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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: | Pavo |
| 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:
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