Open AccessApsidal motion in 4U 0115+63 and orbital parameters of 2S 1417−624 and V0332+53
Author(s) -
Raichur Harsha,
Paul Biswajit
Publication year - 2010
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2010.16862.x
Subject(s) - apsidal precession , physics , pulsar , neutron star , astrophysics , orbit (dynamics) , orbital elements , orbital motion , binary number , binary star , star (game theory) , proper motion , orbital eccentricity , astronomy , x ray pulsar , stars , classical mechanics , planet , angular momentum , arithmetic , mathematics , engineering , aerospace engineering
ABSTRACT Be/X‐ray binary pulsars have wide eccentric orbits and hence the angle of periastron of the orbit is very well defined in these sources. The presence of an X‐ray pulsar allows for accurate measurements of orbital elements. A Be star usually is a rapidly rotating star and hence will deviate from spherical geometry. The tidal interaction between the neutron star and the Be star will add to the distortion of the Be star and alter its mass distribution. Thus a measurable rate of apsidal motion is expected from these systems. In this paper, we present the first conclusive detection of apsidal motion of the binary 4U 0115+63. We also present new and accurate orbital parameters of the Be/X‐ray binaries V0332+53 and 2S 1417− 624.