Oppenheimer-Volkoff limit
McGraw-Hill Science & Technology Dictionary:
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Oppenheimer-Volkoff limit
(′äp·ən′hī·mər ′föl′köf ′lim·ət)
(astronomy) The upper limit on the mass of a neutron star, above which there is no stable equilibrium configuration and it is predicted that matter will collapse into a black hole.
Wiley Book of Astronomy:
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Oppenheimer-Volkoff limit
The upper limit for the mass of a neutron star beyond which it must collapse to become a black hole (or, possibly, a quark star). Its value is not known exactly because the properties of neutron degenerate matter can only be estimated, but it is generally thought to be about 2 or 3 MSun.
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