Home     Getting Started     To Survive in the Universe    
Inhabited Sky
    News@Sky     Astro Photo     The Collection     Forum     Blog New!     FAQ     Press     Login  

HD 170809


Contents

Images

Upload your image

DSS Images   Other Images


Related articles

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.

Submit a new article


Related links

  • - No Links Found -
Submit a new link


Member of following groups:


Observation and Astrometry data

Constellation:Pavo
Right ascension:18h37m34.33s
Declination:-70°30'52.3"
Apparent magnitude:8.472
Distance:1075.269 parsecs
Proper motion RA:4.7
Proper motion Dec:-63.5
B-T magnitude:9.605
V-T magnitude:8.566

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 170809
TYCHO-2 2000TYC 9295-912-1
USNO-A2.0USNO-A2 0150-18553778
HIPHIP 91317

→ Request more catalogs and designations from VizieR