北半球疏散星团B型光谱变星的CCD搜寻。VII。NGC 1502
A CCD Search for Variable Stars of Spectral Type B in the Northern Hemisphere Open Clusters. VII. NGC 1502
摘要：
本文介绍了年轻疏散星团NGC 1502的光变研究结果。发现了八颗变星。在观测到的其他六颗被怀疑存在变异的恒星中，我们确认了两颗的变异，包括一颗β Cep恒星NGC 1502-26。其余四个嫌疑人被发现是恒定的，在我们的测光。此外，还获得了著名的大质量食双星SZ Cam的UBVI测光结果。新的变星包括：两个食双星，其中一个是一个相对明亮的分离系统，具有EA型光变曲线，一个α 2 CVn型变星，一个SPB候选者，一个RR型天琴座变星和其他三个未知来源的变星。其中两个的变化可能与它们的发射有关，这是通过在观测场的中心部分获得的57颗亮于V=16等的恒星的α指数测量的。另外，还发现了4颗发射为H α的非变星，并提供了V=17等以下恒星的VI测光和观测场中约50颗最亮恒星的UB测光。我们还表明，10万年的等时线非常适合所观察到的颜色星等图，如果采用的距离为1千秒差距和平均红化，E（V-I）=0.9等。
英文摘要：
We present results of variability search in the field of the young open cluster NGC 1502. Eight variable stars were discovered. Of six other stars in the observed field that were suspected for variability, we confirm variability of two, including one beta Cep star, NGC 1502-26. The remaining four suspects were found to be constant in our photometry. In addition, UBVI photometry of the well-known massive eclipsing binary SZ Cam was obtained. The new variable stars include: two eclipsing binaries of which one is a relatively bright detached system with an EA-type light curve, an alpha2 CVn-type variable, an SPB candidate, a field RR Lyrae star and three other variables showing variability of unknown origin. The variability of two of them is probably related to their emission in Halpha, which has been measured by means of the alpha index obtained for 57 stars brighter than V=16 mag in the central part of the observed field. Four other non-variable stars with emission in Halpha were also found. Additionally, we provide VI photometry for stars down to V=17 mag and UB photometry for about 50 brightest stars in the observed field. We also show that the 10-Myr isochrone fits very well the observed color-magnitude diagram if a distance of 1 kpc and mean reddening, E(V-I)=0.9 mag, are adopted.
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