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Title: UVIT open cluster study. I. Detection of a white dwarf companion to a blue straggler in M67: evidence of formation through mass transfer
Authors: Sindhu, N
Subramaniam, A
Jadhav, V.V
Chatterjee, Sourav
Geller, Aaron M
Knigge, Christian
Leigh, Nathan
Puzia, Thomas H
Shara, Michael
Simunovic, Mirko
Keywords: Open clusters and associations: individual (M67);Stars: individual (blue stragglers, white dwarfs);Ultraviolet: stars
Issue Date: 1-Sep-2019
Publisher: IOP Publishing
Citation: The Astrophysical Journal, Vol. 882, No. 1, 43
Abstract: The old open cluster M67, populated with blue straggler stars (BSSs), is a well-known test bed to study the BSS formation pathways. Here, we report the first direct detection of a white dwarf (WD) companion to a BSS in M67, using far-UV images from the Ultra-Violet Imaging telescope on ASTROSAT. Near-simultaneous observations in three far-UV bands combined with Galaxy Evolution Explorer, International Ultraviolet Explorer, and ground- and space-based photometric data covering a 0.14–11.5 μm range for WOCS1007 were found to require a binary fit to its spectral energy distribution (SED), consisting of a BSS and a hot companion. On the other hand, a single spectral fit was found to be satisfactory for the SEDs of two other BSSs, WOCS1006 and WOCS2011, with the latter showing a deficient far-UV flux.
Description: Restricted Access
ISSN: 0004-637X
???metadata.dc.rights???: © The American Astronomical Society
Appears in Collections:IIAP Publications

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