Search for associations containing young stars (SACY). I. Sample and searching method

  title={Search for associations containing young stars (SACY). I. Sample and searching method},
  author={Carlos A. O. Torres and Germano R. Quast and L. Pinheiro da Silva and Ramiro de la Reza and Claudio Melo and Michael F. Sterzik},
  journal={Astronomy and Astrophysics},
We report results from a high-resolution optical spectroscopic survey aimed to search for nearby young associations and young stars among optical counterparts of ROSAT All-Sky Survey X-ray sources in the Southern Hemisphere. We selected 1953 late-type ($B-V~\geq~0.6$), potentially young, optical counterparts out of a total of 9574 1RXS sources for follow-up observations. At least one high-resolution spectrum was obtained for each of 1511 targets. This paper is the first in a series presenting… 

Search for associations containing young stars (SACY) - III. Ages and Li abundances

Context. Our study is a follow-up of the SACY project, an extended high spectral resolution survey of more than two thousand optical counterparts of X-ray sources in the Southern Hemisphere targeted

Search for associations containing young stars (SACY)

Context. Nearby young associations offer one of the best opportunities for a detailed study of the properties of young stellar and substellar objects thanks to their proximity (<200 pc) and age

The Li Abundance and the Age of AB Dor Association

In a recent paper (Torres et al. 2006) we report the results from a highresolution optical spectroscopic survey searching for associations containing young stars (SACY), among optical counterparts of

Search for associations containing young stars (SACY). VII. New stellar and substellar candidate members in the young associations

Context. The young associations offer us one of the best opportunities to study the properties of young stellar and substellar objects and to directly image planets thanks to their proximity (<200

A Spectroscopic Survey of the Youngest Field Stars in the Solar Neighborhood. II. The optically faint sample

Star formation in the solar neighborhood is mainly traced by young stars in open clusters, associations and in the field, which can be identified by their X-ray emission. The determination of stellar

Search for associations containing young stars (SACY) - V. Is multiplicity universal? Tight multiple systems

Context. Dynamically undisrupted, young populations of stars are crucial in studying the role of multiplicity in relation to star formation. Loose nearby associations provide us with a great sample


We describe a new method to identify young, late-type stars within ∼150 pc of the Earth that employs visual or near-infrared (NIR) data and the GALEX GR4/5 database. For spectral types later than K5,

Lithium abundances in southern associations containing young stars

In a recent paper, da Silva et al. (2009), we report results of Li abundance analysis for nine young stellar associations, defined in Torres et al. (2008), from a high-resolution optical

Search for associations containing young stars (SACY) - II. Chemical abundances of stars in 11 young associations in the solar neighborhood

The recently discovered coeval, moving groups of young stellar objects in the solar neighborhood represent invaluable laboratories for studying recent star formation and searching for high


The census of young moving groups in the solar neighborhood is significantly incomplete in the low-mass regime. We have developed a new selection process to find these missing members based on the



Nearby young stars

We present the results of an extensive all-sky survey of nearby stars of spectral type F8 or later in a systematic search of young (zero-age main sequence) objects. Our sample has been derived by

Li abundance in young PMS associations: AB Dor

We present stellar parameters, Li abundances for 21 stars of the young ($\sim$50 Myears) AB Dor association, based on high-resolution spectra obtained with FEROS at the ESO 1.52m telescope, the Coudé

A Candidate Substellar Companion to HR 7329

We present the discovery of a candidate substellar companion from a survey of nearby young stars made with the Near-Infrared Camera and Multiobject Spectrometer coronagraph on the Hubble Space

A New Association of Post-T Tauri Stars near the Sun

Observing ROSAT sources in an area 20° × 25° centered at the high-latitude (b = -59°) active star ER Eri, we found evidences for a nearby association, that we call the Horologium association (HorA),

The short period multiplicity among T Tauri stars

We present the results of high-resolution spectroscopic observations carried out over three years aimed at estimating the short-period (Porb < 100 days) binary frequency of a sample of T Tauri stars

The Palomar/MSU Nearby Star Spectroscopic Survey. III. Chromospheric Activity, M Dwarf Ages, and the Local Star Formation History

We present high-resolution echelle spectroscopy of 676 nearby M dwarfs. Our measurements include radial velocities, equivalent widths of important chromospheric emission lines, and rotational

The late A-type stars - Refined MK classification, confrontation with Stromgren photometry, and the effects of rotation

The MK spectral classification for late A-type stars is refined and the effects of rotation of spectral classification and uvby(beta) photometry for these stars are examined. It is found that, for A3

The ϵ Chamaeleontis Young Stellar Group and the Characterization of Sparse Stellar Clusters

We present the outcomes of a Chandra X-Ray Observatory snapshot study of five nearby Herbig Ae/Be (HAeBe) stars that are kinematically linked with the Oph-Sco-Cen association (OSCA). Optical

Discovery of Seven T Tauri Stars and a Brown Dwarf Candidatein the Nearby TW Hydrae Association

We report the discovery of five T Tauri star systems, two of which are resolved binaries, in the vicinity of the nearest known region of recent star formation: the TW Hydrae Association. The newly

Rotational Velocities and Chromospheric/Coronal Activity of Low-Mass Stars in the Young Open Clusters IC 2391 and IC 2602

We have obtained high-resolution, moderate signal-to-noise ratio spectra for approximately 80 candidate low-mass members of the nearby, very young open clusters IC 2391 and IC 2602. Most of the stars