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    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/joaa/041/0035

    • Keywords

       

      Galaxy: globular clusters: individual: NGC 1261; stars: horizontal-branch; stars: blue stragglers; stars: Hertzsprung–Russell and colour-magnitude diagrams.

    • Abstract

       

      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) onboard 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 confirmedmembers 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.

    • Author Affiliations

       

      SHARMILA RANI1 2 GAJENDRA PANDEY1 ANNAPURNI SUBRAMANIAM1 SNEHALALA SAHU1 N. KAMESWARA RAO1

      1. Indian Institute of Astrophysics, Koramangala II Block, Bengaluru 560 034, India.
      2. Pondicherry University, R.V. Nagar, Kalapet, Puducherry 605 014, India.

    • Dates

       
      Published
      11 December 2020
      Manuscript received
      6 September 2020
      Accepted
      24 September 2020
      Final version published online
      11 December 2020

  • Journal of Astrophysics and Astronomy | News

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      Posted on January 27, 2016

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