Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003astl...29..737f&link_type=abstract
Astronomy Letters, vol. 29, p. 737-747 (2003)
Astronomy and Astrophysics
Astronomy
9
Scientific paper
We describe the results of our magnetometric monitoring of two white dwarfs: 40 Eri B and WD 0009+501. We found periodic variations in the longitudinal magnetic field of 40 Eri B. The field variability with an amplitude of ~4 kG and a zero mean is discussed in terms of an oblique rotator model. The rotation period is ~5 h 17 min, but there is another period of 2 h 25 min that may be related to nondipolar field components. The published projected rotational velocities of 40 Eri B measured from a narrow non-LTE H_alpha peak (V sin i < 8 km/s) are in good agreement with our measurements of the magnetic field and the rotation period. The combined effect of magnetic and rotational broadening of the central H_alpha component constrains the rotation period, P > 5.2 h. We discovered the rotation period (1.83 h) of the magnetic white dwarf WD 0009+501. The period was found from the periodically varying magnetic field of the star with a mean
Burlakova Tatyana E.
Fabrika Sergei N.
Valyavin Gennady G.
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