The Be/neutron star system Swift J004929.5-733107 in the Small Magellanic Cloud–X-ray characteristics and optical counterpart candidates
| العنوان: | The Be/neutron star system Swift J004929.5-733107 in the Small Magellanic Cloud–X-ray characteristics and optical counterpart candidates |
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| المؤلفون: | M. J. Coe, D. A. H. Buckley, I. M. Monageng, Phil Evans, Andrzej Udalski, J. A. Kennea, L. J. Townsend |
| المصدر: | Monthly Notices of the Royal Astronomical Society. 504:1398-1406 |
| بيانات النشر: | Oxford University Press (OUP), 2021. |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | High Energy Astrophysical Phenomena (astro-ph.HE), Physics, 010308 nuclear & particles physics, Be star, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Balmer series, Binary number, Astronomy and Astrophysics, Astrophysics, Star (graph theory), Stellar classification, 01 natural sciences, Luminosity, symbols.namesake, Neutron star, Space and Planetary Science, 0103 physical sciences, symbols, Astrophysics::Solar and Stellar Astrophysics, Small Magellanic Cloud, Astrophysics - High Energy Astrophysical Phenomena, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics |
| الوصف: | Swift J004929.5-733107 is an X-ray source in the Small Magellanic Cloud (SMC) that has been reported several times, but the optical counterpart has been unclear due to source confusion in a crowded region of the SMC. Previous works proposed [MA93] 302 as the counterpart, however we show here, using data obtained from the S-CUBED project, that the X-ray positio is inconsistent with that object. Instead we propose a previously unclassified object which has all the indications of being a newly identified Be star exhibiting strong HU emission. Evidence for the presence of significant I-band variability strongly suggest that this is, in fact, a Be type star with a large circumstellar disk. Over 18 years worth of optical monitoring by the OGLE project reveal a periodic modulation at a period of 413d, probably the binary period of the system. A SALT optical spectrum shows strong Balmer emission and supports a proposed spectral classification of B1-3 III-IVe. The X-ray data obtained from the S-CUBED project reveal a time-averaged spectrum well fitted by a photon index = 0.93 pm 0.16. Assuming the known distance to the SMC the flux corresponds to a luminosity 10E35 erg/s. All of these observational facts suggest that this is confirmed as a Be star-neutron star X-ray binary (BeXRB) in the SMC, albeit one with an unusually long binary period at the limits of the Corbet Diagram. 9 pages 12 figures |
| تدمد: | 1365-2966 0035-8711 |
| DOI: | 10.1093/mnras/stab972 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3c36bdf26c99e7a0badaa3395565dd50 https://doi.org/10.1093/mnras/stab972 |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....3c36bdf26c99e7a0badaa3395565dd50 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 13652966 00358711 |
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| DOI: | 10.1093/mnras/stab972 |