The impact of the oblateness of Regulus on the motion of its companion

Details The impact of the oblateness of Regulus on the motion of its companion The impact of the oblateness of Regulus on the motion of its companion

2008-07-26

arxiv.org/abs/0807.4221v2

Astrophys.SpaceSci.318:51-55,2008

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

LaTex, 6 pages, 5 figures, 1 table. Accepted by Astrophysics and Space Science

Scientific paper

10.1007/s10509-008-9889-1

The fast spinning B-star Regulus has recently been found to be orbited by a fainter companion in a close circular path with orbital period P_b = 40.11(2) d. Being its equatorial radius R_e 32% larger than the polar one R_p, Regulus possesses a remarkable quadrupole mass moment Q. We investigate the effects of Q on the orbital period P_b of its companion in order to see if they are measurable, given the present-day level of accuracy in measuring P_b. Conversely, we will look for deviations from the third Kepler law, attributed to the quadrupole mass moment Q of Regulus, to constrain the ratio \gamma=m/M of the system's masses.

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