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HD 170809


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관련 글

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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관측 및 측정 데이터

별자리:공작자리
적경:18h37m34.33s
적위:-70°30'52.3"
가시등급:8.472
거리:1075.269 파섹
적경상의 고유운동:4.7
적위상의 고유운동:-63.5
B-T magnitude:9.605
V-T magnitude:8.566

천체목록:
일반명   (Edit)
HD 1989HD 170809
TYCHO-2 2000TYC 9295-912-1
USNO-A2.0USNO-A2 0150-18553778
HIPHIP 91317

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