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HD 156240


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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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Osservazione e dati astrometrici

Costellazione:Altare
Ascensione retta:17h19m28.85s
Declinazione:-54°21'49.2"
Magnitudine apparente:8.868
Distanza:129.199 parsec
Moto proprio RA:-12.9
Moto proprio Dec:-60.5
B-T magnitude:9.176
V-T magnitude:8.894

Cataloghi e designazioni:
Nomi esatti   (Edit)
HD 1989HD 156240
TYCHO-2 2000TYC 8727-654-1
USNO-A2.0USNO-A2 0300-31241795
HIPHIP 84755

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