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arXiv 1303.2629astro-ph.SR
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食双星DQ Velorum的基本恒星和吸积盘参数

Fundamental stellar and accretion disc parameters of the eclipsing binary DQ Velorum

D. Barría, R. E. Mennickent, L. Schmidtobreick, G. Djurasević, Z. Kołaczkowski, G. Michalska, M. Vucković, E. Niemczura

摘要:

为了增加越来越多的收集良好的研究双周期变量(DPVs),我们进行了第一次光谱和光度分析的食双星DQ Velorum获得其主要的物理恒星和轨道参数。结合光谱和光度观测,涵盖几个轨道周期,使我们能够估计恒星的性质的二进制组件和轨道参数。我们还搜索了更大质量恒星周围的星周物质。我们分离DQ Velorum复合光谱和测量径向速度与双光谱双星的迭代方法。我们得到了径向速度曲线,并计算了光谱质量比。我们将单线光谱与合成光谱网格进行了比较,并估计了恒星的温度。我们用基于单纯形算法的拟合方法模拟了V波段光变曲线,其中包括一个吸积盘。为了限制主要的恒星参数,我们将质量比和施主温度固定为光谱分析得到的值。我们得到了施主和施主的质量,半径和温度的恒星组件。我们发现DQ Vel是一个半分离系统,由一个B3 V增益星和一个A1 III施主星以及围绕增益星的扩展吸积盘组成。该光盘是填补89%的增益罗氏叶,它有一个凹的形状,是厚在其边缘比在其中心。我们在V波段光变曲线的残差中发现了一个显著的亚轨道频率0.19 d^{-1},我们将其解释为增益星的缓慢脉动B型(SPB)的脉动。我们还估计距离的二进制(3.1千秒差距)使用的绝对半径,视星等,和有效温度的组件在我们的研究中发现。

英文摘要:

To add to the growing collection of well-studied double periodic variables (DPVs) we have carried out the first spectroscopic and photometric analysis of the eclipsing binary DQ Velorum to obtain its main physical stellar and orbital parameters. Combining spectroscopic and photometric observations that cover several orbital cycles allows us to estimate the stellar properties of the binary components and the orbital parameters. We also searched for circumstellar material around the more massive star. We separated DQ Velorum composite spectra and measured radial velocities with an iterative method for double spectroscopic binaries. We obtained the radial velocity curves and calculated the spectroscopic mass ratio. We compared our single-lined spectra with a grid of synthetic spectra and estimated the temperature of the stars. We modeled the V-band light curve with a fitting method based on the simplex algorithm, which includes an accretion disc. To constrain the main stellar parameters we fixed the mass ratio and donor temperature to the values obtained by our spectroscopic analysis. We obtain donor and gainer masses, the radii, and temperatures for the stellar components. We find that DQ Vel is a semi-detached system consisting of a B3V gainer and an A1III donor star plus an extended accretion disc around the gainer. The disc is filling 89% of the gainer Roche lobe and it has a concave shape that is thicker at its edge than at its centre. We find a significant sub-orbital frequency of 0.19 d^{-1} in the residuals of the V-band light curve, which we interpret as a pulsation of an slowly pulsating B-type (SPB) of a gainer star. We also estimate the distance to the binary (3.1 kpc) using the absolute radii, apparent magnitudes, and effective temperatures of the components found in our study.

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