The Magnetically Variable Star HD 153882.
Abstract
The reversing magnetic field of the peculiar A-type star HD 153882 has been investigated on twenty spectrograms made with the double analyzer for circularly polarized light. The effective magnetic field intensity at the pole, H , as determined from measures of the Zeeman effect on about thirty jines on each plate, varies periodically between the limits t4SOO gauss and - 4000 gauss. The derived period is 6.005 days. Measures of Hp and of radial velocity have been tabulated for elements at various phases. The mean velocity-curve is anharmonic, with a range of 5.3 Irm/sec. Systematic velocity differences between elements are small; this is probably related to the fact that the spectrum shows little or no variability in relative line intensities. The spectrum is peculiar in that Cr I, Cr Ir, and Mn I are strong, and the K line is sharp, but the star is not a typical spectrum variable. A cross-over effect in the polarized line profiles, rather similar to that previously found in lID 125248 and in a2 CVn, was observed at phases when the effective magnetic field is near zero.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- January 1953
- DOI:
- 10.1086/145663
- Bibcode:
- 1953ApJ...117...12G