NEW X-RAY-SELECTED PRE-MAIN-SEQUENCE MEMBERS OF THE SERPENS MOLECULAR CLOUD

作者：Oliveira Isa^*; van der Laan Margriet; Brown Joanna M

来源：Astronomical Journal, 2013, 146(5): 105.

DOI：10.1088/0004-6256/146/5/105

• circumstellar matter
• Hertzsprung-Russell and C-M diagrams
• ISM: individual objects (Serpens)
• stars: pre-main-sequence

The 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.

• 出版日期2013-11