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The reality of old moving groups - the case of HR 1614. Age, metallicity, and a new extended sample
We prove the existence of the old and metal-rich moving group HR 1614.This is done using the new Hipparcos parallaxes in combination withmetallicities derived from Strömgren photometry, supported bydynamical simulations of the evolution of old moving groups in thegalactic potential. A new selection criterion for this moving group ispresented as well as a new, extended sample of probable member stars. Inparticular we find that the HR 1614 moving group has an age of about 2Gyr (using Bertelli et al. 1994 isochrones) and a [Fe/H] =~ 0.19 +/-0.06 dex. We also revisit and apply our new selection criterion to thesamples in Eggen (1992) and Eggen (1998b). It is found that, whenbinaries and stars with too low metallicity have been removed, 15 of hisstars fulfill our criteria. Based on observations with the ESA Hipparcossatellite.
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Observation and Astrometry data
| Constellation: | Zwillinge |
| Right ascension: | 07h24m49.99s |
| Declination: | +14°38'42.6" |
| Apparent magnitude: | 9.775 |
| Proper motion RA: | -6.2 |
| Proper motion Dec: | -2.6 |
| B-T magnitude: | 10.269 |
| V-T magnitude: | 9.816 |
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