Rotation and magnetism in white dwarfs

Abstract

view Abstract Citations (62) References (30) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Rotation and Magnetism in White Dwarfs Schmidt, Gary D. ; Norsworthy, Jane E. Abstract New rotational ephemerides for four isolated magnetic white dwarfs are derived from more than a decade of polarimetric monitoring. The stars span the period range 99 min-17.9 days and effectively double the number of white dwarfs with measured rotation periods. In addition, five stars whose polarization is constant on time scales up to at least 10 years may have very long rotation periods (P greater than about 100 yr). The lack of very short period white dwarfs attests to the coupling of angular momentum into the giant envelope or interstellar medium during late stages of evolution, but thus far there is no evidence that this process involves magnetic braking. With few exceptions, the disk-averaged fields of magnetic degenerates are dominated by dipolar patterns (as opposed to higher order multipoles or spots), and cover a broad range of obliquity to the rotation axis. Publication: The Astrophysical Journal Pub Date: January 1991 DOI: 10.1086/169559 Bibcode: 1991ApJ...366..270S Keywords: Magnetic Stars; Stellar Rotation; White Dwarf Stars; Polarimetry; Polarized Radiation; Stellar Envelopes; Stellar Magnetic Fields; Stellar Structure; Astrophysics; STARS: MAGNETIC; STARS: ROTATION; STARS: WHITE DWARFS full text sources ADS | data products SIMBAD (10)