Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprn17064l&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
The X-ray source KS1947+300 was discovered in 1989 with TTM/Kvant and was soon identified with a plausible blue stellar counterpart. Extensive RXTE observations of the source during a long outburst between 2000 November and 2001 June established that it is an X-ray pulsar (GRO J1948+32; period 18.7 s) that was studied in 1994 with BATSE. We have derived pulse frequency estimates from the RXTE/PCA observations. These show substantial spin up of the neutron star and a smaller amplitude sinusoidal modulation that must be due to orbital motion. The RXTE data alone show that the orbital period is close to 40 days. Joint analysis of the RXTE and the earlier BATSE data further constrain the period. The orbital eccentricity is found to be in the range 0.022--0.028, which is low for a Be/X-ray binary. The mass function is close to 2 solar masses. The RXTE observations provide an excellent opportunity to study the torque-luminosity relationship over an extended time interval. We also present results that show the evolution of the pulse shape and the pulse fraction through the outburst.
Galloway Duncan
Levine Alan
Morgan Edward
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