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TYC 2531-619-1

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A kinematic and abundance survey at the galactic poles The DDO intermediate band system is used to obtain detailed informationabout abundance gradients and velocity dispersions in the galaxy, withan emphasis on the properties of halo stars in the range of from 1 to 5kpc. The DDO abundance index is calibrated agianst (Fe/H) for metal-poorstars, with a resulting gradient of about -0.2 per kpc. However, whenthe sample is divided into two subsamples with (Fe/H) less than -0.5 andequal to or greater than -0.5, the gradients are -0.14 and 0.00,respectively. DDO observations of about 1000 stars, mostly G5-K5 giants,show that the velocity dispersion increases both with decrease inmetallicity and increase in z distance. The abundances found for high-zstars are similar to the A-star results of Rodgers (1971) in that abouthalf the K giants above 1 kpc appear to have solar abundances.
UBVRI photometry of north galactic pole K giants Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1970AJ.....75..971H&db_key=AST
The space distribution of late type stars in a North galactic pole region. Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1962AJ.....67...37U&db_key=AST
Investigations on the stars in high galactic latitudes. III. Spectrophotometric analysis of about 3000 stars down to the photographic magnitude 13.5. Not Available

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Osservazione e dati astrometrici

Costellazione:	Chioma di Berenice
Ascensione retta:	12^h44^m08.52^s
Declinazione:	+30Â°09'05.8"
Magnitudine apparente:	9.815
Moto proprio RA:	1.9
Moto proprio Dec:	-33.8
B-T magnitude:	11.23
V-T magnitude:	9.932

Cataloghi e designazioni:

Nomi esatti	(Edit)
TYCHO-2 2000	TYC 2531-619-1
USNO-A2.0	USNO-A2 1200-06943754
HIP	HIP 62139

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