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HD 216290


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The early F-type stars - Refined classification, confrontation with Stromgren photometry, and the effects of rotation
The classification for early F-type stars in the MK spectralclassification system presented by Gray and Garrison (1987) is refined.The effect of rotation on spectral classification and ubvy-betaphotometry of early F-type stars is examined. It is found that theclassical luminosity criterion, the 4417 A/4481 A ratio givesinconsistent results. It is shown that most of the stars in the DeltaDelphini class of metallic-line stars are either normal or areindistinguishable from proto-Am stars. It is suggested that thedesignation Delta Delphini should be dropped. The classifications arecompared with Stromgren photometry. The effects of rotation on thedelta-c1 index in the early-F field dwarfs is demonstrated.

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Observation and Astrometry data

Constellation:Pisces Austrinus
Right ascension:22h52m10.75s
Declination:-34°38'03.1"
Apparent magnitude:7.837
Distance:221.729 parsecs
Proper motion RA:21.1
Proper motion Dec:-10.9
B-T magnitude:8.19
V-T magnitude:7.867

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 216290
TYCHO-2 2000TYC 7508-942-1
USNO-A2.0USNO-A2 0525-44017141
HIPHIP 112925

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