@article {41753, title = {Swift J053041.9-665426, a new Be/X-ray binary pulsar in the Large Magellanic Cloud}, volume = {558}, year = {2013}, month = {2013/10/1}, pages = {A74}, abstract = {
Aims: We observed the newly discovered X-ray source Swift J053041.9-665426in the X-ray and optical regime to confirm its proposed nature as a high mass X-ray binary.
Methods: We obtained XMM-Newton and Swift X-ray data, along with optical observations with the ESO Faint Object Spectrograph, to investigate the spectral and temporal characteristics of Swift J053041.9-665426.
Results: The XMM-Newton data show coherent X-ray pulsations with a period of 28.77521(10) s (1σ). The X-ray spectrum can be modelled by an absorbed power law with photon index within the range 0.76 to 0.87. The addition of a black body component increases the quality of the fit but also leads to strong dependences of the photon index, black-body temperature and absorption column density. We identified the only optical counterpart within the error circle of XMM-Newton at an angular distance of ~0.8{\textquoteright}{\textquoteright}, which is 2MASS J05304215-6654303. We performed optical spectroscopy from which we classify the companion as a B0-1.5Ve star.
Conclusions: The X-ray pulsations and long-term variability, as well as the properties of the optical counterpart, confirm that Swift J053041.9-665426 is a new Be/X-ray binary pulsar in the Large Magellanic Cloud.

Based on observations with XMM-Newton, an ESA Science Mission with instruments and contributions directly funded by ESA Member states and the USA (NASA).}, keywords = {Astrophysics - High Energy Astrophysical Phenomena, Be, galaxies: individual: Large Magellanic Cloud, pulsars: individual: Swift J053041.9-665426, stars: emission-line, stars: neutron, X-rays: binaries}, isbn = {0004-6361}, url = {https://ui.adsabs.harvard.edu/abs/2013A\&A...558A..74V}, author = {Vasilopoulos, G. and Maggi, P. and Haberl, F. and Sturm, R. and Pietsch, W. and Bartlett, E. S. and Coe, M. J.} }