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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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관측 및 측정 데이터

별자리:조각가자리
적경:23h25m14.31s
적위:-36°11'07.7"
가시등급:7.856
거리:215.517 파섹
적경상의 고유운동:25.5
적위상의 고유운동:-4.8
B-T magnitude:8.074
V-T magnitude:7.874

천체목록:
일반명   (Edit)
HD 1989HD 220606
TYCHO-2 2000TYC 7520-518-1
USNO-A2.0USNO-A2 0525-44230977
HIPHIP 115615

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