We present the far-UV (FUV) photometry of images acquired with UVIT on AstroSat to probe the horizontal branch (HB) population of the Galactic globular cluster NGC 2298. UV-optical color–magnitude diagrams (CMDs) are constructed for member stars in combination with Hubble Space Telescope UV Globular Cluster Survey data for the central region and Gaia and ground-based photometric data for the outer region. A blue HB (BHB) sequence with a spread and four hot HB stars are detected in all FUV-optical CMDs and are compared with theoretical updated BaSTI isochrones and synthetic HB models with a range in helium abundance, suggesting that the hot HB stars are helium enhanced when compared to the BHB. The estimated effective temperature, radius, and luminosity of HB stars, using the best spectral energy distribution fits, were compared with various HB models. BHB stars span a temperature range from 7500 to 12,250 K. Three hot HB stars have 35,000–40,000 K, whereas one star has around ∼100,000 K. We suggest the following evolutionary scenarios: two stars are likely to be the progeny of extreme HB (EHB) stars formed through an early hot-flasher scenario, one is likely to be an EHB star with probable helium enrichment, and the hottest HB star, which is about to enter the white dwarf cooling phase, could have evolved from the BHB phase. Nevertheless, these are interesting spectroscopic targets to understand the late stages of evolution.
We present the first results of eight Globular Clusters (GCs) from the AstroSat/UVIT Legacy Survey program GlobULeS based on the observations carried out in two FUV filters (F148W and F169M). The FUV-optical and FUV-FUV colour-magnitude diagrams (CMDs) of GCs with the proper motion membership were constructed by combining the UVIT data with HST UV Globular Cluster Survey (HUGS) data for inner regions and Gaia Early Data Release (EDR3) for regions outside the HST’s field. We detect sources as faint as F148W ∼ 23.5 mag which are classified based on their locations in CMDs by overlaying stellar evolutionary models. The CMDs of 8 GCs are combined with the previous UVIT studies of 3 GCs to create stacked FUV-optical CMDs to highlight the features/peculiarities found in the different evolutionary sequences. The FUV (F148W) detected stellar populations of 11 GCs comprises 2,816 Horizontal Branch (HB) stars (190 Extreme HB candidates), 46 post-HB (pHB), 221 Blue Straggler Stars (BSS), and 107 White Dwarf (WD) candidates. We note that the blue HB colour extension obtained from F148W−G colour and the number of FUV detected EHB candidates are strongly correlated with the maximum internal Helium (He) variation within each GC, suggesting that FUV-optical plane is the most sensitive to He abundance variations in the HB. We discuss the potential science cases that will be addressed using these catalogues including HB morphologies, BSSs, pHB, and, WD stars.
Background: Attempts for Guinness world record have continued worldwide but these attempts were rarely aimed to promote public health. Diabetes is one of the rapidly growing lifestyle disorders in India which requires awareness reinforcements among the local population. In recent studies, Yoga has proved to be useful in lifestyle modification and Diabetes management. However, most individuals from rural and urban localities in the country are unaware of this fact. Purpose: The purpose was to organizing a nationwide attempt under the Niyantrit Madhumeh Bharat (NMB) programme to break the world record to be the largest Diabetes lesson, to spread awareness among general population. Methods: Present article represents the perspective of the Chandigarh chapter of NMB programme and its experience in Guinness world record attempt. Diabetes awareness lesson was organized in the city as per the standards defined by the Guinness Book and outcomes of the entire campaign were assessed at the end of the campaign. Result: Total 498 individuals participated in the campaign. Among them, 268 participants were questioned at the end of the campaign about the role of Yoga in Diabetes. 247 participants (92%) were agreed that Diabetes can be modified by Yoga and 9 participants (3%) disagreed. The remaining 12 participants (5%) did not give any response. Conclusion: We noticed that most of the participants became aware of the role of Yoga in Diabetes.
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