Vaidya, K and Panthi, A and Agarwal, M and Pandey, S and Rao, KK and Jadhav, V and Subramaniam, A (2022) UOCS-VII. Blue straggler populations of open cluster NGC 7789 with UVIT/AstroSat. In: Monthly Notices of the Royal Astronomical Society, 511 (2). pp. 2274-2284.
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Abstract
NGC 7789 is a �1.6 Gyr old, populous open cluster located at �2000 pc. We characterize the blue straggler stars (BSS) of this cluster using the Ultraviolet (UV) data from the UVIT/AstroSat. We present spectral energy distributions (SED) of 15 BSS candidates constructed using multiwavelength data ranging from UV to IR wavelengths. In 8 BSS candidates, a single temperature SED is found to be satisfactory. We discover hot companions in 5 BSS candidates. The hot companions with Teff �11750-15500 K, R �0.069-0.242 R·, and L �0.25-1.55 L·, are most likely extremely low mass (ELM) white dwarfs (WDs) with masses smaller than �0.18 M·, and thereby confirmed post mass transfer systems. We discuss the implication of this finding in the context of BSS formation mechanisms. Two additional BSS show excess in one or more UV filters, and may have a hot companion, however we are unable to characterize them. We suggest that at least 5 of the 15 BSS candidates (33 per cent) studied in this cluster have formed via the mass-transfer mechanism. © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.
| Item Type: | Journal Article |
|---|---|
| Publication: | Monthly Notices of the Royal Astronomical Society |
| Publisher: | Oxford University Press |
| Additional Information: | The copyright for this article belongs to Authors |
| Keywords: | Mass transfer, Blue stragglers; IR wavelengths; Low-mass; Most likely; Multiwavelength data; NGC 7789; Open clusters; Spectral energy distribution; Transfer systems; Ultraviolet data, White dwarfs |
| Department/Centre: | Division of Physical & Mathematical Sciences > Physics |
| Date Deposited: | 21 Mar 2022 07:36 |
| Last Modified: | 21 Mar 2022 07:36 |
| URI: | http://eprints.iisc.ac.in/id/eprint/71566 |
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