HD 15144, a magnetic AP star with a possible intrinsic periodic variation of the magnetic field

Details HD 15144, a magnetic AP star with a possible intrinsic periodic variation of the magnetic field HD 15144, a magnetic AP star with a possible intrinsic periodic variation of the magnetic field

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pasp...93..756b&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 93, Dec. 1981, p. 756-764.

Astronomy and Astrophysics

Astronomy

11

A Stars, Binary Stars, Magnetic Stars, Radial Velocity, Stellar Magnetic Fields, Zeeman Effect, Magnetic Flux, Orbital Elements, Stellar Luminosity, Stellar Models, Stellar Rotation, Stellar Temperature

Scientific paper

Radial-velocity and Zeeman effect observations of HD 15144 obtained at Mauna Kea Observatory in 1971 are discussed in conjunction with observations made by Babcock in 1958. The conclusion that the star is a single-lined spectroscopic binary with a period of 3.00 days (Babcock, 1958) is confirmed, and the elements of the orbit are derived. Babcock's conclusion that the magnetic field does not vary with the orbital period is also confirmed, and a probable magnetic period of 15.9 days is derived. The apparent rotational velocity is found to be 7.7 + or - 0.4 km/sec, from which it is assumed that the system has a normal configuration, with the rotational equator of the star coinciding with the orbital plane. Two models for the system are presented, the more plausible of which maintains that the system is seen nearly pole-on, that the secondary is a subluminous star of approximately 1.2 solar mass, and that the magnetic variation is due to intrinsic changes of the field strength or geometry.

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