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首页> 外文期刊>The Astrophysical journal >VARIABLE STARS IN METAL-RICH GLOBULAR CLUSTERS. IV. LONG-PERIOD VARIABLES IN NGC 6496
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VARIABLE STARS IN METAL-RICH GLOBULAR CLUSTERS. IV. LONG-PERIOD VARIABLES IN NGC 6496

机译:富含金属的球团中的变星。 IV。 NGC 6496中的长周期变量

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We present VI-band photometry for stars in the metal-rich globular cluster NGC 6496. Our time-series data were cadenced to search for long-period variables (LPVs) over a span of nearly two years, and our variability search yielded the discovery of 13 new variable stars, of which 6 are LPVs, 2 are suspected LPVs, and 5 are short-period eclipsing binaries. An additional star was found in the ASAS database, and we clarify its type and period. We argue that all of the eclipsing binaries are field stars, while five to six of the LPVs are members of NGC 6496. We compare the period–luminosity distribution of these LPVs with those of LPVs in the Large Magellanic Cloud and 47 Tucanae, and with theoretical pulsation models. We also present a VI color–magnitude diagram, display the evolutionary states of the variables, and match isochrones to determine a reddening of and apparent distance modulus of mag.
机译:我们介绍了富含金属的球状星团NGC 6496中恒星的VI波段光度法。对我们的时间序列数据进行了节奏搜索,以搜索近两年内的长期变量(LPV),而我们的变异性搜索得出了这一发现13个新变星中,其中6个是LPV,2个是可疑LPV,还有5个是短周期日食双星。在ASAS数据库中发现了另外一个星号,我们对其类型和周期进行了说明。我们认为所有的日食双星都是场星,而5至6个LPV是NGC 6496的成员。我们比较了这些LPV与大麦哲伦云和47 Tucanae中LPV的周期-发光度分布。理论脉动模型。我们还提供了一个VI色阶图,显示变量的演化状态,并匹配等时线,以确定mag的发红和视距模量。

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