Rappaport et al. 1980

Rappaport, S., P.C. Joss, and R. Stothers, 1980: The apsidal motion test in 4U 0900-40. Astrophys. J., 235, 570-575, doi:10.1086/157660.

Recent SAS 3 observations of 4U 0900-40 have confirmed the apparent eccentricity of the orbit. Argument are given to show that the measured eccentrcity is not a spurious effect resulting from systematic reflection of the X-ray beam within the binary system. The longitude of periastron is not observed to have advanced in the 3.5 years since its original determination. The limit on apsidal motion is ώ ≲ 3.8° / yr which, in turn, restricts the apsidal motion constant to lok k ≲ -2.5. These limits are used to constrain the physical parameters of the companion star HD 77581.

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Rappaport, S., Joss, P.C., and Stothers, R.: The apsidal motion test in 4U 0900-40, Astrophys. J., 235, 570-575, doi:10.1086/157660, 1980.

Rappaport, S., P.C. Joss, and R. Stothers (1980), The apsidal motion test in 4U 0900-40, Astrophys. J., 235, 570-575, doi:10.1086/157660.

Rappaport, S., P.C. Joss, and R. Stothers, 1980: The apsidal motion test in 4U 0900-40. Astrophys. J., 235, 570-575, doi:10.1086/157660.

Rappaport, S., Joss, P.C., & Stothers, R. 1980, Astrophys. J., 235, 570, doi:10.1086/157660.

Rappaport S, Joss PC, Stothers R. The apsidal motion test in 4U 0900-40, Astrophys J 1980;235:570-575. doi:10.1086/157660.

S. Rappaport, P.C. Joss, R. Stothers, Astrophys. J. 235, 570-575, doi:10.1086/157660 (1980).