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Stellar exotica in 47 tucanae

Stellar exotica in 47 tucanae
Stellar exotica in 47 tucanae
We present far-ultraviolet (FUV) spectroscopy obtained with HST for 48 blue objects in the core of 47 Tuc. Based on their position in a FUV-optical color-magnitude diagram, these were expected to include cataclysmic variables (CVs), blue stragglers (BSs), white dwarfs (WDs), and other exotic objects. For a subset of these sources, we also construct FUV-NIR spectral energy disributions. Based on our analysis of this extensive data set, we report the following main results. (1) We spectroscopically confirm 3 previously known or suspected CVs via the detection of emission lines and find new evidence for dwarf nova eruptions in two of these. (2) Only one other source in our spectroscopic sample exhibits marginal evidence for line emission, but predicted and observed CV numbers still agree to within a factor of about 2-3. (3) We have discovered a hot (Teff = 8700 K), low-mass (M = 0.05 M) secondary star in a previously known 0.8 day binary system. This exotic object is probably the remnant of a subgiant that has been stripped of its envelope and may represent the "smoking gun" of a recent dynamical encounter. (4) We have found a helium WD, the second to be optically detected in 47 Tuc, and the first outside a millisecond-pulsar system. (5) We have discovered a BS-WD binary system, the first known in any globular cluster. (6) We have found two additional candidate WD binary systems with putative main sequence and subgiant companions. (7) We estimate the WD binary fraction in the core of 47 Tuc to be 15%+ 17%?9% (stat) + 8%?7% (sys). (8) One BS in our sample may exceed twice the cluster turnoff mass, but the uncertainties are large. Taken as a whole, our study illustrates the wide range of stellar exotica that are lurking in the cores of GCs, most of which are likely to have undergone significant dynamical encounters.
0004-637X
1006
Knigge, Christian
ac320eec-631a-426e-b2db-717c8bf7857e
Dieball, Andrea
5f595453-aa6b-4067-a3e1-026867fb9f7a
Apellániz, Jesús Maíz
4643f0ce-75b3-42a0-af9f-50ec42a54e6c
Long, Knox S.
2195d0ac-518d-4738-8e89-3e8e7a035a6c
Zurek, David R.
9874684b-3f56-4f4f-83f7-7a9c3c657f2b
Shara, Michael M.
bac39df6-4548-4335-a751-9be1122e8c33
Knigge, Christian
ac320eec-631a-426e-b2db-717c8bf7857e
Dieball, Andrea
5f595453-aa6b-4067-a3e1-026867fb9f7a
Apellániz, Jesús Maíz
4643f0ce-75b3-42a0-af9f-50ec42a54e6c
Long, Knox S.
2195d0ac-518d-4738-8e89-3e8e7a035a6c
Zurek, David R.
9874684b-3f56-4f4f-83f7-7a9c3c657f2b
Shara, Michael M.
bac39df6-4548-4335-a751-9be1122e8c33

Knigge, Christian, Dieball, Andrea, Apellániz, Jesús Maíz, Long, Knox S., Zurek, David R. and Shara, Michael M. (2008) Stellar exotica in 47 tucanae. Astrophysical Journal, 683 (2), 1006. (doi:10.1086/589987).

Record type: Article

Abstract

We present far-ultraviolet (FUV) spectroscopy obtained with HST for 48 blue objects in the core of 47 Tuc. Based on their position in a FUV-optical color-magnitude diagram, these were expected to include cataclysmic variables (CVs), blue stragglers (BSs), white dwarfs (WDs), and other exotic objects. For a subset of these sources, we also construct FUV-NIR spectral energy disributions. Based on our analysis of this extensive data set, we report the following main results. (1) We spectroscopically confirm 3 previously known or suspected CVs via the detection of emission lines and find new evidence for dwarf nova eruptions in two of these. (2) Only one other source in our spectroscopic sample exhibits marginal evidence for line emission, but predicted and observed CV numbers still agree to within a factor of about 2-3. (3) We have discovered a hot (Teff = 8700 K), low-mass (M = 0.05 M) secondary star in a previously known 0.8 day binary system. This exotic object is probably the remnant of a subgiant that has been stripped of its envelope and may represent the "smoking gun" of a recent dynamical encounter. (4) We have found a helium WD, the second to be optically detected in 47 Tuc, and the first outside a millisecond-pulsar system. (5) We have discovered a BS-WD binary system, the first known in any globular cluster. (6) We have found two additional candidate WD binary systems with putative main sequence and subgiant companions. (7) We estimate the WD binary fraction in the core of 47 Tuc to be 15%+ 17%?9% (stat) + 8%?7% (sys). (8) One BS in our sample may exceed twice the cluster turnoff mass, but the uncertainties are large. Taken as a whole, our study illustrates the wide range of stellar exotica that are lurking in the cores of GCs, most of which are likely to have undergone significant dynamical encounters.

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Published date: 20 August 2008

Identifiers

Local EPrints ID: 144195
URI: http://eprints.soton.ac.uk/id/eprint/144195
ISSN: 0004-637X
PURE UUID: 984ad396-fe73-4bc8-9cb2-844dd81ece77

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Date deposited: 16 Apr 2010 15:15
Last modified: 08 Nov 2021 18:10

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Contributors

Author: Andrea Dieball
Author: Jesús Maíz Apellániz
Author: Knox S. Long
Author: David R. Zurek
Author: Michael M. Shara

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