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Constraints on blue straggler formation mechanisms in Galactic globular clusters from proper motion velocity distributions

Constraints on blue straggler formation mechanisms in Galactic globular clusters from proper motion velocity distributions
Constraints on blue straggler formation mechanisms in Galactic globular clusters from proper motion velocity distributions
For a sample of 38 Galactic globular clusters (GCs), we confront the observed distributions of blue straggler (BS) proper motions and masses (derived from isochrone fitting) from the BS catalog of Simunovic & Puzia with theoretical predictions for each of the two main competing BS formation mechanisms. These are mass transfer from an evolved donor on to a main-sequence (MS) star in a close binary system, and direct collisions involving MS stars during binary encounters. We use the \texttt{FEWBODY} code to perform simulations of single-binary and binary-binary interactions. This provides collisional velocity and mass distributions for comparison to the observed distributions. Most clusters are consistent with BSs derived from a dynamically relaxed population, supportive of the binary mass-transfer scenario. In a few clusters, including all the post-core collapse clusters in our sample, the collisional velocities provide the best fit.
astro-ph.SR, astro-ph.GA
0035-8711
231-239
Leigh, N.W.C.
ad7c512f-32a8-43c3-83aa-7eb487f4112c
Panurach, T.
89a255c6-5e8d-4711-a086-d4c479a1f21f
Simunovic, M.
73350eb7-7456-444e-965b-f3c7a85f5366
Geller, A. M.
358fcd0f-def3-47e2-8595-ab16cdb12f3a
Zurek, D.
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Shara, M. M.
70d52b90-8ede-49b6-95fe-738e1b9f2ea9
Sills, A.
7b27ed2e-cb6f-4a04-9957-9d3d3bd5c4d3
Knigge, C.
ac320eec-631a-426e-b2db-717c8bf7857e
Gosnell, N.M.
ca36477c-cf40-44c0-a70e-b4921b383780
Mathieu, R.
f8406264-e1b5-41be-9074-b612cd9e967f
Puzia, T.H.
b625d688-ed67-462d-9691-6e7f9b69807b
Ventura, J.
62a2540e-056e-4389-97d1-649d31959beb
Minor, Q.
de14fbb7-ebd7-4e75-9991-b4cbf5804923
Leigh, N.W.C.
ad7c512f-32a8-43c3-83aa-7eb487f4112c
Panurach, T.
89a255c6-5e8d-4711-a086-d4c479a1f21f
Simunovic, M.
73350eb7-7456-444e-965b-f3c7a85f5366
Geller, A. M.
358fcd0f-def3-47e2-8595-ab16cdb12f3a
Zurek, D.
0de59032-c43c-4c8f-89a2-b451488b86db
Shara, M. M.
70d52b90-8ede-49b6-95fe-738e1b9f2ea9
Sills, A.
7b27ed2e-cb6f-4a04-9957-9d3d3bd5c4d3
Knigge, C.
ac320eec-631a-426e-b2db-717c8bf7857e
Gosnell, N.M.
ca36477c-cf40-44c0-a70e-b4921b383780
Mathieu, R.
f8406264-e1b5-41be-9074-b612cd9e967f
Puzia, T.H.
b625d688-ed67-462d-9691-6e7f9b69807b
Ventura, J.
62a2540e-056e-4389-97d1-649d31959beb
Minor, Q.
de14fbb7-ebd7-4e75-9991-b4cbf5804923

Leigh, N.W.C., Panurach, T., Simunovic, M., Geller, A. M., Zurek, D., Shara, M. M., Sills, A., Knigge, C., Gosnell, N.M., Mathieu, R., Puzia, T.H., Ventura, J. and Minor, Q. (2019) Constraints on blue straggler formation mechanisms in Galactic globular clusters from proper motion velocity distributions. Monthly Notices of the Royal Astronomical Society, 482 (1), 231-239. (doi:10.1093/mnras/sty2707).

Record type: Article

Abstract

For a sample of 38 Galactic globular clusters (GCs), we confront the observed distributions of blue straggler (BS) proper motions and masses (derived from isochrone fitting) from the BS catalog of Simunovic & Puzia with theoretical predictions for each of the two main competing BS formation mechanisms. These are mass transfer from an evolved donor on to a main-sequence (MS) star in a close binary system, and direct collisions involving MS stars during binary encounters. We use the \texttt{FEWBODY} code to perform simulations of single-binary and binary-binary interactions. This provides collisional velocity and mass distributions for comparison to the observed distributions. Most clusters are consistent with BSs derived from a dynamically relaxed population, supportive of the binary mass-transfer scenario. In a few clusters, including all the post-core collapse clusters in our sample, the collisional velocities provide the best fit.

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1810.01895v1 - Accepted Manuscript
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Accepted/In Press date: 3 October 2018
e-pub ahead of print date: 9 October 2018
Published date: January 2019
Keywords: astro-ph.SR, astro-ph.GA

Identifiers

Local EPrints ID: 425548
URI: https://eprints.soton.ac.uk/id/eprint/425548
ISSN: 0035-8711
PURE UUID: 0ae4b542-426a-45f4-acaf-5f7e02b2f882

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Date deposited: 24 Oct 2018 16:30
Last modified: 13 Mar 2019 17:55

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