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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: | Südlicher Fisch |
| 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:
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