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.
引用
收藏
页数：6
相关论文
共 50 条
  • [21] Rotation of hot horizontal-branch stars in the globular clusters NGC 1904, NGC 2808, NGC 6093, and NGC 7078
    Recio-Blanco, A
    Piotto, G
    Aparicio, A
    Renzini, A
    ASTROPHYSICAL JOURNAL, 2002, 572 (01) : L71 - L74
  • [22] Blue horizontal branch globular clusters towards the bulge: Terzan 9, NGC 6139 and NGC 6453
    Ortolani, S
    Bica, E
    Barbuy, B
    ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES, 1999, 138 (02): : 267 - 273
  • [23] Helium variation due to self-pollution among Globular Cluster stars -: Consequences on the horizontal branch morphology
    D'Antona, F
    Caloi, V
    Montalbán, J
    Ventura, P
    Gratton, R
    ASTRONOMY & ASTROPHYSICS, 2002, 395 (01) : 69 - 75
  • [24] Rotation velocities of hot horizontal branch stars in the globular clusters NGC 1904, NGC 2808, NGC 6093, and NGC 7078: The database
    Recio-Blanco, A
    Piotto, G
    Aparicio, A
    Renzini, A
    ASTRONOMY & ASTROPHYSICS, 2004, 417 (02): : 597 - 604
  • [25] Integrated colours of Milky Way globular clusters and horizontal branch morphology
    Smith, G. H.
    Strader, J.
    ASTRONOMISCHE NACHRICHTEN, 2007, 328 (02) : 107 - 125
  • [26] An abundance analysis for five red horizontal-branch stars in the extremely metal-rich globular cluster NGC 6553
    Cohen, JG
    Gratton, RG
    Behr, BB
    Carretta, E
    ASTROPHYSICAL JOURNAL, 1999, 523 (02) : 739 - 751
  • [27] Blue horizontal branch stars in metal-rich globular clusters I. NGC 6388 and NGC 6441
    Moehler, S
    Sweigart, AV
    Catelan, M
    ASTRONOMY & ASTROPHYSICS, 1999, 351 (02): : 519 - 525
  • [28] Horizontal-branch morphology and dense environments. Hubble Space Telescope observations of globular clusters NGC 2298, 5897, 6535, and 6626
    Testa, V
    Corsi, CE
    Andreuzzi, G
    Iannicola, G
    Marconi, G
    Piersimoni, AM
    Buonanno, R
    ASTRONOMICAL JOURNAL, 2001, 121 (02) : 916 - 934
  • [29] Lithium abundances as a tracer of asymptotic giant branch star pollution in the globular cluster NGC 6752
    Schiappacasse-Ulloa, J.
    Lucatello, Sara
    Rain, M. J.
    Pietrinferni, Adriano
    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2022, 511 (01) : 231 - 240
  • [30] Investigation of the globular cluster NGC 2808 with the Ultra-Violet Imaging Telescope
    Jain, Rashi
    Vig, S.
    Ghosh, S. K.
    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2019, 485 (02) : 2877 - 2888
12345