Candidate low-mass PMS in 25 Orionis group : J/AJ/131/2959

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Authors : McGehee P.M. orcid (hide) et..al

VizieR DOI : 10.26093/cds/vizier.51312959
Bibcode : 2006AJ....131.2959M (ADS) (Simbad) (Objects)
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CDS Keywords : Associations, stellar; Stars, pre-main sequence; Stars, late-type; Photometry, SDSS
UAT : Stellar associations, Pre-main sequence stars, Late-type stars, Optical astronomy, Sloan photometry

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Inserted into VizieR : 13-Oct-2008
Last modification : 18-Nov-2008

The southern flanking fields of the 25 Orionis group. (2006)

Keywords : open clusters and associations individual (25 Orionis) - stars: formation - stars: late-type - stars: low-mass, brown dwarfs - stars: pre-main sequence

Abstract:The stellar group surrounding the Be (B1Vpe) star 25 Ori was discovered to be a pre-main-sequence (PMS) population by the CIDA Variability Survey of Orion (Cat. J/AJ/129/907) and subsequent spectroscopy. We analyze Sloan Digital Sky Survey multiepoch photometry to map the southern extent of the 25 Ori group and characterize its PMS population. We compare this group to the neighboring Orion OB1a and OB1b subassociations and to active star formation sites (NGC 2068/NGC 2071) within the LDN 1630 dark cloud. We find that the 25 Ori group has a radius of 1.4{deg}, corresponding to 8-11pc at the distances of Orion OB1a and OB1b. ...(more)
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