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HD 220606


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The late A-type stars - Refined MK classification, confrontation with Stromgren photometry, and the effects of rotation
The MK spectral classification for late A-type stars is refined and theeffects of rotation of spectral classification and uvby(beta) photometryfor these stars are examined. It is found that, for A3 stars, the4417/4481 A wavelength ratio produces results that are inconsistent withthe Stark broadening of the H lines. It is suggested that this ratio isnot useful as a luminosity criterion at any spectral type.Self-consistent sequences of narrow- and broadline standards areestablished. The results of the refined classification system arecompared with Stromgren photometry, showing a set of low-v sin i A-typestars with anomalously large delta(c1) indices for theirluminosity types. It is proposed that these stars are rapid rotatorsseen at fairly low inclination angles.

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观测天体数据

星座:玉夫座
右阿森松:23h25m14.31s
赤纬:-36°11'07.7"
视星:7.856
距离:215.517 天文距离
右阿森松适当运动:25.5
赤纬适当运动:-4.8
B-T magnitude:8.074
V-T magnitude:7.874

目录:
适当名称   (Edit)
HD 1989HD 220606
TYCHO-2 2000TYC 7520-518-1
USNO-A2.0USNO-A2 0525-44230977
HIPHIP 115615

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