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HD 4021


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Search for associations containing young stars (SACY). I. Sample and searching method
We report results from a high-resolution optical spectroscopic surveyaimed to search for nearby young associations and young stars amongoptical counterparts of ROSAT All-Sky Survey X-ray sources in theSouthern Hemisphere. We selected 1953 late-type (B-V~≥~0.6),potentially young, optical counterparts out of a total of 9574 1RXSsources for follow-up observations. At least one high-resolutionspectrum was obtained for each of 1511 targets. This paper is the firstin a series presenting the results of the SACY survey. Here we describeour sample and our observations. We describe a convergence method in the(UVW) velocity space to find associations. As an example, we discuss thevalidity of this method in the framework of the β Pic Association.

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Observation and Astrometry data

Constellation:くじら座
Right ascension:00h42m36.05s
Declination:-16°42'11.6"
Apparent magnitude:8.85
Distance:54.975 parsecs
Proper motion RA:-6.6
Proper motion Dec:20.9
B-T magnitude:9.72
V-T magnitude:8.922

Catalogs and designations:
Proper Names
HD 1989HD 4021
TYCHO-2 2000TYC 5847-1041-1
USNO-A2.0USNO-A2 0675-00274126
HIPHIP 3342

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