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HD 30879


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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.

Two-colour photometry for 9473 components of close Hipparcos double and multiple stars
Using observations obtained with the Tycho instrument of the ESAHipparcos satellite, a two-colour photometry is produced for componentsof more than 7 000 Hipparcos double and multiple stars with angularseparations 0.1 to 2.5 arcsec. We publish 9473 components of 5173systems with separations above 0.3 arcsec. The majority of them did nothave Tycho photometry in the Hipparcos catalogue. The magnitudes arederived in the Tycho B_T and V_T passbands, similar to the Johnsonpassbands. Photometrically resolved components of the binaries withstatistically significant trigonometric parallaxes can be put on an HRdiagram, the majority of them for the first time. Based on observationsmade with the ESA Hipparcos satellite.

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Gözlemler ve gökölçümü verileri

Takýmyýldýz:Ressam
Sað Açýklýk:04h48m30.41s
Yükselim:-52°37'44.0"
Görünürdeki Parlaklýk:9.215
Uzaklýk:97.276 parsek
özdevim Sað Açýklýk:56.1
özdevim Yükselim:185.2
B-T magnitude:9.941
V-T magnitude:9.275

Kataloglar ve belirtme:
Özgün isimleri   (Edit)
HD 1989HD 30879
TYCHO-2 2000TYC 8510-357-1
USNO-A2.0USNO-A2 0300-01461010
HIPHIP 22322

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