HD 64740

This is a massive B-type main-sequence star with a stellar classification of B2V. It is a magnetic chemically peculiar star of the helium strong variety with weak hydrogen alpha emission. The polar magnetic field strength is 3,700 G. The star is about halfway through its main sequence lifetime with an estimated age of ~13 million years. It is spinning rapidly with an equatorial velocity of about 140±10 km/s, based on a polar inclination angle of 36°±15°, giving it a rotation period of ~1.33 days. The star is radiating over 5,900 times the luminosity of the Sun from its photosphere at an effective temperature of 23,700 K.

Significant X-ray emission has been detected originating from this star, which may be connected to the magnetically confined stellar wind. The star does not display pulsation behavior, but it does show a magnetically modulated variation from the wind. Variation of ultraviolet lines of silicon has been detected, which may be due to surface abundance variations. Two patches of helium overabundance are observed near the magnetic poles, which are inclined by about 20° to the star's pole of rotation.