Publication Abstracts

Kelley et al. 1981

Kelley, R.L., S. Rappaport, M.J. Brodheim, L. Cominsky, and R. Stothers, 1981: A search for apsidal motion in 4U0115+63. Astrophys. J., 251, 630-638, doi:10.1086/159509.

We have carred out a pulse arrival-time analysis of the archival Uhuru data from the 1971 transient outburst of the binary X-ray pulsar 4U0115+63. The 3.6 s X-ray pulsations are clearly present in the data, and we show that the average fractional rate of change in pulse period over the 7 yr interval 1971-1978 corresponds to Ṗ/P = -2×10-6 / yr. This spin-up rate is consistent with an average source luminosity ∼20 times less than that observed during its flare state. The pulse arrival times were tracked for ∼7 d, and by combining these data with the 1978 SAS 3 orbital determination, we place a limit on the advance of periastron in the 4U0115+63 system of ω̇ ≲ 2.1° /yr (95% confidence). The analysis also yields an improved value for the orbital period, Porb = 24.3162°. The constraints on the companion star imposed by the limit on apsidal motion are discussed.

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BibTeX Citation

  author={Kelley, R. L. and Rappaport, S. and Brodheim, M. J. and Cominsky, L. and Stothers, R.},
  title={A search for apsidal motion in 4U0115+63},
  journal={Astrophysical Journal},

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RIS Citation

ID  - ke05000n
AU  - Kelley, R. L.
AU  - Rappaport, S.
AU  - Brodheim, M. J.
AU  - Cominsky, L.
AU  - Stothers, R.
PY  - 1981
TI  - A search for apsidal motion in 4U0115+63
JA  - Astrophys. J.
JO  - Astrophysical Journal
VL  - 251
SP  - 630
EP  - 638
DO  - 10.1086/159509
ER  -

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