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The Precataclysmic Binary HS 1136+6646 May Have a Companion
Holberg, J. B.; Sing, D. K.; Liebert, James +1 more
Because of the similarity of the primary star of HS 1136+6646 to the planetary nebula central star BE Ursae Majoris, we performed wide-field imaging of the former with an Hα filter. No nebulosity was detected. On the other hand, the point-spread function of the star appears extended. A partially resolved red component is detected in an image from …
Measuring the Mass of 4U 0900-40 Dynamically
Boyd, Patricia T.; Dolan, J. F.; Etzel, Paul B.
Accurate measurements of neutron star masses are needed to constrain the equation of state of neutron star matter-of importance to both particle physics and the astrophysics of neutron stars-and to identify the evolutionary track of the progenitor stars that form neutron stars. The best measured values of the mass of 4U 0900-40 (=Vela XR-1), 1.86+…