NASA NTRS · 19760052422
The 3U 0900-40 binary system - Orbital elements and masses
Abstract
Observations of the 283-s X-ray pulsations from 3U 0900-40 (Vela X-1) over a 36-day interval have led to a determination of the orbital elements for the X-ray star. These elements yield an X-ray mass function of about 18.5 solar masses and, when combined with the results of optical studies of the companion star HD 77581, give a probable lower limit of 1.4 solar masses to the mass of the X-ray star.
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Rappaport, S., Joss, P. C., Mcclintock, J. E.. 1976-06-01. The 3U 0900-40 binary system - Orbital elements and masses. https://ntrs.nasa.gov/citations/19760052422
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