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HD 210851


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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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观测天体数据

星座:南魚座
右阿森松:22h13m53.03s
赤纬:-34°45'35.4"
视星:7.657
距离:111.235 天文距离
右阿森松适当运动:64.9
赤纬适当运动:-2.3
B-T magnitude:8.053
V-T magnitude:7.69

目录:
适当名称   (Edit)
HD 1989HD 210851
TYCHO-2 2000TYC 7499-1225-1
USNO-A2.0USNO-A2 0525-43709881
HIPHIP 109755

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