Surface gravity of neutron stars and strange stars

Details Surface gravity of neutron stars and strange stars Surface gravity of neutron stars and strange stars

2004-03-23

arxiv.org/abs/astro-ph/0403550v1

Astron.Astrophys. 420 (2004) 987-991

Astronomy and Astrophysics

Astrophysics

Accepted by A&A

Scientific paper

10.1051/0004-6361:20034538

The upper bound on the value of the surface gravity, g_s, for neutron stars with equations of state respecting v_sound <= c, is derived. This bound is inversely proportional to the maximum allowable mass M_max, and it reads g_s <= 1.411 x 10^15 (M_sun/M_max) cm/s^2. It implies an absolute upper bound 7.4 x 10^14 cm/s^2 if one uses the 2sigma lower bound on the neutron mass measured recently in 4U1700-37, 1.9 M_sun. A correlation between g_s and the compactness parameter 2GM/Rc^2 for baryonic stars is analyzed. The properties of g_s of strange quark stars and its upper bounds are discussed using the scaling properties of the strange-star models.

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