四颗接触双星的光度和光谱分析

Photometric and Spectroscopic analysis of four contact binaries

Alaxendra Panchal, Yogesh C. Joshi

摘要:

本文报道了四个W Uma双星J015829.5+260333(以下简称J 0158)、J030505.1+293443(以下简称J 0305)、J102211.7+310022(以下简称J1022)和KW Psc的光度和光谱分析结果。VRcIc波段的光度观测是用1.3米的毁灭快速光学望远镜进行的。对于低分辨率光谱,我们使用2米喜马拉雅钱德拉望远镜以及4米LAMOST调查的档案数据。J 0158和J 0305系统的周期增长率分别为5.26(+/-1.72 x10 ^-7天/年和1.78(+/-1.52 x10 ^-6天/年。发现J1022的周期以4.22(+/-1.67 x10 ^-6天/年)的速率递减。KW Psc之期间分析显示其期间并无变动。光变曲线的建模采用PHOEBE软件包,基本参数的计算采用GAIA视差法。光变曲线的不对称性解释与冷点在特定位置上的系统的组件之一的假设。根据温度、质量比、填充因子和周期,J1022系统被确定为W亚型系统,而其他系统则表现出一些混合性质。为了探测这些WUMa双星的色球活动,将它们的光谱与已知的不活动恒星的光谱进行了比较。比较显示Hα、Hβ和Ca II的发射。为了了解这些系统的演化状态,我们将这些组成部分绘制在质量-半径和质量-光度平面上,并与其他特征良好的双星系统一起绘制。所有系统的次要成分都远离ZAMS,这表明次要成分比主要成分更进化。

英文摘要:

We present the photometric and spectroscopic analysis of four W UMa binaries J015829.5+260333 (hereinafter as J0158), J030505.1+293443 (hereinafter as J0305), J102211.7+310022 (hereinafter as J1022) and KW Psc. The VRcIc band photometric observations are carried out with the 1.3-m Devasthal Fast Optical Telescope. For low resolution spectroscopy, we used 2-m Himalayan Chandra Telescope as well as the archival data from 4-m LAMOST survey. The systems J0158 and J0305 show a period increase rate of 5.26(+/-1.72)x10^-7 days/yr and 1.78(+/-1.52)x10^-6 days/yr, respectively. The period of J1022 is found to be decreasing with a rate of 4.22(+/-1.67)x10^-6 days/yr. The period analysis of KW Psc displays no change in its period. PHOEBE package is used for the light curve modeling and basic parameters are evaluated with the help of GAIA parallax. The asymmetry of light curves is explained with the assumption of cool spots at specific positions on one of the components of the system. On the basis of temperatures, mass ratios, fill-out factors and periods, the system J1022 is identified as W-subtype systems while the others show some mixed properties. To probe the chromospheric activities in these W UMa binaries, their spectra are compared with the known inactive stars spectra. The comparison shows emission in Hα, Hβand CaII. To understand the evolutionary status of these systems, the components are drawn in mass-radius and mass-luminosity planes with other well characterized binary systems. The secondary components of all the systems are away from ZAMS which indicates that secondary is more evolved than the primary component.

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