Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...293..377b&link_type=abstract
Astronomy and Astrophysics 293, 377-380 (1995)
Astronomy and Astrophysics
Astrophysics
7
Stars: Magnetic Fields, Stars: {Alpha} Cmi (Hr 2943), {Beta} Lep (Hr 1829)
Scientific paper
High-precision longitudinal, disc-averaged magnetic field measurements have been made on two late-type stars, α CMi (HR 2943) and β Lep (HR 1829). A magneto-optical filter has been used to measure the degree of circular polarization in the wings of a line of neutral potassium (7699 A) formed in the atmosphere of the target star. From 10 nights of data taken on α CMi on the 1.9-m reflector at the South African Astronomical Observatory (SAAO) in 1993 January, an upper limit to any net longitudinal field component present - assuming the field to be constant over the period of observation - of -0.40+/-0.26G was established. Similarly, upper limits for β Lep of -4.3+/-6.4G and -0.7+/-1.6G were established, from 4 and 10 nights of data taken in 1992 and 1993 January respectively. No significant, periodic, day-to-day variations were seen in the three time series of data.
Bedford David K.
Chaplin William J.
Davies Alan R.
Innis John L.
Isaak George R.
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