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arXiv 0910.4482astro-ph.SRastro-ph.IM
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双线分光双星HD78418、HD123999、HD160922、HD200077和HD210027的高精度轨道和物理参数

High precision orbital and physical parameters of double-lined spectroscopic binary stars - HD78418, HD123999, HD160922, HD200077 and HD210027

M. Konacki, M. Muterspaugh, S. Kulkarni, K. Helminiak

摘要:

本文给出了双线分光双星HD 78418、HD 123999、HD 160922、HD 200077和HD 210027的高精度径向速度。它们是根据2003-2008年期间Keck I/Hires、Shane/CAT/Hamspec和TNG/Sarge望远镜/摄谱仪收集的高分辨率阶梯光谱获得的,作为TATOOINE搜索环联行星的一部分。使用我们的新碘电池技术计算的RV双线双星。RV的精度为1-10 m/s的量级。我们的RV结合档案可见度测量从帕洛玛试验台干涉仪使我们能够获得非常精确的光谱/天体测量轨道和物理参数的二进制文件。特别是,我们得到的质量,绝对K和H带的幅度和弛豫。质量与K和H波段的绝对星等一起使我们能够估计双星的年龄。这些RV使我们能够获得一些最精确的双星质量测定。仅m*sin(i)的分数精度,因此仅基于RV,范围为0.02%至0.42%。当与PTI天体测量相结合时,在三个最好的情况下,质量的分数精度范围从0.06%到0.5%。其中,HD 210027组件的质量在精度上可与相对论双脉冲星系统PSRJ 0737 -3039组件的质量测定相媲美。在不久的将来,对于双线食双星,我们希望用我们的技术得到质量的分数精度高达~0.001%。这个精确度比太阳系外最精确的天体--双中子星系统PSRB 1913 +16--的质量测定高出一个数量级。

英文摘要:

We present high precision radial velocities (RVs) of double-lined spectroscopic binary stars HD78418, HD123999, HD160922, HD200077 and HD210027. They were obtained based on the high resolution echelle spectra collected with the Keck I/Hires, Shane/CAT/Hamspec and TNG/Sarge telescopes/spectrographs over the years 2003-2008 as a part of TATOOINE search for circumbinary planets. The RVs were computed using our novel iodine cell technique for double-line binary stars. The precision of the RVs is of the order of 1-10 m/s. Our RVs combined with the archival visibility measurements from the Palomar Testbed Interferometer allow us to derive very precise spectroscopic/astrometric orbital and physical parameters of the binaries. In particular, we derive the masses, the absolute K and H band magnitudes and the parallaxes. The masses together with the absolute magnitudes in the K and H bands enable us to estimate the ages of the binaries. These RVs allow us to obtain some of the most accurate mass determinations of binary stars. The fractional accuracy in m*sin(i) only and hence based on the RVs alone ranges from 0.02% to 0.42%. When combined with the PTI astrometry, the fractional accuracy in the masses ranges in the three best cases from 0.06% to 0.5%. Among them, the masses of HD210027 components rival in precision the mass determination of the components of the relativistic double pulsar system PSRJ0737-3039. In the near future, for double-lined eclipsing binary stars we expect to derive masses with a fractional accuracy of the order of up to ~0.001% with our technique. This level of precision is an order of magnitude higher than of the most accurate mass determination for a body outside the Solar System - the double neutron star system PSRB1913+16.

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