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HD 221943


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Pulkovo compilation of radial velocities for 35495 stars in a common system.
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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.

UBVRI photometry of stars useful for checking equipment orientation stability
Several sets of stars have been measured, equally spaced around the skyin right ascension, over a range in declination from -75 deg to +30 deg.The goal was to obtain a number of well-observed stars with qualityinternally consistent magnitudes and color indices. The stars wereneeded to check orientation effects of photometric equipment.

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Dades d'Observació i Astrometria

Constel·lació:Phoenix
Ascensió Recta:23h36m34.04s
Declinació:-44°53'34.2"
Magnitud Aparent:6.916
Distancia:85.106 parsecs
Moviment propi RA:93.2
Moviment propi Dec:-23.9
B-T magnitude:7.143
V-T magnitude:6.935

Catàlegs i designacions:
Noms Propis   (Edit)
HD 1989HD 221943
TYCHO-2 2000TYC 8020-1145-1
USNO-A2.0USNO-A2 0450-40683033
HIPHIP 116510

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