<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Haberl, F.</style></author><author><style face="normal" font="default" size="100%">Israel, G. L.</style></author><author><style face="normal" font="default" size="100%">Rodriguez Castillo, G. A.</style></author><author><style face="normal" font="default" size="100%">Vasilopoulos, G.</style></author><author><style face="normal" font="default" size="100%">Delvaux, C.</style></author><author><style face="normal" font="default" size="100%">de Luca, A</style></author><author><style face="normal" font="default" size="100%">Carpano, S.</style></author><author><style face="normal" font="default" size="100%">Esposito, P.</style></author><author><style face="normal" font="default" size="100%">Novara, G.</style></author><author><style face="normal" font="default" size="100%">Salvaterra, R.</style></author><author><style face="normal" font="default" size="100%">Tiengo, A.</style></author><author><style face="normal" font="default" size="100%">D'Agostino, D.</style></author><author><style face="normal" font="default" size="100%">Udalski, A.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">EXTraS discovery of two pulsators in the direction of the LMC: a Be/X-ray binary pulsar in the LMC and a candidate double-degenerate polar in the foreground</style></title><short-title><style face="normal" font="default" size="100%">Astronomy and Astrophysics</style></short-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Astrophysics - High Energy Astrophysical Phenomena</style></keyword><keyword><style  face="normal" font="default" size="100%">Be</style></keyword><keyword><style  face="normal" font="default" size="100%">binaries: close</style></keyword><keyword><style  face="normal" font="default" size="100%">CATACLYSMIC VARIABLES</style></keyword><keyword><style  face="normal" font="default" size="100%">galaxies: star clusters: individual: Large Magellanic Cloud</style></keyword><keyword><style  face="normal" font="default" size="100%">galaxies: stellar content</style></keyword><keyword><style  face="normal" font="default" size="100%">Novae</style></keyword><keyword><style  face="normal" font="default" size="100%">stars: emission-line</style></keyword><keyword><style  face="normal" font="default" size="100%">stars: neutron</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2017</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2017/02/1</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">https://ui.adsabs.harvard.edu/abs/2017A&amp;A...598A..69H</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">598</style></volume><pages><style face="normal" font="default" size="100%">A69</style></pages><isbn><style face="normal" font="default" size="100%">0004-6361</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Context. The Exploring the X-ray Transient and variable Sky (EXTraS) project searches for coherent signals in the X-ray archival data of XMM-Newton. &lt;BR /&gt; Aims: XMM-Newton performed more than 400 pointed observations in the region of the Large Magellanic Cloud (LMC). We inspected the results of the EXTraS period search to systematically look for new X-ray pulsators in our neighbour galaxy. &lt;BR /&gt; Methods: We analysed the XMM-Newton observations of two sources from the 3XMM catalogue which show significant signals for coherent pulsations. &lt;BR /&gt; Results: 3XMM J051259.8-682640 was detected as a source with a hard X-ray spectrum in two XMM-Newton observations, revealing a periodic modulation of the X-ray flux with 956 s. As optical counterpart we identify an early-type star with Hα emission. The OGLE I-band light curve exhibits a regular pattern with three brightness dips which mark a period of 1350 d. The X-ray spectrum of 3XMM J051034.6-670353 is dominated by a super-soft blackbody-like emission component (kT 70 eV) which is modulated by nearly 100% with a period of 1418 s. From GROND observations we suggest a star with r' = 20.9 mag as a possible counterpart of the X-ray source. &lt;BR /&gt; Conclusions: 3XMM J051259.8-682640 is confirmed as a new Be/X-ray binary pulsar in the LMC. We discuss the long-term optical period as the likely orbital period which would be the longest known from a high-mass X-ray binary. The spectral and temporal properties of the super-soft source 3XMM J051034.6-670353 are very similar to those of RX J0806.3+1527 and RX J1914.4+2456 suggesting that it belongs to the class of double-degenerate polars and is located in our Galaxy rather than in the LMC.</style></abstract></record></records></xml>