A Method to Search for Associations of Young Stars

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dc.creatorQuast, Germano R.
dc.creatorTorres, Carlos A. O.
dc.creatorMelo, Claudio H. F.
dc.creatorSterzik, Michael
dc.creatorde la Reza, Ramiro
dc.creatorda Silva, Licio
dc.date2003-06-12
dc.date.accessioned2026-07-07T02:08:46Z
dc.date.available2026-07-07T02:08:46Z
dc.descriptionIn the SACY (Search for Associations Containing Young-stars) project we try to identify associations of stars younger than the Local Association among HIPPARCOS and/or TYCHO-2 stars later than G0 which are counterparts of the ROSAT X-ray bright sources. High-resolution spectra for the possible optical counterparts were obtained in order to assess both the youth and the spatial motion of each target. More than 1000 ROSAT sources were observed, covering a large area in the Southern Hemisphere. Associations are characterized mainly by the similarity in UVW velocity space of their proposed member, but other parameters, as evolutionary age, Li abundance and distribution in space must also be taken into account. We proposed a method to identify associations when proper motions and radial velocities are available, but no parallaxes. Using the method we found eleven associations in the SACY data.
dc.description19 pages, 33 figures, to appear in the Proceedings of Open Issues in Local Formation and Early Stellar Evolution, Ouro Preto, Brazil
dc.identifierhttps://arxiv.org/abs/astro-ph/0306266
dc.identifierhttp://arxiv.org/abs/astro-ph/0306266
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/6185
dc.subjectAstrophysics
dc.titleA Method to Search for Associations of Young Stars
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