Fast-rotating Blue Straggler Stars in the Globular Cluster NGC 3201*

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dc.citation.articleNumber124en_US
dc.citation.journalTitleThe Astrophysical Journalen_US
dc.citation.volumeNumber956en_US
dc.contributor.authorBilli, Alexen_US
dc.contributor.authorFerraro, Francesco R.en_US
dc.contributor.authorMucciarelli, Alessioen_US
dc.contributor.authorLanzoni, Barbaraen_US
dc.contributor.authorCadelano, Marioen_US
dc.contributor.authorMonaco, Lorenzoen_US
dc.contributor.authorMateo, Marioen_US
dc.contributor.authorBailey, John I.en_US
dc.contributor.authorReiter, Meganen_US
dc.contributor.authorOlszewski, Edward W.en_US
dc.date.accessioned2024-05-08T18:56:11Zen_US
dc.date.available2024-05-08T18:56:11Zen_US
dc.date.issued2023en_US
dc.description.abstractWe used high-resolution spectra acquired with the Magellan Telescope to measure radial and rotational velocities of approximately 200 stars in the Galactic globular cluster NGC 3201. The surveyed sample includes blue straggler stars (BSSs) and reference stars in different evolutionary stages (main-sequence turnoff, subgiant, red giant, and asymptotic giant branches). The average radial velocity value (〈V r 〉 = 494.5 ± 0.5 km s−1) confirms a large systemic velocity for this cluster and was used to distinguish 33 residual field interlopers. The final sample of member stars has 67 BSSs and 114 reference stars. Similarly to what is found in other clusters, the totality of the reference stars has negligible rotation (< 20 km s−1), while the BSS rotational velocity distribution shows a long tail extending up to ∼200 km s−1, with 19 BSSs (out of 67) spinning faster than 40 km s−1. This sets the percentage of fast-rotating BSSs to ∼28%. Such a percentage is roughly comparable to that measured in other loose systems (ω Centauri, M4, and M55) and significantly larger than that measured in high-density clusters (as 47 Tucanae, NGC 6397, NGC 6752, and M30). This evidence supports a scenario where recent BSS formation (mainly from the evolution of binary systems) is occurring in low-density environments. We also find that the BSS rotational velocity tends to decrease for decreasing luminosity and surface temperature, similarly to what is observed in main-sequence stars. Hence, further investigations are needed to understand the impact of BSS internal structure on the observed rotational velocities.en_US
dc.identifier.citationBilli, A., Ferraro, F. R., Mucciarelli, A., Lanzoni, B., Cadelano, M., Monaco, L., Mateo, M., Bailey, J. I., Reiter, M., & Olszewski, E. W. (2023). Fast-rotating Blue Straggler Stars in the Globular Cluster NGC 3201*. The Astrophysical Journal, 956(2), 124. https://doi.org/10.3847/1538-4357/acf372en_US
dc.identifier.digitalBilli_2023_ApJ_956_124en_US
dc.identifier.doihttps://doi.org/10.3847/1538-4357/acf372en_US
dc.identifier.urihttps://hdl.handle.net/1911/115678en_US
dc.language.isoengen_US
dc.publisherIOP Publishing Ltden_US
dc.rightsExcept where otherwise noted, this work is licensed under a Creative Commons Attribution (CC BY) license. Permission to reuse, publish, or reproduce the work beyond the terms of the license or beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en_US
dc.titleFast-rotating Blue Straggler Stars in the Globular Cluster NGC 3201*en_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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