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HD 3472


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Astrometric and astrophysical discontinuities between the galactic old disk and halo stellar populations
Intermediate band, RI, and DDO photometry of the weak-lined stars in thefirst three volumes of the Michigan catalogs of spectral type arediscussed on the basis of luminosity and heavy element abundance. Theinterface between the old disk (Fe/H greater than -0.8 dex) and halo(Fe/H less than -1.2 dex) populations represents discontinuities in boththe stellar motions and the stellar physics. The CN strengths of bothevolved and unevolved halo stars decrease with decreasing temperature,in a mirror image of the increase with decreasing temperature for thedisk objects. The result for the halo giants has been attributed to deepmixing in the stellar atmospheres but the similar result for unevolveddwarfs indicates a difference in formation rather than in evolutionaryprocess of the two populations.

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Observation and Astrometry data

Constellation:Toucan
Right ascension:00h36m54.98s
Declination:-64°52'00.9"
Apparent magnitude:9.796
Proper motion RA:141
Proper motion Dec:23.7
B-T magnitude:10.373
V-T magnitude:9.844

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 3472
TYCHO-2 2000TYC 8844-1213-1
USNO-A2.0USNO-A2 0225-00163467
HIPHIP 2913

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