4. HD 86592
Bidelman (1981) classified HD 86592 as a SrEu star. Babel & North (1997) discovered a very strong magnetic field of 15 to 16 kG, estimated v sin i = 162 km s-1, and found photometric variability from 24 photometric measurements in the Geneva system:
HJD (max. flux Geneva B mag.)
Forty-five and 77 sets of good Strömgren differential observations were made with the FCAPT during the 1997-98 and 1998-99 observing seasons, respectively (Table 4). The period finding techniques yield the same period as Babel & North whose photometry covers a much long time period, but whose coverage is far sparser. The new photometry defines more subtle variations in the light curves. These values are plotted in Fig. 3. The B light curve of Babel & North shows the same minimum as those of u , b , and v which are in phase. It will require another set of observations to improve the ephemeris.
HD 86582 is a large amplitude variable in v (0.13 mag.) while in u , b , and y the amplitudes are 0.04, 0.04, and 0.018 mag., respectively. The variability in y is very crudely, but not perfectly in antiphase with those of u , v , and b as its maximum occurs near phase 0.5 rather than 0.35. Thus there must be an approximately non-variable wavelength region between the mean wavelengths of b and y . The halt in the rise of the rising branch of the light curve near phase 0.75 which is seen in v may also weakly occur in b .
© European Southern Observatory (ESO) 2000
Online publication: June 5, 2000