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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.
| UVBY photometry of HIPPARCOS stars
Photoelectric data in the uvby system have been obtained for 367southern stars of the Hipparcos Input Catalogue. Most of the stars are Fand G main sequence and fall in the magnitude range V = 9 to 10.
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| Сазвежђа: | Олтар |
| Ректацензија: | 17h19m28.85s |
| Deклинација: | -54°21'49.2" |
| Apparent магнитуда: | 8.868 |
| Даљина: | 129.199 parsecs |
| Proper motion RA: | -12.9 |
| Proper motion Dec: | -60.5 |
| B-T magnitude: | 9.176 |
| V-T magnitude: | 8.894 |
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