Abstract
We present far ultraviolet (FUV) observations of globular cluster NGC 4147 using three FUV filters, BaF\(_2\) (F154W), sapphire (F169M), and silica (F172M) of Ultra-Violet Imaging Telescope (UVIT) on-board the AstroSat satellite. We confirmed the cluster membership of the UVIT observed sources using proper motions from Gaia data release 2 (GAIA DR2). We identified 37 blue horizontal branch stars (BHBs), one blue straggler star (BSS) and 15 variable stars using UV-optical color magnitude diagrams (CMDs). We find that all the FUV bright BHBs are second generation population stars. Using UV-optical CMDs, we identify two sub-populations, BHB1 and BHB2, among the UV-bright BHBs in the cluster with stars count ratio of 24:13 for BHB1 and BHB2. The effective temperatures (\(T_{\mathrm {eff}}\)) of BHB1 and BHB2 were derived using color-temperature relation of BaSTI-IAC zero-age horizontal branch (ZAHB). We found that BHB1 stars are more centrally concentrated than BHB2 stars. We also derive physical parameters of the detected FUV bright BSS by fitting younger age BaSTI-IAC isochrones on optical and UV-optical CMDs.
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Acknowledgements
We would like to thank the referee for her/his valuable suggestions and comments. RK would like to acknowledge CSIR Research Fellowship (JRF) Grant No.09/983(0034)/2019-EMR-1 for the financial support. ACP would like to acknowledge the support by Indian Space Research Organization, Department of Space, Government of India (ISRO RESPOND Project No. ISRO/RES/2/409/17-18). ACP thanks Inter-University Centre for Astronomy and Astrophysics (IUCAA), Pune, India for providing facilities to carry out his work. DKO acknowledges the support of the Department of Atomic Energy, Government of India, under Project Identification No. RTI 4002. AM thanks DST-INSPIRE (IF150845) for the funding. This publication uses the data from the AstroSat mission of the Indian Space Research Organisation (ISRO), archived at the Indian Space Science Data Center (ISSDC). The UVIT data used here was processed by the Payload Operations Centre at IIA. The UVIT is built in collaboration between IIA, IUCAA, TIFR, ISRO and CSA.
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This article is part of the Special Issue on “AstroSat: Five Years in Orbit”.
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Kumar, R., Pradhan, A.C., Parthasarathy, M. et al. UVIT study of UV bright stars in the globular cluster NGC 4147. J Astrophys Astron 42, 36 (2021). https://doi.org/10.1007/s12036-020-09687-y
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DOI: https://doi.org/10.1007/s12036-020-09687-y