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HD 197431


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Behavior of the CA II-K line in the cool AP star HD 197417
The southern cool peculiar star HD 197417 shows a large variation in thephotometric index c1. Spectroscopic investigations point outvariations in the profile and equivalent width of the Ca II-K line,which are correlated with those of the Sr II, Eu II, Fe II and Cr IIlines. The possibility that this periodic behavior of the Ca II-K linemay be due to UV blanketing or to diffusion effects is investigated. Theappearance of wings at the maximum of intensity of the Ca II-K line isdiscussed.

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Observation and Astrometry data

Constellation:Pfau
Right ascension:20h49m00.84s
Declination:-72°31'57.8"
Apparent magnitude:7.225
Distance:295.858 parsecs
Proper motion RA:10
Proper motion Dec:-19.2
B-T magnitude:7.202
V-T magnitude:7.224

Catalogs and designations:
Proper Names
HD 1989HD 197431
TYCHO-2 2000TYC 9329-1072-1
USNO-A2.0USNO-A2 0150-19618329
HIPHIP 102730

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