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HD 18450


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K dwarfs and the chemical evolution of the solar cylinder
K dwarfs have lifetimes older than the present age of the Galactic disc,and are thus ideal stars for investigating the chemical evolution of thedisc. We have developed several photometric metallicity indicators for Kdwarfs, based on a sample of accurate spectroscopic metallicities for 34disc and halo G and K dwarfs. The photometric metallicities lead us todevelop a metallicity index for K dwarfs based only on their position inthe colour-absolute-magnitude diagram. Metallicities have beendetermined for 431 single K dwarfs drawn from the Hipparcos catalogue,selecting the stars by absolute magnitude and removing multiple systems.The sample is essentially a complete reckoning of the metal content innearby K dwarfs. We use stellar isochrones to mark the stars by mass,and select a subset of 220 of the stars, which is complete within anarrow mass interval. We fit the data with a model of the chemicalevolution of the solar cylinder. We find that only a modest cosmicscatter is required to fit our age-metallicity relation. The modelassumes two main infall episodes for the formation of the halo-thickdisc and thin disc, respectively. The new data confirm that the solarneighbourhood formed on a long time-scale of the order of 7 Gyr.

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Observation and Astrometry data

Constellation:おひつじ座
Right ascension:02h58m52.43s
Declination:+26°46'26.7"
Apparent magnitude:8.224
Distance:28.571 parsecs
Proper motion RA:-17.3
Proper motion Dec:125.7
B-T magnitude:9.346
V-T magnitude:8.317

Catalogs and designations:
Proper Names
HD 1989HD 18450
TYCHO-2 2000TYC 1790-814-1
USNO-A2.0USNO-A2 1125-00957166
HIPHIP 13891

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