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CXOGBS J173620.2-293338: A candidate symbiotic X-ray binary associated with a bulge carbon star

CXOGBS J173620.2-293338: A candidate symbiotic X-ray binary associated with a bulge carbon star
CXOGBS J173620.2-293338: A candidate symbiotic X-ray binary associated with a bulge carbon star
The Galactic Bulge Survey (GBS) is a wide but shallow X-ray survey of regions above and below the Plane in the Galactic Bulge. It was performed using the Chandra X-ray Observatory's ACIS camera. The survey is primarily designed to find and classify low luminosity X-ray binaries. The combination of the X-ray depth of the survey and the accessibility of optical and infrared counterparts makes this survey ideally suited to identification of new symbiotic X-ray binaries (SyXBs) in the Bulge. We consider the specific case of the X-ray source CXOGBS J173620.2-293338. It is coincident to within 1 arcsec with a very red star, showing a carbon star spectrum and irregular variability in the Optical Gravitational Lensing Experiment data. We classify the star as a late C-R type carbon star based on its spectral features, photometric properties, and variability characteristics, although a low-luminosity C-N type cannot be ruled out. The brightness of the star implies it is located in the Bulge, and its photometric properties are overall consistent with the Bulge carbon star population. Given the rarity of carbon stars in the Bulge, we estimate the probability of such a close chance alignment of any GBS source with a carbon star to be
binaries: symbiotic, stars: AGB and post-AGB, stars: carbon, surveys, X-rays: binaries
0004-637X
11
Hynes, Robert I.
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Torres, M.A.P.
e7b42f8b-33a2-47bb-94b5-cad7d50a1177
Heinke, C.O.
50442ec4-8a45-4aa5-b425-28d0c896dc08
Maccarone, T.J.
c2f1d87b-e2ef-4e33-b09f-a2861d917ea8
Mikles, V.J.
68d997ae-4652-4ab6-8476-7e195164ba9c
Britt, C.T.
91612ea1-45fc-4047-a119-8d89662a4b3b
Knigge, C.
ac320eec-631a-426e-b2db-717c8bf7857e
Greiss, S.
5959cc28-5b1d-4e97-b3f1-7f057fcf415c
Jonker, P.G.
1c657281-c0dd-4db9-9fd1-899a6c8a34bd
Steeghs, D.
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Nelemans, G.
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Bandyopadhyay, R.M.
6a9d3fc5-7a0b-4557-ac27-5de72da14873
Johnson, C.B.
86eb021b-d49a-451d-b0fc-353ba7e91318
Hynes, Robert I.
f6158bd7-6589-436a-86e0-c43a779cdd0b
Torres, M.A.P.
e7b42f8b-33a2-47bb-94b5-cad7d50a1177
Heinke, C.O.
50442ec4-8a45-4aa5-b425-28d0c896dc08
Maccarone, T.J.
c2f1d87b-e2ef-4e33-b09f-a2861d917ea8
Mikles, V.J.
68d997ae-4652-4ab6-8476-7e195164ba9c
Britt, C.T.
91612ea1-45fc-4047-a119-8d89662a4b3b
Knigge, C.
ac320eec-631a-426e-b2db-717c8bf7857e
Greiss, S.
5959cc28-5b1d-4e97-b3f1-7f057fcf415c
Jonker, P.G.
1c657281-c0dd-4db9-9fd1-899a6c8a34bd
Steeghs, D.
ab1118c0-944a-427a-bfbf-6b82e1320280
Nelemans, G.
d8405945-6a36-4e77-9253-167c3dc52e6e
Bandyopadhyay, R.M.
6a9d3fc5-7a0b-4557-ac27-5de72da14873
Johnson, C.B.
86eb021b-d49a-451d-b0fc-353ba7e91318

Hynes, Robert I., Torres, M.A.P., Heinke, C.O., Maccarone, T.J., Mikles, V.J., Britt, C.T., Knigge, C., Greiss, S., Jonker, P.G., Steeghs, D., Nelemans, G., Bandyopadhyay, R.M. and Johnson, C.B. (2014) CXOGBS J173620.2-293338: A candidate symbiotic X-ray binary associated with a bulge carbon star. The Astrophysical Journal, 780 (1), 11. (doi:10.1088/0004-637X/780/1/11).

Record type: Article

Abstract

The Galactic Bulge Survey (GBS) is a wide but shallow X-ray survey of regions above and below the Plane in the Galactic Bulge. It was performed using the Chandra X-ray Observatory's ACIS camera. The survey is primarily designed to find and classify low luminosity X-ray binaries. The combination of the X-ray depth of the survey and the accessibility of optical and infrared counterparts makes this survey ideally suited to identification of new symbiotic X-ray binaries (SyXBs) in the Bulge. We consider the specific case of the X-ray source CXOGBS J173620.2-293338. It is coincident to within 1 arcsec with a very red star, showing a carbon star spectrum and irregular variability in the Optical Gravitational Lensing Experiment data. We classify the star as a late C-R type carbon star based on its spectral features, photometric properties, and variability characteristics, although a low-luminosity C-N type cannot be ruled out. The brightness of the star implies it is located in the Bulge, and its photometric properties are overall consistent with the Bulge carbon star population. Given the rarity of carbon stars in the Bulge, we estimate the probability of such a close chance alignment of any GBS source with a carbon star to be

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More information

Published date: 1 January 2014
Keywords: binaries: symbiotic, stars: AGB and post-AGB, stars: carbon, surveys, X-rays: binaries

Identifiers

Local EPrints ID: 430093
URI: http://eprints.soton.ac.uk/id/eprint/430093
ISSN: 0004-637X
PURE UUID: feb58748-cfa3-4360-9f02-6bb6fd613873

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Date deposited: 11 Apr 2019 16:30
Last modified: 11 Apr 2019 16:30

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Contributors

Author: Robert I. Hynes
Author: M.A.P. Torres
Author: C.O. Heinke
Author: T.J. Maccarone
Author: V.J. Mikles
Author: C.T. Britt
Author: C. Knigge
Author: S. Greiss
Author: P.G. Jonker
Author: D. Steeghs
Author: G. Nelemans
Author: R.M. Bandyopadhyay
Author: C.B. Johnson

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