Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002pasj...54..241n&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.54, No.2, pp.241-251
Astronomy and Astrophysics
Astronomy
1
Stars: Atmospheres, Stars: Magnetic Fields, Stars: Neutron
Scientific paper
The cyclotron lines are affected by photon splitting in super-strong magnetized atmospheres (~ 4.4 × 1013 G into which a power-law-type flux is injected. We studied the polarization effect of photon splitting on the cyclotron line formation by treating different modes of splitting. We calculated the emergent spectra for two conditions: only one splitting mode and three splitting modes that could operate in a neutron-star atmosphere with a subcritical magnetic field. Photon splitting can also operate over a larger scale than cyclotron resonant scattering in a neutron-star atmosphere, since photon splitting occurs in a super-strong magnetic field even in the absence of a plasma. We therefore considered atmospheres consisting of lower and higher density regions. Cyclotron resonant scattering is dominant in a higher density region, and photon splitting is dominant in a lower density region. In three splitting modes, we found that the cyclotron absorption l ines are strongly reprocessed by photon splitting, and thus may not be detected even for a magnetic field of about 1.0 × 1013 G in the power-law-type spectra. However, we confirmed that the cyclotron absorption lines are not mostly reprocessed by photon splitting in only one splitting mode.
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