Intermediate band photometry of the CP2-star HD 220825 (Kap Psc).
Abstract
Differential photoelectric photometry in eight intermediate band filters including the Stromgren system is reported for the Strontium star HD 220825 which has been subject of controversial period determinations. The data lend support to a rotational period of P = 1.412 days, significantly larger than the old half-day period which is shown to be an adjacent alias. This way, the nearly pole-on aspect as well as the unusually low R sin i value of Kappa Piscium disappear. Variability of the Balmer lines is indicated by enhanced variation in broad width H-gamma and H-beta filters. The amplitudes of variation increase from 15 mmags in Stromgren-y to 35 mmags in Stromgren-u.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- June 1991
- Bibcode:
- 1991A&A...246..346K
- Keywords:
-
- A Stars;
- Peculiar Stars;
- Spectral Bands;
- Stellar Rotation;
- Stellar Spectrophotometry;
- Variable Stars;
- Balmer Series;
- Light Curve;
- Optical Filters;
- Power Spectra;
- Astrophysics