Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...199.9503s&link_type=abstract
American Astronomical Society, 199th AAS Meeting, #95.03; Bulletin of the American Astronomical Society, Vol. 33, p.1446
Astronomy and Astrophysics
Astronomy
Scientific paper
SAX J2103.5+4545 is a transient pulsar with a 358 s pulse period discovered with BeppoSAX in a 1997 outburst, and a 12.68 dy orbital period found with the Rossi X-Ray Timing Explorer in a 1999 outburst. In the latter outburst the source exhibited the spin behavior predicted for a transient accreting pulsar accreting through a disk. Over the course of a year, it spun up as the flux increased, came to equilibrium and finally spun down when the flux dropped. The rate of change of the frequency exhibited a one-to-one correlation with the flux. It could be fit to the model due to Ghosh & Lamb of angular momentum accretion onto a neutron star for a distance of 3.2 kpc and a magnetic field of 1.2 x 1013 Gauss. The pulses kept the same shape and amplitude as the flux declined, as if the accretion continued to be through a disk, with the X-rays produced at the neutron star rather than the magnetosphere. The source had not entered a propeller phase. This is the first time a transient pulsar has been tracked into the spin-down state. The magnetic field obtained is the strongest that has been estimated for binary accreting pulsars. The first 150 days of the outburst and the remaining 200 days revealed a notable difference. Initially there was a strong modulation of the flux with the binary period, while after flux dropped, none was measurable. We interpret this change in terms of a change in the character of the mass exchange onto the neutron star, from accretion from a slow wind to accretion from a fast low density wind. The energy spectra also are correlated with the changes during the orbit and the outburst.
Baykal Ahmet
Stark Michael James
Swank Jean H.
No associations
LandOfFree
Flux-Correlated Changes in the Transient Pulsar SAX J2103+4545 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Flux-Correlated Changes in the Transient Pulsar SAX J2103+4545, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Flux-Correlated Changes in the Transient Pulsar SAX J2103+4545 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1234869