Issue |
A&A
Volume 482, Number 1, April IV 2008
|
|
---|---|---|
Page(s) | 237 - 245 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361:20078535 | |
Published online | 04 March 2008 |
Faint super-soft X-ray sources in XMM-Newton Large Magellanic Cloud fields
1
Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, 85741 Garching, Germany e-mail: [pkahabka;fwh]@mpe.mpg.de
2
Observatoire de Strasbourg, 11 rue de l'Université, 67000 Strasbourg, France e-mail: pakull@astro.u-strasbg.fr
3
Centre for Astronomy, James Cook University, Townsville, Queensland 4811, Australia
4
University of Western Sydney, Locked Bag 1797, Penrith South DC, NSW 1797, Australia
Received:
23
August
2007
Accepted:
16
December
2007
Aims. We report the discovery of three faint, super-soft X-ray sources in LMC fields observed with XMM-Newton.
Methods. We analyse the three new sources together with RX J0537.7-7034 and RX J0507.1-6743, both known since ROSAT.
Results. We identify XMMU J050803.1-684017 with the LMC planetary nebula LHA 120-N 102 = LMC SMP 29. The
EPIC-pn spectrum of XMMU J050803.1-684017 can be fitted with a blackbody spectrum
with an effective temperature of ~(26–51) eV and a
bolometric luminosity of (0.1-30)1036 erg s-1, depending on the assumed absorption. The source is
consistent with the nucleus of a planetary nebula. The EPIC-pn
spectrum of XMMU J052530.5-671501 is characterized by a blackbody temperature
of ~(38–120) eV, a best-fit bolometric
luminosity of ~3
1037 erg s-1 and
absorbing LMC column of
1021 cm-2. This most likely highly-absorbed super-soft source
resembles the LMC super-soft source CAL 87. The EPIC-pn spectrum of
XMMU J052215.0-701658 yields a blackbody temperature of ~(24–83) eV,
but there are only about 40 source counts
and the spectral parameters of the source are not well constrained.
We observe RX J0537.7-7034 with EPIC-pn to be about a factor of 15 fainter
compared to the ROSAT observation 11 years earlier. RX J0507.1-6743 is
observed as an absorbed super-soft source by XMM-Newton and the
improved X-ray position coincides with a MACHO star which is
consistent with a symbiotic star.
Key words: galaxies: Magellanic Clouds / X-rays: stars / stars: binaries: close / stars / binaries: general / stars: general
© ESO, 2008
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