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HD 224596


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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:Phoenix
Right ascension:23h59m09.67s
Declination:-42°14'12.8"
Apparent magnitude:6.778
Distance:87.26 parsecs
Proper motion RA:40.2
Proper motion Dec:24.9
B-T magnitude:7.027
V-T magnitude:6.799

Catalogs and designations:
Proper Names
HD 1989HD 224596
TYCHO-2 2000TYC 8018-399-1
USNO-A2.0USNO-A2 0450-40818222
HIPHIP 118256

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