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arXiv 0709.3484astro-ph
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疏散星团深MMT凌日巡天M37 II:变星

Deep MMT Transit Survey of the Open Cluster M37 II: Variable Stars

J. D. Hartman, B. S. Gaudi, M. J. Holman, B. A. McLeod, K. Z. Stanek, J. A. Barranco, M. H. Pinsonneault, J. S. Kalirai

摘要:

我们利用6.5米多镜望远镜(MMT)上的Megacam宽视场镶嵌CCD相机对疏散星团M37(NGC 2099)的中间年龄凌日行星进行了深($15 \la r \la 23$)20夜巡天。在本文中,我们提出了一个目录和光变曲线的1445变星,其中1430(99%)是新发现的。我们发现了20个新的食双星和31个新的短周期($P < 1 {\rm day}$)脉动星。大部分变星很可能是快速旋转的年轻低质量恒星,包括相当数量的星团成员($\ga 500$)。我们确定和分析了五个特别有趣的个体变量,包括一个先前确定的变量,我们认为它可能是一个混合$γ$剑鱼座/ $δ$盾牌座变星,两个可能的静态激变变量,一个分离的食双星(DEB),至少有一个$γ$剑鱼座脉动组件(只有第二个这样的变星在食双星发现),和一个低质量($M_{P} \sim M_{S} \sim 0.6 M_{\odot}$)DEB,这是一个可能的集群成员。DEB+ $γ$ Doradus系统的物理参数的初步确定产生$M_{P} = 1.58 \pm 0.04 M_{\odot}$、$M_{S} = 1.58 \pm 0.04 M_{\odot}$、$R_{P} = 1.39 \pm 0.07 R_{\odot}$和$R_{S} = 1.38 \pm 0.07 R_{\odot}$。

英文摘要:

We have conducted a deep ($15 \la r \la 23$), 20 night survey for transiting planets in the intermediate age ($\sim 550 {\rm Myr}$) open cluster M37 (NGC 2099) using the Megacam wide-field mosaic CCD camera on the 6.5m Multiple Mirror Telescope (MMT). In this paper we present a catalog and light curves for 1445 variable stars; 1430 (99%) of these are new discoveries. We have discovered 20 new eclipsing binaries and 31 new short period ($P < 1 {\rm day}$) pulsating stars. The bulk of the variables are most likely rapidly rotating young low-mass stars, including a substantial number ($\ga 500$) that are members of the cluster. We identify and analyze five particularly interesting individual variables including a previously identified variable which we suggest is probably a hybrid $γ$ Doradus/$δ$ Scuti pulsator, two possible quiescent cataclysmic variables, a detached eclipsing binary (DEB) with at least one $γ$ Doradus pulsating component (only the second such variable found in an eclipsing binary), and a low mass ($M_{P} \sim M_{S} \sim 0.6 M_{\odot}$) DEB that is a possible cluster member. A preliminary determination of the physical parameters for the DEB+$γ$ Doradus system yields $M_{P} = 1.58 \pm 0.04 M_{\odot}$, $M_{S} = 1.58 \pm 0.04 M_{\odot}$, $R_{P} = 1.39 \pm 0.07 R_{\odot}$ and $R_{S} = 1.38 \pm 0.07 R_{\odot}$.

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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