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The Color-Magnitude Diagram of the Globular Cluster NGC 6362 and the Canonical Tilt of Horizontal Branches

机译:球状星团NGC 6362的色度图和水平分支的典型倾斜

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In this paper we present new and accurate photometry for stars in the Galactic globular cluster NGC 6362. The color-magnitude diagram discloses two peculiarities in the distribution of stars: (1) a slightly tilted horizontal branch (HB) (Δ = 0.1 mag) and (2) a clump of stars near the red edge of the HB. We perform a detailed comparison with theoretical stellar models in both the HB and red giant branch (RGB) phases. It appears that in the moderately metal rich NGC 6362 the tilted HB can be explained as a natural product of canonical evolutionary theories, being a consequence of the minimum in the bolometric correction near 7500 K. We also investigate the effect of decreasing the efficiency of convective transport in stars climbing the RGB. Adopting Z = 0.002 and Y = 0.23, and performing a global fitting with the theoretical isochrones and zero-age HB, an age of 12 ± 1 Gyr is found, together with (m - M)V = 14.68 and E(B-V) = 0.08.
机译:在本文中,我们为银河系球状星团NGC 6362中的恒星提供了新的准确的测光法。色度图揭示了恒星分布的两个特点:(1)略微倾斜的水平分支(HB)(Δ= 0.1 mag) (2)HB红色边缘附近的一团星星。我们在HB和红巨星分支(RGB)阶段与理论恒星模型进行了详细的比较。似乎在中等金属含量的NGC 6362中,倾斜的HB可以解释为规范演化理论的自然产物,这是在7500 K附近进行的辐射热校正最小值的结果。我们还研究了降低对流效率的影响在攀登RGB的恒星中运输。采用Z = 0.002和Y = 0.23,并用理论等时线和零年龄HB进行全局拟合,发现年龄为12±1 Gyr,以及(m-M)V = 14.68和E(BV)= 0.08。

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