Issue |
A&A
Volume 518, July-August 2010
Herschel: the first science highlights
|
|
---|---|---|
Article Number | A24 | |
Number of page(s) | 12 | |
Section | Stellar atmospheres | |
DOI | https://doi.org/10.1051/0004-6361/201014781 | |
Published online | 25 August 2010 |
Cyclotron harmonics in opacities of isolated neutron star atmospheres
1
CRAL (UMR CNRS No. 5574),
École Normale Supérieure de Lyon,
69364 Lyon Cedex 07, France e-mail: palex@astro.ioffe.ru
2
Ioffe Physical-Technical Institute,
Politekhnicheskaya 26, 194021 St. Petersburg, Russia
3
Isaac Newton Institute of Chile,
St. Petersburg Branch, Russia
Received:
13
April
2010
Accepted:
5
May
2010
Some X-ray dim isolated neutron stars (XDINS) and central
compact objects in supernova remnants (CCO) contain absorption features in
their thermal soft X-ray spectra. It has been hypothesized
that this absorption may relate to periodic peaks in
free-free absorption opacities, caused by either Landau quantization
of electron motion in magnetic fields B 1011 G or analogous
quantization of ion motion in magnetic fields B > 1013 G.
Here, I review
the physics behind cyclotron quantum harmonics in free-free
photoabsorption, discuss different approximations for their calculation,
and explain why the ion cyclotron harmonics (beyond the fundamental)
cannot be observed.
Key words: stars: neutron / stars: atmospheres / opacity / magnetic fields / X-rays: stars
© ESO, 2010
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