The horizontal branch morphology of the globular cluster NGC 1261 using AstroSat

被引：2
作者：
Rani, Sharmila [1 ,2 ]
Pandey, Gajendra [1 ]
Subramaniam, Annapurni [1 ]
Sahu, Snehalala [1 ]
Rao, N. Kameswara [1 ]
机构：
[1] Indian Inst Astrophys, Koramangala 2 Block, Bengaluru 560034, India
[2] Pondicherry Univ, Kalapet 605014, Puducherry, India
来源：
JOURNAL OF ASTROPHYSICS AND ASTRONOMY | 2020年 / 41卷 / 01期
关键词：
Galaxy: globular clusters: individual: NGC 1261; stars: horizontal-branch; stars: blue stragglers; stars: Hertzsprung-Russell and colour-magnitude diagrams; UV-BRIGHT STARS; STELLAR POPULATION; WHITE-DWARF; EVOLUTION;
D O I：
10.1007/s12036-020-09664-5
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present the results obtained from the UV photometry of the globular cluster NGC 1261 using far-UV (FUV) and near-UV (NUV) images acquired with the Ultraviolet Imaging Telescope (UVIT) on-board the AstroSat satellite. We utilized the UVIT data combined with HST, GAIA, and ground-based optical photometric data to construct the different UV colour-magnitude diagrams (CMDs). We detected blue HB (BHB), and two extreme HB (EHB) stars in FUV, whereas full HB, i.e., red HB (RHB), BHB as well as EHB is detected in NUV CMDs. The 2 EHB stars, identified in both NUV and FUV, are confirmed members of the cluster. The HB stars form a tight sequence in UV-optical CMDs, which is almost aligned with Padova isochrones. This study sheds light on the significance of UV imaging to probe the HB morphology in GCs.
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页数：6
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