SACY (Search for Associations Containing Young Stars) Catalog

SACY (Search for Associations Containing Young Stars) Catalog SACY ivo://nasa.heasarc/sacy NASA/GSFC HEASARC Torres et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source The SACY (Search for Associations Containing Young Stars) Catalog contains the 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. 1953 late-type (B-V>=0.6), potentially young, optical counterparts were selected 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 the results of the SACY survey in which the sample of X-ray selected stars and the supporting optical observations are described. The SACY sample is defined by Hipparcos (<a href="https://cdsarc.cds.unistra.fr/ftp/cats/I/239">CDS Cat. <I/239></a>) and Tycho-2 (<a href="https://cdsarc.cds.unistra.fr/ftp/cats/I/259">CDS Cat. <I/259></a>) stars within an error radius of 2.6 times the positional error of the ROSAT All-Sky Bright Source Catalogue (1RXS, <a href="https://cdsarc.cds.unistra.fr/ftp/cats/IX/10">CDS Cat. <IX/10></a>). The used cut-off (B-V=0.6), corresponding approximately to a G0 dwarf, is near the hottest stars where the strength of the LiI line can be used as an youth indicator. All Hipparcos stars having M_v < 2.0 have been excluded. The northern boundary limits of the survey are given in Table 1 of the reference paper. In addition to the 1511 stars observed at least once, 115 stars with data taken from the literature have been added in order to complement the sample. In addition to these 1626 stars in the SACY sample (sources with source number prefixes of 'S'), entries for 165 other observed stars (sources with source number prefixes of 'O') are also included in this table. Most of the spectroscopic observations (~70%) were performed with the FEROS spectrograph at the 1.5m/ESO telescope at La Silla between January 1999 and September 2002 (ON-ESO agreement and ESO program identification 67.C-0123). Two more runs (ESO program identifications 072.C-0393 and 077.C-0138) were carried out at the 2.2m/ESO telescope. Another set of data (~30%) was collected at the coude spectrograph attached to 1.60m telescope at the Observatorio rio do Pico dos Dias (OPD), LNA, Brazil. Some spectra are a re-analysis of the ones taken for the PDS program. A few observations were collected using the CORALIE attached to the Swiss Euler Telescope at La Silla. UBV(RI)c photometry for part of the sample was obtained using FOTRAP at the 0.60m Zeiss telescope of the OPD. When a star was not observed photometrically by the authors, they tried to obtain some useful photometric data from the Hipparcos and Tycho Catalogues or in the available literature in the SIMBAD. For multiple stars, magnitudes and colors were corrected in order to take into account the presence of the companion(s). This table was created by the HEASARC in March 2007 based on the CDS table J/A+A/460/695, files table3.dat and table4.dat This is a service provided by NASA HEASARC . 2006A&A...460..695T https://heasarc.gsfc.nasa.gov/W3Browse/all/sacy.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=sacy& GET text/xml 180 99999 true 69.12916667 -87.4675 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=sacy GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_sacy&Action=More+Options&Action=Parameter+Search&ConeAdd=1 STAR CATALOG 0.0166666666666667 Optical X-ray public sacy SACY (Search for Associations Containing Young Stars) Catalog xray_name 1RXS (<IX/10>,<IX/29>) Source Designation char nullable name Hipparcos (<I/239>), Tycho-2 (<II/259>) or UCAC2 (<I/289>) Identification meta.id;meta.main char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable spect_type MK Spectral Type src.spType char nullable vmag Johnson V Magnitude mag phot.mag;em.opt.V double nullable bv_color Johnson B-V Color Index mag phot.color;em.opt.B;em.opt.V double nullable "__x_ra_dec" System unit vector column double nullable "__y_ra_dec" System unit vector column double nullable "__z_ra_dec" System unit vector column double nullable "__row" System index column char nullable pm_ra Proper Motion in Right Ascension (mas/yr) mas/yr pos.pm;pos.eq.ra double nullable multiplicity_flag Flag [D,SB1234 ?] Indicates Multiplicity char nullable vb_delta_mag Magnitude Difference of Components mag double nullable source_number Sequential Number for Each Source Prefixed with S for Table 3 and O for Table 4 meta.id;src char nullable halpha_equiv_width H-alpha Line Emission (Angstroms) Angstrom double nullable variability_flag Flag [V] Indicates Variability meta.code;src.var char nullable li_i_equiv_width_flag Flag [:?] Indicates Quality of Li-I Equivalent Width char nullable radial_velocity_flag Flag [L] Indicates Heliocentric Radial Velocity Value Originates from Literature char nullable photometry_flag Flag [C] Indicates Photometry Corrected for Companions char nullable vi_color Cousins V-I Color Index mag double nullable ref_photometry Reference Code for Source of Photometry char nullable bii Galactic Latitude degree pos.galactic.lat double nullable vb_delta_mag_flag Flag [?] Indicates Uncertainty in Magnitude Difference of Components char nullable ref_vrot_sini Reference Code for Source of Rotational Velocity char nullable alt_name Alternative Source Identification (HD, DM, or Other) meta.id char nullable lii Galactic Longitude degree pos.galactic.lon double nullable radial_velocity Heliocentric Radial Velocity km/s spect.dopplerVeloc double nullable parallax Trigonometric Parallax (mas) mas double nullable ref_spectroscopy Reference Code for Source of Spectral Information char nullable ref_parallax Reference Code for Source of Trigonometric Parallax char nullable li_i_equiv_width Li-I Equivalent Width (milli-Angstroms) 0.1_pm short nullable vrot_sini_error RMS Uncertainty on Rotational Velocity km/s double nullable radial_velocity_num_obs Number of Observations Used to Determine the Heliocentric Radial Velocity short nullable ref_pm Reference Code for Source of Proper Motions char nullable vb_angular_separation Angular Separation of Visual Binaries (arcsec) arcsec double nullable pm_dec Proper Motion in Declination (mas/yr) mas/yr pos.pm;pos.eq.dec double nullable parallax_error Standard Error in Trigonometric Parallax (mas) mas double nullable ref_radial_velocity Reference Code for Source of Heliocentric Radial Velocity char nullable class Browse Object Classification src.class short nullable vrot_sini Rotational Velocity (km/s) km/s double nullable radial_velocity_qual Flag [:] Indicates Quality of Heliocentric Radial Velocity char nullable radial_velocity_error RMS of the Observed Heliocentric Radial Velocity (km/s) km/s stat.error;spect.dopplerVeloc double nullable