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HD 210139


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SANTIAGO 91, a right ascension catalogue of 3387 stars (equinox J2000).
The positions in right ascension of 3387 stars belonging to the Santiago67 Catalogue, observed with the Repsold Meridian Circle at Cerro Calan,National Astronomical Observatory, during the period 1989 to 1994, aregiven. The average mean square error of a position, for the wholeCatalogue, is +/-0.009 s. The mean epoch of the catalogue is 1991.84.

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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观测天体数据

星座:南魚座
右阿森松:22h08m45.83s
赤纬:-25°46'13.2"
视星:7.119
距离:190.114 天文距离
右阿森松适当运动:39.7
赤纬适当运动:-37.8
B-T magnitude:7.334
V-T magnitude:7.137

目录:
适当名称   (Edit)
HD 1989HD 210139
TYCHO-2 2000TYC 6958-1446-1
USNO-A2.0USNO-A2 0600-43974527
HIPHIP 109312

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