Hard X ray observations of VELA X-1 and A0535+26 with HEXE: Discovery of cyclotron lines

Details Hard X ray observations of VELA X-1 and A0535+26 with HEXE: Discovery of cyclotron lines Hard X ray observations of VELA X-1 and A0535+26 with HEXE: Discovery of cyclotron lines

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992nascp3137..217k&link_type=abstract

In NASA. Goddard Space Flight Center, The Compton Observatory Science Workshop p 217 (SEE N92-21874 12-90)

Astronomy and Astrophysics

Astronomy

6

Absorption Spectra, Cyclotron Resonance, Magnetic Fields, Pulsars, X Ray Spectra, X Ray Stars, Cyclotrons, Line Spectra, Mir Space Station, Pulse Duration, Stellar Spectra, X Ray Astronomy

Scientific paper

The X ray pulsars Vela X-1 (4U 0900-40) and A0535+26) were observed with the High Energy X ray Experiment (HEXE) onboard the Mir space station at energies above 20 keV. The pulse profiles of Vela X-1 (P = 283.22 s for JD 244 7486) and A0535+26 (P = 103.27 s for JD 244 7626) were measured up to at least 100 keV. The time averaged pulse profiles of the two sources both show a clear double peak structure with an asymmetric main pulse and a more symmetric secondary pulse. The spectrum of the main pulse is significantly harder than that of the secondary. Pulse phase resolved spectra show absorption features at 54 keV and possibly 27 keV for Vela X-1 and around 100 keV for A0535+26. If these features are interpreted as second and first harmonic (fundamental) cyclotron absorption lines, lower limits are derived of 2.6 x 1012 and 4.3 x 1012 Gauss for the magnetic fields of the neutron stars in Vela X-1 and A0535+26, respectively.

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