Browsing by Subject "orion ultradeep project"
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Item New X-Ray-Selected Pre-Main-Sequence Members Of The Serpens Molecular Cloud(2013-11) Oliveira, Isa; van der Laan, Margriet; Brown, Joanna M.; Oliveira, IsaThe study of young stars no longer surrounded by disks can greatly add to our understanding of how protoplanetary disks evolve and planets form. We have used VLT/FLAMES optical spectroscopy to confirm the youth and membership of 19 new young diskless stars in the Serpens Molecular Cloud, identified at X-ray wavelengths. Spectral types, effective temperatures, and stellar luminosities were determined using optical spectra and optical/near-infrared photometry. Stellar masses and ages were derived based on pre-main-sequence evolutionary tracks. The results yield remarkable similarities for age and mass distribution between the diskless and disk-bearing stellar populations in Serpens. We discuss the important implications these similarities may have on the standard picture of disk evolution.