Sindhu, N and Subramaniam, A and Geller, AM and Jadhav, V and Knigge, C and Simunovic, M and Leigh, N and Shara, M and Puzia, TH (2019) Detection of White Dwarf companions to Blue Straggler Stars from UVIT observations of M67. In: Proceedings of the International Astronomical Union, May 2019, pp. 482-485.
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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 μm 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 MâŠwith Teff ~11000-24000 K. © International Astronomical Union 2020.
| Item Type: | Conference Paper |
|---|---|
| Publication: | Proceedings of the International Astronomical Union |
| Publisher: | Cambridge University Press |
| Additional Information: | The copyright of this article belongs to Cambridge University Press |
| Department/Centre: | Division of Physical & Mathematical Sciences > Joint Astronomy Programme Division of Physical & Mathematical Sciences > Physics |
| Date Deposited: | 01 Apr 2021 10:48 |
| Last Modified: | 01 Apr 2021 10:48 |
| URI: | http://eprints.iisc.ac.in/id/eprint/65100 |
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