New Young Stars and Brown Dwarfs in the Upper Scorpius Association
AffiliationUniv Arizona, Steward Observ
stars: luminosity function, mass function
stars: pre-main sequence
MetadataShow full item record
PublisherIOP PUBLISHING LTD
CitationK. L. Luhman et al 2018 AJ 156 76
Rights© 2018. The American Astronomical Society. All rights reserved.
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AbstractTo improve the census of the Upper Sco association (similar to 11 Myr, similar to 145 pc), we have identified candidate members using parallaxes, proper motions, and color-magnitude diagrams from several wide-field imaging surveys and have obtained optical and infrared spectra of several hundred candidates to measure their spectral types and assess their membership. We also have performed spectroscopy on a smaller sample of previously known or suspected members to refine their spectral types and evidence of membership. We have classified 530 targets as members of Upper Sco, 377 of which lack previous spectroscopy. Our new compilation of all known members of the association contains 1631 objects. Although the census of Upper Sco has expanded significantly over the last decade, there remain hundreds of candidates that lack spectroscopy. The precise parallaxes and proper motions from the second data release of Gaia should extend down to substellar masses in Upper Sco, which will greatly facilitate the identification of the undiscovered members.
VersionFinal published version
SponsorsNSF [AST-1208239, AST-1238877]; NASA [80NSSC18K0444, NNH14CK55B]; NASA NExSS program; National Optical Astronomy Observatory (NOAO) [2011A-0415, 2013A-0224, 2014A-0180, 2015A-0192, 2017A-0161]; SCIENCE; HCM plans of the European Commission [CT920791, CT940627]; INSU in France; MEN in France; CNRS in France; State of Baden-Wurttemberg in Germany; DGICYT in Spain; CNR in Italy; FFwFBWF in Austria; FAPESP in Brazil; OTKA in Hungary [F-4239, F-013990]; ESO CEE [A-04-046]; National Aeronautics and Space Administration through the Planetary Science Division of the NASA Science Mission Directorate [NNX08AR22G]; Pennsylvania State University; Eberly College of Science; Pennsylvania Space Grant Consortium; [GS-2009A-C-7 (NOAO 2009A-0083)]; [GN-2017A-FT-12]; [GN-2017A-FT-17]