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Unveiling the core of M 15 in the far-ultraviolet

Unveiling the core of M 15 in the far-ultraviolet
Unveiling the core of M 15 in the far-ultraviolet
We present an analysis of our deep far- (FUV) and near-ultraviolet (NUV) photometry of the core region of the dense globular cluster M 15. Our FUV-NUV colour-magnitude diagram (CMD) is the deepest one presented for a globular cluster so far, and shows all hot stellar populations expected in a globular cluster, such as horizontal branch stars, blue stragglers, white dwarfs, cataclysmic variables and even main sequence stars. The main sequence turn-off is clearly visible and the main sequence stars form a prominent track that extends at least two magnitudes below the main sequence turn-off. We compare and discuss the radial distribution of the various stellar populations that show up in the FUV. We search for variability amongst our FUV sources and tentatively classify our variable candidates based on an analysis of the UV colours and variability properties. We find that RR Lyraes, Cepheids, and SX Phoenicis exhibit massive variability amplitudes in this waveband (several mags)
globular clusters: individual (M 15), stars: cataclysmic variables, white dwarfs, stars: variables: other, ultraviolet: stars, blue stragglers, binaries: close
361-362
Dieball, A.
5f595453-aa6b-4067-a3e1-026867fb9f7a
Knigge, C.
ac320eec-631a-426e-b2db-717c8bf7857e
Zurek, D.R.
4745ee98-520b-4e26-a05a-113c0c563b97
Shara, M.M.
4d9c7bc7-3420-4773-b421-b1f5c362ab5b
Long, K.S.
91417b3d-d408-475a-8907-eec131e17c66
Charles, P.A.
307182b3-3603-4771-9900-3a096bd9367b
Hannikainen, D.
c17011bd-6099-4dfd-8236-8b57c094a06c
Dieball, A.
5f595453-aa6b-4067-a3e1-026867fb9f7a
Knigge, C.
ac320eec-631a-426e-b2db-717c8bf7857e
Zurek, D.R.
4745ee98-520b-4e26-a05a-113c0c563b97
Shara, M.M.
4d9c7bc7-3420-4773-b421-b1f5c362ab5b
Long, K.S.
91417b3d-d408-475a-8907-eec131e17c66
Charles, P.A.
307182b3-3603-4771-9900-3a096bd9367b
Hannikainen, D.
c17011bd-6099-4dfd-8236-8b57c094a06c

Dieball, A., Knigge, C., Zurek, D.R., Shara, M.M., Long, K.S., Charles, P.A. and Hannikainen, D. (2007) Unveiling the core of M 15 in the far-ultraviolet. Proceedings of the International Astronomical Union, 3 (S246), 361-362. (doi:10.1017/S1743921308015949).

Record type: Article

Abstract

We present an analysis of our deep far- (FUV) and near-ultraviolet (NUV) photometry of the core region of the dense globular cluster M 15. Our FUV-NUV colour-magnitude diagram (CMD) is the deepest one presented for a globular cluster so far, and shows all hot stellar populations expected in a globular cluster, such as horizontal branch stars, blue stragglers, white dwarfs, cataclysmic variables and even main sequence stars. The main sequence turn-off is clearly visible and the main sequence stars form a prominent track that extends at least two magnitudes below the main sequence turn-off. We compare and discuss the radial distribution of the various stellar populations that show up in the FUV. We search for variability amongst our FUV sources and tentatively classify our variable candidates based on an analysis of the UV colours and variability properties. We find that RR Lyraes, Cepheids, and SX Phoenicis exhibit massive variability amplitudes in this waveband (several mags)

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Published date: 2007
Keywords: globular clusters: individual (M 15), stars: cataclysmic variables, white dwarfs, stars: variables: other, ultraviolet: stars, blue stragglers, binaries: close

Identifiers

Local EPrints ID: 144209
URI: http://eprints.soton.ac.uk/id/eprint/144209
PURE UUID: f6f33dfa-82c9-484b-acb4-ecb31916fc67

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Date deposited: 07 Jun 2010 12:59
Last modified: 08 Nov 2021 18:10

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Contributors

Author: A. Dieball
Author: C. Knigge
Author: D.R. Zurek
Author: M.M. Shara
Author: K.S. Long
Author: P.A. Charles
Author: D. Hannikainen

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