A PROBABLE HYBRID γ DOR–δ SCUTI VARIABLE DISCOVERED IN THE OPEN CLUSTER NGC 2126
A PROBABLE HYBRID γ DOR–δ SCUTI VARIABLE DISCOVERED IN THE OPEN CLUSTER NGC 2126
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DOI：
10.1088/0004-6256/144/5/141
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发表时间：
2012-10
期刊：
影响因子：
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通讯作者：
Xiao-Bin Zhang;Liu Deng;Chongguang Luo
中科院分区：
文献类型：
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作者：
Xiao-Bin Zhang;Liu Deng;Chongguang Luo
利用高精度的B和V波段时间序列CCD测光研究了中等年龄疏散星团NGC 2126中振荡EA型双星系统的物理性质。对这一领域约500颗恒星的光变进行分析，发现了三颗新的变星，两颗脉动星和一颗EA型食双星。前者之一，GSC 3382 -0957，一个可能的集群成员，显示有p-和g-模式脉动。频率分析揭示了来自B和V波段数据的两个置信脉动模式，f1 = 14.835 c/d和f2 = 1.812 c/d。在色星等图中，这颗星星位于盾牌座δ不稳定带的下边缘，这里是盾牌座δ和盾牌座γ星重叠的地方。据推测，这可能是一颗γ Dor-δ Sct混合星星。
We have carried out high-precision B- and V-band time-series CCD photometry to investigate the physical nature of an oscillating EA-type binary system in the intermediate-age open cluster NGC 2126. Analysis of the light variability for about 500 stars in this field has led to the discovery of three new variables, two pulsating stars and one EA-type eclipsing binary. One of the former, GSC3382-0957, a probable cluster member, is shown to have both p- and g-mode pulsations. A frequency analysis reveals two confident pulsating modes at f1 = 14.835 c/d and f2 = 1.812 c/d from both the B- and V-band data. In the color–magnitude diagram, the star is located at the lower edge of the δ Scuti instability strip, where the δ Sct and γ Dor stars overlap. It is suggested that this is a probable hybrid γ Dor–δ Sct star.