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arXiv 0809.2728astro-ph
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根据SMC中食双星观测的新距离和深度估计

New distance and depth estimates from observations of eclipsing binaries in the SMC

Pierre L. North, Romain Gauderon, Frederic Royer

摘要:

本文给出了用FLAMES@VLT观测的33个食双星的实例。所获得的径向速度曲线,连同现有的OGLE光变曲线,允许确定所有的恒星和轨道参数的这些二元系统。根据26个最可靠的系统,SMC观测部分的平均距离模量为19.05。假设到单个系统的距离模量的平均误差为0.1 mag,并且距离模量为高斯分布,则我们获得0.36 mag或10.6 kpc的2-sigma深度。还给出了双星和H II气体运动学的一些结果。

英文摘要:

A sample of 33 eclipsing binaries observed in a field of the SMC with FLAMES@VLT is presented. The radial velocity curves obtained, together with existing OGLE light curves, allowed the determination of all stellar and orbital parameters of these binary systems. The mean distance modulus of the observed part of the SMC is 19.05, based on the 26 most reliable systems. Assuming an average error of 0.1 mag on the distance modulus to an individual system, and a gaussian distribution of the distance moduli, we obtain a 2-sigma depth of 0.36 mag or 10.6 kpc. Some results on the kinematics of the binary stars and of the H II gas are also given.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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