Intermediate band photometry of the CP2-star HD 220825 (Kappa Psc)

Details Intermediate band photometry of the CP2-star HD 220825 (Kappa Psc) Intermediate band photometry of the CP2-star HD 220825 (Kappa Psc)

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...246..346k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 246, no. 2, June 1991, p. 346-348. Research supported by BMFWF.

Astronomy and Astrophysics

Astrophysics

6

A Stars, Peculiar Stars, Spectral Bands, Stellar Rotation, Stellar Spectrophotometry, Variable Stars, Balmer Series, Light Curve, Optical Filters, Power Spectra

Scientific paper

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.

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