Home     To Survive in the Universe    
Services
    Why to Inhabit     Top Contributors     Astro Photo     The Collection     Forum     Blog New!     FAQ     Login  

HD 217990


Contents

Images

Upload your image

DSS Images   Other Images


Related articles

Interstellar polarization from observations of A and F stars in high and intermediate galactic latitudes, and from stars in the Mathewson and Ford polarization catalogue
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1986A&AS...64..487K&db_key=AST

The chemical evolution of the solar neighborhood. I - A bias-free reduction technique and data sample
The possible ways of measuring the age-metallicity relation for thegalactic disk in the neighborhood of the sun are discussed. It is shownthat the use of a field star sample chosen on the basis of effectivetemperature introduces a bias which results in a monotonic increase inthe metal abundance of the disk with time. However, if theage-metallicity relation for the disk can be shown to satisfy certaincriteria, the bias introduced in such a sample can be neglected: thegalactic disk apparently satisfies the criteria. It is concluded that asample analyzed through the use of uvby and H(beta) photometry inconjunction with a self-consistent set of theoretical isochronesprovides the least biased, most accurate estimate of the age-metallicityrelation for the disk.

Submit a new article


Related links

  • - No Links Found -
Submit a new link


Member of following groups:

Observation and Astrometry data

Constellation:Tucana
Right ascension:23h05m27.13s
Declination:-58°53'57.5"
Apparent magnitude:7.841
Distance:148.588 parsecs
Proper motion RA:30.1
Proper motion Dec:14.5
B-T magnitude:8.183
V-T magnitude:7.87

Catalogs and designations:
Proper Names
HD 1989HD 217990
TYCHO-2 2000TYC 8830-31-1
USNO-A2.0USNO-A2 0300-37866814
HIPHIP 114019
→ Request more catalogs and designations from VizieR