Mathematics
Scientific paper
Apr 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998ycat..33350973w&link_type=abstract
VizieR On-line Data Catalog: J/A+A/335/973. Originally published in: 1998A&A...335..973W
Mathematics
Stars: Peculiar, Stars: Be, Stars: Bp, Photometry: Uvby
Scientific paper
We present new longitudinal magnetic field and Stroemgren photometric measurements of the Bp star 84 UMa. From these data we determine a new rotational period Prot=1.38576+/-0.00080d, which is inconsistent with previously published values. The magnetic measurements indicate the presence of a weak, dominantly dipolar magnetic field in the photosphere of 84 UMa. We employ a new value of the rotational axis inclination in conjunction with the magnetic data in order to constrain the magnetic field geometry. We derive the following dipole oblique rotator parameters: i=59+17-9°, β=48+17-29°, and Bd=1620+1270-30G. A precise value of the radius (which we calculate in conjunction with the inclination using the Hipparcos parallax) allows us to locate 84 UMa on the radius-effective temperature plane. Using theoretical evolutionary tracks (Schaller et al., 1992, Cat.
Adelman Saul J.
Bastien Pierre
Hill Grant Michael
Manset Nadine
Wade Gregg A.
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