M1 − M2 phase space diagram showing the possible mass ranges for BD +60 73 (M1) and the compact secondary (M2) for a variety of orbital inclinations using the derived mass function of f(M/M⊙) = 0.009 ± 0.002. The slanted dotted and dashed lines outline the 1σ and 3σ upper and lower bounds for the possible mass of the primary for i = 60°. The horizontal dashed lines show a reasonable range for the upper and lower mass-limits of a neutron star (Lattimer & Prakash 2005).
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