2011A&A...527A.131S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST00:55:15

2011A&A...527A.131S - Astronomy and Astrophysics, volume 527A, 131-131 (2011/3-1)

The XMM-Newton survey of the Small Magellanic Cloud: discovery of the 11.866 s Be/X-ray binary pulsar XMMU J004814.0-732204 (SXP11.87).

STURM R., HABERL F., COE M.J., BARTLETT E.S., BUCKLEY D.A.H., CORBET R.H.D., EHLE M., FILIPOVIC M.D., HATZIDIMITRIOU D., MEREGHETTI S., LA PALOMBARA N., PIETSCH W., TIENGO A., TOWNSEND L.J. and UDALSKI A.

Abstract (from CDS):

One of the goals of the XMM-Newton survey of the Small Magellanic Cloud is to study the Be/X-ray binary population. During one of our first survey observations, a bright new transient - XMMUJ004814.0-732204 - was discovered. We present the analysis of the EPIC X-ray data, together with optical observations, to investigate the spectral and temporal characteristics of XMMUJ004814.0-732204 . We found coherent X-ray pulsations in the EPIC data with a period of (11.86642±0.00017)s. The X-ray spectrum can be modelled by an absorbed power law with an indication for a soft excess. Depending on the modelling of the soft X-ray spectrum, the photon index ranges between 0.53 and 0.66. We identify the optical counterpart as a B=14.9mag star that was monitored during the MACHO and OGLE-III projects. The optical light curves show regular outbursts by ∼0.5 mag in B and R and up to 0.9 mag in I, which repeat on a time scale of about 1000 days. The OGLE-III optical colours of the star are consistent with an early B spectral type. An optical spectrum obtained at the 1.9m telescope of the South African Astronomical Observatory in December 2009 shows Hαemission with an equivalent width of 3.5±0.6Å. The X-ray spectrum and the detection of pulsations suggest that XMMUJ004814.0-732204 is a new high-mass X-ray binary pulsar in the SMC. The long term variability and the Hαemission line in the spectrum of the optical counterpart identify it as a Be/X-ray binary system.

Abstract Copyright:

Journal keyword(s): galaxies: individual: Small Magellanic Cloud - galaxies: stellar content - stars: emission-line, Be - stars: neutron - X-rays: binaries

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 MACHO 212.15846.83 RB? 00 48 13.421 -73 22 03.10   18.90 17.26   15.88 ~ 2 0
2 SXP 11.87 HXB 00 48 13.47 -73 22 03.1   14.54 14.66     ~ 13 0
3 MACHO 212.15846.70 Lev 00 48 13.78 -73 22 00.5 15.20 15.93 15.90   16.00 ~ 1 0
4 OGLE J004814.06-732203.5 Be? 00 48 14.06 -73 22 03.5 13.96 14.90 15.02   15.25 ~ 4 0
5 SXP 18.3 HXB 00 49 11.4584818147 -72 49 37.500630189 15.16 15.80 15.61 15.42 15.525 ~ 38 0
6 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9440 1
7 SXP 6.85 HXB 01 02 53.3181214914 -72 44 35.166325803   14.51 14.59     O9.5-B0IV-V 55 0
8 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5665 1

    Equat.    Gal    SGal    Ecl

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2020.07.04-00:55:15

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