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HD 221806


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Bright Metal-poor Stars from the Hamburg/ESO Survey. I. Selection and Follow-up Observations from 329 Fields
We present a sample of 1777 bright (91.0) metal-poor([Fe/H]<-2.0) giants of 9%+/-2%, which is lower than previouslyreported. However, the frequency rises to similar (>20%) and highervalues with increasing distance from the Galactic plane. Although thenumbers of stars at low metallicity are falling rapidly at the lowestmetallicities, there is evidence that the fraction of carbon-enhancedmetal-poor stars is increasing rapidly as a function of decliningmetallicity. For ~60 objects, high-resolution data have already beenobtained; one of these, HE 1327-2326, is the new record holder for themost iron-deficient star known.

UVBY photometry of HIPPARCOS stars
Photoelectric data in the uvby system have been obtained for 367southern stars of the Hipparcos Input Catalogue. Most of the stars are Fand G main sequence and fall in the magnitude range V = 9 to 10.

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观测天体数据

星座:鳳凰座
右阿森松:23h35m24.49s
赤纬:-44°14'50.9"
视星:10.005
右阿森松适当运动:-81.3
赤纬适当运动:-34.4
B-T magnitude:10.707
V-T magnitude:10.063

目录:
适当名称   (Edit)
HD 1989HD 221806
TYCHO-2 2000TYC 8020-644-1
USNO-A2.0USNO-A2 0450-40676066
HIPHIP 116413

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