Far-ultraviolet investigation into the galactic globular cluster M30 (NGC 7099): I. Photometry and radial distributions
Far-ultraviolet investigation into the galactic globular cluster M30 (NGC 7099): I. Photometry and radial distributions
We present a far-ultraviolet (FUV) study of the globular cluster M30 (NGC 7099). The images were obtained using the Advanced Camera for Surveys (ACS/SBC, F150LP, FUV) and the Wide Field Planetary Camera 2 (WFPC2, F300W, UV) which were both onboard the Hubble Space Telescope. The FUV - UV colour-magnitude diagram (CMD) shows a main sequence (MS) turnoff at FUV ≈ 22 mag and $FUV-UV\, \approx 3$ mag. The MS extends 4 mag below the turnoff, and a prominent horizontal branch (HB) and blue straggler (BS) sequence can be seen. A total of 1218 MS stars, 185 red giant branch stars, 47 BS stars, and 41 HB stars are identified, along with 78 sources blueward of the MS which consist of white dwarfs (WDs) and objects in the gap between the WDs and the MS that include potential cataclysmic variable (CV) candidates. The radial distribution of the BS population is concentrated towards the cluster centre, indicating that mass segregation has occurred. The blue and red sub-populations of the double BS sequence appear mixed in the ultraviolet CMD, and no significant central concentration of CV candidates is seen in this cluster.
Hertzsprung-Russell and colour-magnitude diagrams, blue stragglers, globular clusters: individual: M30 NGC 7099, techniques: image processing, techniques: photometric, ultraviolet: stars
3785-3794
Mansfield, Santana
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Dieball, Andrea
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Kroupa, Pavel
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Knigge, Christian
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Zurek, David R.
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Shara, Michael
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Long, Knox S.
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1 April 2022
Mansfield, Santana
c98ddd4d-5643-4db5-899d-063a29f440c2
Dieball, Andrea
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Kroupa, Pavel
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Knigge, Christian
ac320eec-631a-426e-b2db-717c8bf7857e
Zurek, David R.
0de59032-c43c-4c8f-89a2-b451488b86db
Shara, Michael
bac39df6-4548-4335-a751-9be1122e8c33
Long, Knox S.
2195d0ac-518d-4738-8e89-3e8e7a035a6c
Mansfield, Santana, Dieball, Andrea, Kroupa, Pavel, Knigge, Christian, Zurek, David R., Shara, Michael and Long, Knox S.
(2022)
Far-ultraviolet investigation into the galactic globular cluster M30 (NGC 7099): I. Photometry and radial distributions.
Monthly Notices of the Royal Astronomical Society, 511 (3), .
(doi:10.1093/mnras/stac242).
Abstract
We present a far-ultraviolet (FUV) study of the globular cluster M30 (NGC 7099). The images were obtained using the Advanced Camera for Surveys (ACS/SBC, F150LP, FUV) and the Wide Field Planetary Camera 2 (WFPC2, F300W, UV) which were both onboard the Hubble Space Telescope. The FUV - UV colour-magnitude diagram (CMD) shows a main sequence (MS) turnoff at FUV ≈ 22 mag and $FUV-UV\, \approx 3$ mag. The MS extends 4 mag below the turnoff, and a prominent horizontal branch (HB) and blue straggler (BS) sequence can be seen. A total of 1218 MS stars, 185 red giant branch stars, 47 BS stars, and 41 HB stars are identified, along with 78 sources blueward of the MS which consist of white dwarfs (WDs) and objects in the gap between the WDs and the MS that include potential cataclysmic variable (CV) candidates. The radial distribution of the BS population is concentrated towards the cluster centre, indicating that mass segregation has occurred. The blue and red sub-populations of the double BS sequence appear mixed in the ultraviolet CMD, and no significant central concentration of CV candidates is seen in this cluster.
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stac242
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Published date: 1 April 2022
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Keywords:
Hertzsprung-Russell and colour-magnitude diagrams, blue stragglers, globular clusters: individual: M30 NGC 7099, techniques: image processing, techniques: photometric, ultraviolet: stars
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Local EPrints ID: 455166
URI: http://eprints.soton.ac.uk/id/eprint/455166
ISSN: 1365-2966
PURE UUID: 76fe9ffd-e352-49db-8e5e-eb9b8a85fcf2
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Date deposited: 10 Mar 2022 20:18
Last modified: 16 Mar 2024 16:09
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Author:
Santana Mansfield
Author:
Andrea Dieball
Author:
Pavel Kroupa
Author:
David R. Zurek
Author:
Michael Shara
Author:
Knox S. Long
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