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UOCS. IV. Discovery of diverse hot companions to blue stragglers in the old open cluster King 2

Jadhav, VV and Pandey, S and Subramaniam, A and Sagar, R (2021) UOCS. IV. Discovery of diverse hot companions to blue stragglers in the old open cluster King 2. In: Journal of Astrophysics and Astronomy, 42 (2).

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Official URL: https://doi.org/10.1007/s12036-021-09746-y


King 2, one of the oldest clusters in the Milky Way, with an age of � 6 Gyr and distance of � 5700 pc, has been observed with UVIT payload on the AstroSat. With membership information derived from Gaia EDR3, the cluster is found to have 39 blue straggler stars (BSSs). We created multi-wavelength spectra-energy distributions (SED) of all the BSSs. Out of 10 UV detected BSSs, 6 bright ones were fitted with double component SEDs and were found to have hotter companions with properties similar to extreme horizontal branch (EHB)/subdwarf B (sdB) stars, with a range in luminosity and temperature, suggesting a diversity among the hot companions. We suggest that at least 15 of BSSs in this cluster are formed via mass-transfer pathway. When we compared their properties to EHBs and hotter companions to BSS in open and globular clusters, we suggest that EHB/sdBs like companions can form in binaries of open clusters as young as 6 Gyr. © 2021, Indian Academy of Sciences.

Item Type: Journal Article
Publication: Journal of Astrophysics and Astronomy
Publisher: Springer
Additional Information: The copyright for this article belongs to Authors
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 21 Sep 2021 09:31
Last Modified: 21 Sep 2021 09:31
URI: http://eprints.iisc.ac.in/id/eprint/69756

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