疏散星团伯克利8的CCD UBVRI光度测定

IF 1.4 Q3 PHYSICS, MULTIDISCIPLINARY

Turkish Journal of Physics Pub Date : 2019-08-15 DOI:10.3906/fiz-1906-6

Hikmet cCakmak, R. Michel, Yuksel Karatacs

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引用次数: 0

摘要

利用内华达山脉天文台0.90米望远镜拍摄的CCD UBVRI光度数据，分析了研究较少的伯克利8 (Be8)疏散星团。Z = +0.008 PARSEC等时线给出了E(B-V) = 0.69 +- 0.03的变红，距离为3410 +- 300pc，年龄为2.8 +- 0.2 Gyr。它的中位数Gaia DR2距离d = 3676 +- 810 pc与我们的光度距离3410 - 3620 pc在不确定度内很好地吻合。轨道为圆形，ecc =[0.23, 0.30]的5个可能的Be 8成员的运动学参数反映了银河系薄盘的性质，这也与预期的金属含量([M/H] = -0.27)一致。r> 9 kpc的Be8(共旋转间隙为9 kpc)可能来自不同的星系半径或不同的恒星形成区域。

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CCD UBVRI photometry of the open cluster Berkeley 8

The poorly studied Berkeley 8 (Be8) open cluster is analysed from CCD UBVRI photometric data taken with the 0.90 m telescope at the Sierra Nevada Observatory. The Z = +0.008 PARSEC isochrone gave us a reddening of E(B-V) = 0.69 +- 0.03, a distance of 3410 +- 300 pc and an age of 2.8 +- 0.2 Gyr. Its median Gaia DR2 distance, d = 3676 +- 810 pc is in good agreement with our photometric distances, 3410 - 3620 pc within the uncertainties. The kinematic parameters of five likely members of Be 8 with the circular orbits, ecc = [0.23, 0.30] reflect the properties of the Galactic thin disc, which is also consistent with what is expected of its metal content ([M/H] = -0.27). Be8 with R > 9 kpc (co-rotation gap at 9 kpc) may have been originating from different galactic radius or different star formation region.

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来源期刊

Turkish Journal of Physics PHYSICS, MULTIDISCIPLINARY-

CiteScore

3.50

自引率

0.00%

发文量

期刊介绍： The Turkish Journal of Physics is published electronically 6 times a year by the Scientific and Technological Research Council of Turkey (TÜBİTAK) and accepts English-language manuscripts in various fields of research in physics, astrophysics, and interdisciplinary topics related to physics. Contribution is open to researchers of all nationalities.