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HD 222996


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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.

A finding list of early-type stars near the south galactic pole.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1971AJ.....76..338S&db_key=AST

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Observation and Astrometry data

Constellation:Sculptor
Right ascension:23h45m52.73s
Declination:-32°55'37.8"
Apparent magnitude:8.183
Distance:325.733 parsecs
Proper motion RA:3.9
Proper motion Dec:2.8
B-T magnitude:8.405
V-T magnitude:8.202

Catalogs and designations:
Proper Names
HD 1989HD 222996
TYCHO-2 2000TYC 7518-630-1
USNO-A2.0USNO-A2 0525-44354850
HIPHIP 117204

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