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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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Observation and Astrometry data

Constellation:ちょうこくしつ座
Right ascension:23h25m14.31s
Declination:-36°11'07.7"
Apparent magnitude:7.856
Distance:215.517 parsecs
Proper motion RA:25.5
Proper motion Dec:-4.8
B-T magnitude:8.074
V-T magnitude:7.874

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 220606
TYCHO-2 2000TYC 7520-518-1
USNO-A2.0USNO-A2 0525-44230977
HIPHIP 115615

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