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HD 220506


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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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Сазвежђа:Ждрал
Ректацензија:23h24m26.61s
Deклинација:-37°12'03.4"
Apparent магнитуда:7.342
Даљина:250 parsecs
Proper motion RA:-10.6
Proper motion Dec:-5.1
B-T magnitude:7.477
V-T magnitude:7.354

Каталог и designations:
Proper имена
HD 1989HD 220506
TYCHO-2 2000TYC 7520-130-1
USNO-A2.0USNO-A2 0525-44226098
HIPHIP 115556

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