HD 9931

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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.

Stellar population samples at the galactic poles. III - UBVRI observations of proper motion stars near the south pole and the luminosity laws for the halo and old disk populations
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1976ApJS...30..351E&db_key=AST

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Dades d'Observació i Astrometria

Constel·lació:	Cetus
Ascensió Recta:	01^h36^m45.07^s
Declinació:	-21Â°26'58.9"
Magnitud Aparent:	9.968
Moviment propi RA:	12.6
Moviment propi Dec:	-25.6
B-T magnitude:	10.655
V-T magnitude:	10.025

Catàlegs i designacions:

Noms Propis	(Edit)
HD 1989	HD 9931
TYCHO-2 2000	TYC 5857-61-1
USNO-A2.0	USNO-A2 0675-00574957
HIP	HIP 7507

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