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Detection of white dwarf companions to blue straggler stars from UVIT observations of M67

Detection of white dwarf companions to blue straggler stars from UVIT observations of M67
Detection of white dwarf companions to blue straggler stars from UVIT observations of M67
We investigate the old open cluster M67 using ultraviolet photometric data of Ultra-Violet Imaging Telescope in multi-filter far-UV bands. M67, well known for the presence of several blue straggler stars (BSS), has been put to detailed tests to understand their formation pathways. Currently, there are three accepted formation channels: mass transfer due to Roche-lobe overflow in binary systems, stellar mergers either due to dynamical collisions or through coalescence of close binaries. So far, there had not been any confirmed detection of a white dwarf (WD) companion to any of the BSSs in this cluster. Here, we present the detection of WD companions to 5 bright BSSs in M67. The multiwavelength spectral energy distributions covering 0.12 -11.5 $\mu$m range, were found to require binary spectral fits for 5 BSSs, consisting of a cool (BSS) and a hot companion. The parameters (Luminosity, Temperature, Radius and Mass) of the hot companions suggest them to be WDs with mass in the range 0.2 - 0.35 M$_{\odot}$ with T$_{eff}$ $\sim$ 11000 - 24000 K.
astro-ph.SR, astro-ph.GA
1-4
Sindhu, N
317ad9d0-998f-416a-9033-c57572df15c4
Subramaniam, Annapurni
6a91cb92-e7e8-40cb-b457-cc5abac5e924
Geller, Aaron M
358fcd0f-def3-47e2-8595-ab16cdb12f3a
Jadhav, Vikrant
7a9cc29e-74ab-4d79-8c16-3ac2b057feb1
Knigge, Christian
ac320eec-631a-426e-b2db-717c8bf7857e
Simunovic, Mirko
ce9a236f-751d-49c4-90e9-b53fa8a6a028
Leigh, Nathan
90069e68-a317-4cce-92e3-2401e3518751
Shara, Michael
bac39df6-4548-4335-a751-9be1122e8c33
Puzia, Thomas H
b625d688-ed67-462d-9691-6e7f9b69807b
Sindhu, N
317ad9d0-998f-416a-9033-c57572df15c4
Subramaniam, Annapurni
6a91cb92-e7e8-40cb-b457-cc5abac5e924
Geller, Aaron M
358fcd0f-def3-47e2-8595-ab16cdb12f3a
Jadhav, Vikrant
7a9cc29e-74ab-4d79-8c16-3ac2b057feb1
Knigge, Christian
ac320eec-631a-426e-b2db-717c8bf7857e
Simunovic, Mirko
ce9a236f-751d-49c4-90e9-b53fa8a6a028
Leigh, Nathan
90069e68-a317-4cce-92e3-2401e3518751
Shara, Michael
bac39df6-4548-4335-a751-9be1122e8c33
Puzia, Thomas H
b625d688-ed67-462d-9691-6e7f9b69807b

Sindhu, N, Subramaniam, Annapurni, Geller, Aaron M, Jadhav, Vikrant, Knigge, Christian, Simunovic, Mirko, Leigh, Nathan, Shara, Michael and Puzia, Thomas H (2019) Detection of white dwarf companions to blue straggler stars from UVIT observations of M67. In, IAU Symposium No. 351 proceedings - Star Clusters: From the Milky Way to the Early Universe, 2019. (IAU Conference Series, 351) Star Clusters: from the Milky Way to the Early Universe (27/05/19 - 31/05/19) pp. 1-4. (doi:10.1017/S1743921319006975).

Record type: Book Section

Abstract

We investigate the old open cluster M67 using ultraviolet photometric data of Ultra-Violet Imaging Telescope in multi-filter far-UV bands. M67, well known for the presence of several blue straggler stars (BSS), has been put to detailed tests to understand their formation pathways. Currently, there are three accepted formation channels: mass transfer due to Roche-lobe overflow in binary systems, stellar mergers either due to dynamical collisions or through coalescence of close binaries. So far, there had not been any confirmed detection of a white dwarf (WD) companion to any of the BSSs in this cluster. Here, we present the detection of WD companions to 5 bright BSSs in M67. The multiwavelength spectral energy distributions covering 0.12 -11.5 $\mu$m range, were found to require binary spectral fits for 5 BSSs, consisting of a cool (BSS) and a hot companion. The parameters (Luminosity, Temperature, Radius and Mass) of the hot companions suggest them to be WDs with mass in the range 0.2 - 0.35 M$_{\odot}$ with T$_{eff}$ $\sim$ 11000 - 24000 K.

Text
1908.01573v1 - Accepted Manuscript
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More information

Published date: 5 August 2019
Additional Information: 4 pages, 2 figures, to appear in IAU Symposium No. 351 proceedings - Star Clusters: From the Milky Way to the Early Universe, 2019
Venue - Dates: Star Clusters: from the Milky Way to the Early Universe, , Bologna, Italy, 2019-05-27 - 2019-05-31
Keywords: astro-ph.SR, astro-ph.GA

Identifiers

Local EPrints ID: 433869
URI: http://eprints.soton.ac.uk/id/eprint/433869
PURE UUID: 84220666-0367-4ba7-8ff2-969a39bc76e7

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Date deposited: 05 Sep 2019 16:30
Last modified: 21 Nov 2021 17:55

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Contributors

Author: N Sindhu
Author: Annapurni Subramaniam
Author: Aaron M Geller
Author: Vikrant Jadhav
Author: Mirko Simunovic
Author: Nathan Leigh
Author: Michael Shara
Author: Thomas H Puzia

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