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EXTraS discovery of two pulsators in the direction of the LMC
- Source :
- arXiv.org e-Print Archive, NASA Astrophysics Data System, Astronomy & astrophysics (Online) 598 Article Number A69 (2017). doi:10.1051/0004-6361/201629744, info:cnr-pdr/source/autori:F. Haberl, G. L. Israel, G. A. Rodriguez Castillo, G. Vasilopoulos, C. Delvaux, A. De Luca, S. Carpano, P. Esposito, G. Novara, R. Salvaterra, A. Tiengo, D. D'Agostino, and A. Udalski/titolo:EXTraS discovery of two pulsators in the direction of the LMC: a Be%2FX-ray binary pulsar in the LMC and a candidate double-degenerate polar in the foreground/doi:10.1051%2F0004-6361%2F201629744/rivista:Astronomy & astrophysics (Online)/anno:2017/pagina_da:/pagina_a:/intervallo_pagine:/volume:598 Article Number A69, Astronomy & Astrophysics, 598:A69. EDP Sciences
- Publication Year :
- 2017
-
Abstract
- The EXTraS project to explore the X-ray Transient and variable Sky searches for coherent signals in the X-ray archival data of XMM-Newton. 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. We analysed the XMM-Newton observations of two sources from the 3XMM catalogue which show significant signals for coherent pulsations. 3XMM J051259.8-682640 was detected as source with 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 Halpha 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 possible counterpart of the X-ray source. 3XMM J051259.8-682640 is confirmed as a new Be/X-ray binary pulsar in the Large Magellanic Cloud. We discuss the long-term optical period as 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.<br />Comment: 10 pages, 13 figures, accepted for publication in Astronomy & Astrophysics, new version with minor corrections
- Subjects :
- Brightness
stars: cataclysmic variables
Astrophysics::High Energy Astrophysical Phenomena
X-ray binary
stars: emission-line
FOS: Physical sciences
Astrophysics
Binaries: close
Galaxies: star clusters: individual: Large Magellanic Cloud
Galaxies: stellar content
Novae cataclysmic variables
Stars: emission-line Be
Stars: neutron
Astrophysics::Cosmology and Extragalactic Astrophysics
01 natural sciences
Binary pulsar
stars: neutron
X-rays: binaries
Pulsar
0103 physical sciences
Large Magellanic Cloud
010303 astronomy & astrophysics
Astrophysics::Galaxy Astrophysics
Physics
High Energy Astrophysical Phenomena (astro-ph.HE)
010308 nuclear & particles physics
Astronomy and Astrophysics
Light curve
Orbital period
Galaxy
galaxies: individual: Large Magellanic Cloud
stars: binaries: close
Space and Planetary Science
galaxies: stellar content
Astrophysics - High Energy Astrophysical Phenomena
Subjects
Details
- Language :
- English
- ISSN :
- 00046361
- Volume :
- 598
- Database :
- OpenAIRE
- Journal :
- Astronomy & Astrophysics
- Accession number :
- edsair.doi.dedup.....a443561aa2eff4b83a906166b3ee4758