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UOCS – VII. Blue straggler populations of open cluster NGC 7789 with UVIT/AstroSat

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dc.contributor.author Vaidya, Kaushar,et.al.
dc.contributor.author Pandey, Sindhu
dc.date.accessioned 2024-05-20T06:42:37Z
dc.date.available 2024-05-20T06:42:37Z
dc.date.issued 2022-04
dc.identifier.uri https://doi.org/10.1093/mnras/stac207
dc.identifier.uri http://localhost:8080/xmlui/handle/123456789/1628
dc.description.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. en_US
dc.language.iso en en_US
dc.publisher Monthly Notices of the Royal Astronomical Society en_US
dc.relation.ispartofseries 1844;mn511-2274
dc.subject blue stragglers en_US
dc.title UOCS – VII. Blue straggler populations of open cluster NGC 7789 with UVIT/AstroSat en_US
dc.type Article en_US


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