SXP 7.92: a recently rediscovered be/x-ray binary in the small magellanic cloud, viewed edge on

Simple item page
dc.contributor.authorBartlett, E S
dc.contributor.authorCoe, M J
dc.contributor.authorIsrael, G L
dc.contributor.authorClark, J S
dc.contributor.authorEsposito, P
dc.contributor.authorD’Elia, V
dc.contributor.authorUdalski, A
dc.date.accessioned2021-10-08T07:08:25Z
dc.date.available2021-10-08T07:08:25Z
dc.date.issued2017
dc.description.abstractWe present a detailed optical and X-ray study of the 2013 outburst of the Small Magellanic Cloud Be/X-ray binary SXP 7.92, as well as an overview of the last 18 years of observations from OGLE (Optical Gravitational Lensing Experiment), RXTE, Chandra and XMM-Newton. We revise the position of this source to RA(J2000) = 00:57:58.4, Dec(J2000) = −72:22:29.5 with a 1σ uncertainty of 1.5 arcsec, correcting the previously reported position by Coe et al. by more than 20 arcmin. We identify and spectrally classify the correct counterpart as a B1Ve star. The optical spectrum is distinguished by an uncharacteristically deep narrow Balmer series, with the Hα line in particular having a distinctive shell profile, i.e. a deep absorption core embedded in an emission line. We interpret this as evidence that we are viewing the system edge on and are seeing self-obscuration of the circumstellar disc. We derive an optical period for the system of 40.0 ± 0.3 d, which we interpret as the orbital period, and present several mechanisms to describe the X-ray/optical behaviour in the recent outburst, in particular the ‘flares'and ‘dips’ seen in the optical light curve, including a transient accretion disc and an elongated precessing disc.
dc.identifier.apacitationBartlett, E. S., Coe, M. J., Israel, G. L., Clark, J. S., Esposito, P., , & Udalski, A. (2017). SXP 7.92: a recently rediscovered be/x-ray binary in the small magellanic cloud, viewed edge on. <i>Monthly Notices of the Royal Astronomical Society</i>, 49(4), stx032 - 177. http://hdl.handle.net/11427/34577en_ZA
dc.identifier.chicagocitationBartlett, E S, M J Coe, G L Israel, J S Clark, P Esposito, , and A Udalski "SXP 7.92: a recently rediscovered be/x-ray binary in the small magellanic cloud, viewed edge on." <i>Monthly Notices of the Royal Astronomical Society</i> 49, 4. (2017): stx032 - 177. http://hdl.handle.net/11427/34577en_ZA
dc.identifier.citationBartlett, E.S., Coe, M.J., Israel, G.L., Clark, J.S., Esposito, P., & Udalski, A. 2017. SXP 7.92: a recently rediscovered be/x-ray binary in the small magellanic cloud, viewed edge on. <i>Monthly Notices of the Royal Astronomical Society.</i> 49(4):stx032 - 177. http://hdl.handle.net/11427/34577en_ZA
dc.identifier.issn0035-8711
dc.identifier.issn1365-2966
dc.identifier.ris TY - Journal Article AU - Bartlett, E S AU - Coe, M J AU - Israel, G L AU - Clark, J S AU - Esposito, P AU - D’Elia, V AU - Udalski, A AB - We present a detailed optical and X-ray study of the 2013 outburst of the Small Magellanic Cloud Be/X-ray binary SXP 7.92, as well as an overview of the last 18 years of observations from OGLE (Optical Gravitational Lensing Experiment), RXTE, Chandra and XMM-Newton. We revise the position of this source to RA(J2000) = 00:57:58.4, Dec(J2000) = −72:22:29.5 with a 1σ uncertainty of 1.5 arcsec, correcting the previously reported position by Coe et al. by more than 20 arcmin. We identify and spectrally classify the correct counterpart as a B1Ve star. The optical spectrum is distinguished by an uncharacteristically deep narrow Balmer series, with the Hα line in particular having a distinctive shell profile, i.e. a deep absorption core embedded in an emission line. We interpret this as evidence that we are viewing the system edge on and are seeing self-obscuration of the circumstellar disc. We derive an optical period for the system of 40.0 ± 0.3 d, which we interpret as the orbital period, and present several mechanisms to describe the X-ray/optical behaviour in the recent outburst, in particular the ‘flares'and ‘dips’ seen in the optical light curve, including a transient accretion disc and an elongated precessing disc. DA - 2017 DB - OpenUCT DP - University of Cape Town IS - 4 J1 - Monthly Notices of the Royal Astronomical Society LK - https://open.uct.ac.za PY - 2017 SM - 0035-8711 SM - 1365-2966 T1 - SXP 7.92: a recently rediscovered be/x-ray binary in the small magellanic cloud, viewed edge on TI - SXP 7.92: a recently rediscovered be/x-ray binary in the small magellanic cloud, viewed edge on UR - http://hdl.handle.net/11427/34577 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/34577
dc.identifier.vancouvercitationBartlett ES, Coe MJ, Israel GL, Clark JS, Esposito P, , et al. SXP 7.92: a recently rediscovered be/x-ray binary in the small magellanic cloud, viewed edge on. Monthly Notices of the Royal Astronomical Society. 2017;49(4):stx032 - 177. http://hdl.handle.net/11427/34577.en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Astronomy
dc.publisher.facultyFaculty of Science
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.source.journalissue4
dc.source.journalvolume49
dc.source.paginationstx032 - 177
dc.source.urihttps://dx.doi.org/10.1093/mnras/stx032
dc.subject.otherstars: emission-line, Be
dc.subject.otherMagellanic Clouds
dc.subject.otherX-rays: binaries
dc.titleSXP 7.92: a recently rediscovered be/x-ray binary in the small magellanic cloud, viewed edge on
dc.typeJournal Article
uct.type.publicationResearch
uct.type.resourceJournal Article
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
BartlettES_SXP_nbsp_7_92_a_2017.pdf
Size:
3.32 MB
Format:
Adobe Portable Document Format
Description:
Download
Collections
Journal Articles