Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/7870
Title: UOCS. IV. discovery of diverse hot companions to blue stragglers in the old open cluster King 2
Authors: Jadhav, Vikrant V
Pandey, Sindhu
Subramaniam, A
Sagar, R
Keywords: Open star clusters
Blue straggler stars
Extreme horizontal branch stars
B subdwarf stars
Ultraviolet astronomy
Spectral energy distribution
Binary stars
Issue Date: Oct-2021
Publisher: Indian Academy of Sciences
Citation: Journal of Astrophysics and Astronomy, Vol. 42, No. 2, 89
Abstract: 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.
Description: Restricted Access
The original publication is available at springerlink.com
URI: http://hdl.handle.net/2248/7870
ISSN: 0973-7758
Appears in Collections:IIAP Publications

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