Subramaniam, A and Pandey, S and Jadhav, VV and Sahu, S (2020) UVIT/AstroSat studies of blue straggler stars and post-mass transfer systems in star clusters: detection of one more blue lurker in M67. In: Journal of Astrophysics and Astronomy, 41 (1).
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Abstract
The blue straggler stars (BSSs) are main-sequence (MS) stars, which have evaded stellar evolution by acquiring mass while on the MS. The detection of extremely low mass (ELM) white dwarf (WD) companions to two BSSs and one yellow straggler star (YSS) from our earlier study using UVIT/AstroSat, as well as WD companions to main-sequence stars (known as blue lurkers) suggest a good fraction of post-mass transfer binaries in M67. Using deeper UVIT observations, here we report the detection of another blue lurker in M67, with an ELM WD companion. The post-mass transfer systems with the presence of ELM WDs, including BSSs, are formed from Case A/B mass transfer and are unlikely to show any difference in surface abundances. We find a correlation between the temperature of the WD and the vsini of the BSSs. We also find that the progenitors of the massive WDs are likely to belong to the hot and luminous group of BSSs in M67. The only detected BSS+WD system by UVIT in the globular cluster NGC 5466 has a normal WD and suggests that open cluster like environment might be present in the outskirts of low density globular clusters. © 2020, Indian Academy of Sciences.
| Item Type: | Journal Article |
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| Publication: | Journal of Astrophysics and Astronomy |
| Publisher: | Springer |
| Additional Information: | The copyright for this article belongs to the Author(s). |
| Keywords: | Blue stragglers; open clusters and associations: individual:M67; stars: rotation; ultraviolet: stars; white dwarfs |
| Department/Centre: | Division of Physical & Mathematical Sciences > Joint Astronomy Programme Division of Physical & Mathematical Sciences > Physics |
| Date Deposited: | 09 Jan 2023 12:06 |
| Last Modified: | 09 Jan 2023 12:06 |
| URI: | https://eprints.iisc.ac.in/id/eprint/78964 |
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