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arXiv 0804.0698astro-ph
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双星15 Monocerotis

Orbit of Binary 15 Monocerotis

Zorica Cvetkovc, Istvan Vince, Slobodan Ninkovic

摘要:

本文报道了仅用15个月的散斑干涉测量获得的新的轨道根数。对于这个双星,它们是通过光谱和斑点测量以及光谱和天体测量相结合而确定的。一个新的散斑测量定年后,近星点通过的次级有一个显着的偏差,从星历值。我们修改后的轨道周期比以前的轨道周期长得多。关于早期轨道的周期是由光谱测量确定的,即由径向速度数据确定的,这里分析了这种双星的现有数据,并与我们的轨道要素相结合。第一次散斑测量始于1988年,到目前为止,已经进行了三次散斑测量。这对双星非常明亮(视星等为4.66等,即5.9等),属于早期光谱类型(主恒星O7 V,副恒星O9.5 Vn),是疏散星团NGC 2264的成员。到这个星团的距离已经被确定了很多次,并报告了不同的值。通过分析现有的数据,我们发现到15 Mon的距离最有可能是750 pc,即总质量最有可能是53.4 ${\cal M}_{\odot}$。新的轨道要素与这一距离相结合,得出了各组成部分光谱类型的预期总质量。

英文摘要:

In the paper new orbital elements obtained from speckle interferometric measurements only for 15 Mon are reported. For this binary they were determined earlier by combining spectroscopic and speckle measurements and spectroscopic and astrometric measurements. A new speckle measurement dating after the periastron passage of the secondary has a significant discrepancy from the ephemeridal value. Our revised orbit has a period significantly longer than the earlier ones. With regard that in the case of the earlier orbits the period was determined from spectroscopic measurements, i.e. from radial velocity data, the existing data of such kind for this binary are analyzed here and combined with our orbital elements. The first speckle measurement originates from 1988 and up to now three more speckle measurements have been made. This pair is bright (apparent magnitude of primary 4.66, i.e. 5.9 of secondary), of an early spectral type (primary O7V, secondary O9.5Vn) and is a member of open cluster NGC 2264. The distance to this cluster has been determined many times and different values have been reported. By analyzing the available data we find that the distance to 15 Mon is most likely about 750 pc, i.e. the total mass most likely about 53.4${\cal M}_{\odot}$. The new orbital elements combined with this distance yield a total mass expected for the spectral types of the components.

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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