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HD 191220


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Lists of photometric AM candidates
The Geneva photometric m parameter (Nicolet and Cramer, 1982) is used inorder to select Am photometric candidates from the Rufener (1981)catalogue. Two lists are given, the first containing field stars and thesecond cluster stars. According to the photometric criteria thediffusion process probably responsible for the Am phenomenon takes placerather quickly as Am candidates are present in young clusters. It isconfirmed that the phenomenon is enhanced by low rotational velocity andhigh metallicity. The age seems to slightly affect the Am phenomenon.

Erratum - Discordances Between SAO and HD Numbers for Bright Stars
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观测天体数据

星座:南極座
右阿森松:20h24m54.40s
赤纬:-83°18'38.0"
视星:6.17
距离:77.22 天文距离
右阿森松适当运动:23.2
赤纬适当运动:7.1
B-T magnitude:6.401
V-T magnitude:6.169

目录:
适当名称
HD 1989HD 191220
TYCHO-2 2000TYC 9524-1767-1
USNO-A2.0USNO-A2 0000-01760155
BSC 1991HR 7698
HIPHIP 100697

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