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HD 170809


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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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观测天体数据

星座:孔雀座
右阿森松:18h37m34.33s
赤纬:-70°30'52.3"
视星:8.472
距离:1075.269 天文距离
右阿森松适当运动:4.7
赤纬适当运动:-63.5
B-T magnitude:9.605
V-T magnitude:8.566

目录:
适当名称   (Edit)
HD 1989HD 170809
TYCHO-2 2000TYC 9295-912-1
USNO-A2.0USNO-A2 0150-18553778
HIPHIP 91317

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