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HD 215863


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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:みなみのうお座
Right ascension:22h48m40.82s
Declination:-34°46'23.1"
Apparent magnitude:7.698
Distance:170.358 parsecs
Proper motion RA:-12.7
Proper motion Dec:4.4
B-T magnitude:7.865
V-T magnitude:7.712

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 215863
TYCHO-2 2000TYC 7508-640-1
USNO-A2.0USNO-A2 0525-43991630
HIPHIP 112631

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