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TYC 2531-2020-1

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Pulkovo compilation of radial velocities for 35495 stars in a common system. Not Available
A kinematic and abundance survey at the Galactic poles. III A sample of 418 space velocities are examined, including 83 new valuesobtained for G5-K6 giants near the North Galactic Pole. A constantDDO-derived Fe/H abundance gradient of about -0.18 dex/kpc is found toextend to 8 kpc. The data show a continuous increase in the velocitydispersion as the distance above the Galactic plane increases and as theDDO-derived Fe/H abundance ratio decreases to -1.00. The data suggest akinematic decoupling of the thick disk and halo stars. As in the case ofthe abundance gradient, the kinematic data are shown to be consistentwith the concept of the galactic-model components. It is noted thatgiants with solar DDO-derived abundances are found only sparsely in thethick disk.
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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Gözlemler ve gökölçümü verileri

Takýmyýldýz:	Av Kopekleri
Sað Açýklýk:	12^h47^m35.74^s
Yükselim:	+32Â°50'37.6"
Görünürdeki Parlaklýk:	9.005
özdevim Sað Açýklýk:	-11
özdevim Yükselim:	-18.6
B-T magnitude:	10.837
V-T magnitude:	9.157

Kataloglar ve belirtme:

Özgün isimleri	(Edit)
TYCHO-2 2000	TYC 2531-2020-1
USNO-A2.0	USNO-A2 1200-06953561
HIP	HIP 62425

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