Pulse phase spectroscopy of A 0535+26 during its 1994 giant outburst observed with OSSE.
Abstract
We present pulse phase spectroscopy of A 0535+26 in the energy range 35-200keV from OSSE observations of its giant outburst in 1994. We discuss the phase dependence of the continuum parameters and the cyclotron resonance feature (CRF) at 110keV already found in the phase averaged spectrum. We find that a CRF is required at every phase. The behaviour of the line parameters with phase and the pulse shape indicate that the emission occurs in a pencil-beam geometry.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- September 1997
- DOI:
- 10.48550/arXiv.astro-ph/9703135
- arXiv:
- arXiv:astro-ph/9703135
- Bibcode:
- 1997A&A...325..212M
- Keywords:
-
- STARS: MAGNETIC FIELDS;
- STARS: NEUTRON;
- GAMMA-RAYS: OBSERVATIONS;
- Astrophysics
- E-Print:
- accepted for publication in A&