The incidence of magnetism among white dwarfs: The first stars below 100 kilogauss

Details The incidence of magnetism among white dwarfs: The first stars below 100 kilogauss The incidence of magnetism among white dwarfs: The first stars below 100 kilogauss

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...423l..63s&link_type=abstract

Astrophysical Journal, Part 2 - Letters, vol. 423, no. 1, p. L63-L65

Astronomy and Astrophysics

Astrophysics

30

Astrophysics, Circular Polarization, H Alpha Line, H Beta Line, Incidence, Northern Hemisphere, Stellar Magnetic Fields, White Dwarf Stars, Cameras, Charge Coupled Devices, Gratings (Spectra), Polarimeters, Spectrometers, Telescopes

Scientific paper

A survey for magnetic fields among a magnitude-limited sample of DA white dwarfs has identified two stars with weak circular polarization features across the profiles of H(alpha) and H(beta) WD 1350-090 (LP 907-037) was found to have a disk-averaged longitudinal field component Be = +85 +/- 9 kG at one epoch, while WD 0009+501 (G 217-037) has been measured on several occasions at values between Be approximately 0 and nearly -100 kG. The latter results imply an oblique rotator with a period between 2 and 20 hr. Magnetism on white dwarfs has now been detected over more than four orders of magnitude in strength. Assuming flux conservation, the new discoveries imply organized field patterns near the end of the main-sequence phase of only approximately 10 G. However, the overall incidence of magnetism among white dwarfs remains low, with more than 90% of stars having fields below approximately 10 kG. There is tentative evidence from line profile analysis that WD 1350-090 is a high-mass object (M greater than 1 solar mass), but an accurate parallax and more thorough spectroscopic study are required.

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