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HD 37624


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A sample of solar-type stars of known age
A sample of field F and G dwarfs of known ages is presented. All thedwarfs are secondaries of visual binaries in which the temperature andgravity of the hotter primary has been estimated from Stromgrenphotometry, and its age derived from reference to isochrones. This ageis taken to apply to the secondary. Even in the case of F-typesecondaries, which themselves have measured Stromgren indices, it ismuch better to estimate ages from the primaries as it is demonstratedthat use of isochrones to determine age of stars not far evolved fromthe main sequence can lead to significant systematic overestimates ofages when the photometric measurements have typical random errors. Anumber of systems in which photometry is available for both componentshave primaries which appear much younger than the secondaries,suggesting a need for further investigation.

UVBY photometry of wide visual double stars with B, A and F spectral type- I.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1978A&AS...34..453O&db_key=AST

Catalog of multiple Trapezium type systems
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Observation and Astrometry data

Constellation:Lièvre
Right ascension:05h39m08.07s
Declination:-17°49'52.6"
Apparent magnitude:8.21
Distance:125.786 parsecs
Proper motion RA:-59.8
Proper motion Dec:30.6
B-T magnitude:8.72
V-T magnitude:8.253

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 37624
TYCHO-2 2000TYC 5921-932-1
USNO-A2.0USNO-A2 0675-02220158
HIPHIP 26591

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