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High-mass X-ray binary SXP18.3 undergoes the longest type II outburst ever seen in the small magellanic cloud

High-mass X-ray binary SXP18.3 undergoes the longest type II outburst ever seen in the small magellanic cloud
High-mass X-ray binary SXP18.3 undergoes the longest type II outburst ever seen in the small magellanic cloud
On 2006 August 30, SXP18.3 a high-mass X-ray binary (HMXB) in the Small Magellanic Cloud (SMC) with an 18.3 s pulse period was observed by Rossi X-ray Timing Explorer (RXTE). The source was seen continuously for the following 36 weeks. This is the longest type II outburst ever seen from a HMXB in the SMC. During the outburst, SXP18.3 was located from serendipitous XMM–Newton observations. The identification of the optical counterpart has allowed SXP18.3 to be classified as a Be/X-ray binary. This paper will report on the analysis of the optical and weekly RXTE X-ray data that span the last 10 yr. The extreme length of this outburst has for the first time enabled us to perform an extensive study of the pulse timing of a SMC Be/X-ray binary. We present a possible full orbital solution from the pulse timing data. An orbital period of 17.79 d is proposed from the analysis of the Optical Gravitational Lensing Experiment (OGLE) III light curve placing SXP18.3 on the boundary of known sources in the Corbet diagram.

stars: emission-line, be, magellanic clouds, x-rays: binaries
0035-8711
361-366
Schurch, M.P.E.
1a6b3c0a-67d7-44e9-9d0c-94041f939d6b
Coe, Malcolm J.
04dfb23b-1456-46a3-9242-5cee983471d5
Galache, J.L.
f4b15a28-e3a7-49bb-9000-4e75df9d93ad
Corbet, R.H.D.
7d365a78-a577-4f56-8d3a-503b7fccb42b
McGowan, K.E.
1d9a32e0-414b-462b-ab42-9901e4aeb2f3
McBride, V.A.
36106df1-eae1-4eff-974e-2aba84523b85
Townsend, Lee J.
383d1487-54d3-4912-82d3-1cc3b4b28d5e
Udalski, A.
a7d3b194-1531-47cd-a634-abe3b8b067b0
Haberl, Frank
e279c877-e917-4a24-bcc9-cf7de12b33fb
Schurch, M.P.E.
1a6b3c0a-67d7-44e9-9d0c-94041f939d6b
Coe, Malcolm J.
04dfb23b-1456-46a3-9242-5cee983471d5
Galache, J.L.
f4b15a28-e3a7-49bb-9000-4e75df9d93ad
Corbet, R.H.D.
7d365a78-a577-4f56-8d3a-503b7fccb42b
McGowan, K.E.
1d9a32e0-414b-462b-ab42-9901e4aeb2f3
McBride, V.A.
36106df1-eae1-4eff-974e-2aba84523b85
Townsend, Lee J.
383d1487-54d3-4912-82d3-1cc3b4b28d5e
Udalski, A.
a7d3b194-1531-47cd-a634-abe3b8b067b0
Haberl, Frank
e279c877-e917-4a24-bcc9-cf7de12b33fb

Schurch, M.P.E., Coe, Malcolm J., Galache, J.L., Corbet, R.H.D., McGowan, K.E., McBride, V.A., Townsend, Lee J., Udalski, A. and Haberl, Frank (2008) High-mass X-ray binary SXP18.3 undergoes the longest type II outburst ever seen in the small magellanic cloud. Monthly Notices of the Royal Astronomical Society, 392 (1), 361-366. (doi:10.1111/j.1365-2966.2008.14048.x).

Record type: Article

Abstract

On 2006 August 30, SXP18.3 a high-mass X-ray binary (HMXB) in the Small Magellanic Cloud (SMC) with an 18.3 s pulse period was observed by Rossi X-ray Timing Explorer (RXTE). The source was seen continuously for the following 36 weeks. This is the longest type II outburst ever seen from a HMXB in the SMC. During the outburst, SXP18.3 was located from serendipitous XMM–Newton observations. The identification of the optical counterpart has allowed SXP18.3 to be classified as a Be/X-ray binary. This paper will report on the analysis of the optical and weekly RXTE X-ray data that span the last 10 yr. The extreme length of this outburst has for the first time enabled us to perform an extensive study of the pulse timing of a SMC Be/X-ray binary. We present a possible full orbital solution from the pulse timing data. An orbital period of 17.79 d is proposed from the analysis of the Optical Gravitational Lensing Experiment (OGLE) III light curve placing SXP18.3 on the boundary of known sources in the Corbet diagram.

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More information

Published date: 25 November 2008
Keywords: stars: emission-line, be, magellanic clouds, x-rays: binaries
Organisations: University of Southampton

Identifiers

Local EPrints ID: 143565
URI: http://eprints.soton.ac.uk/id/eprint/143565
ISSN: 0035-8711
PURE UUID: 547a5f19-b17b-4098-9e10-47e04b244d8e
ORCID for Malcolm J. Coe: ORCID iD orcid.org/0000-0002-0763-8547

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Date deposited: 12 Apr 2010 12:19
Last modified: 18 Feb 2021 16:34

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Contributors

Author: M.P.E. Schurch
Author: Malcolm J. Coe ORCID iD
Author: J.L. Galache
Author: R.H.D. Corbet
Author: K.E. McGowan
Author: V.A. McBride
Author: Lee J. Townsend
Author: A. Udalski
Author: Frank Haberl

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