English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We have performed a survey for new members of the Ophiuchus cloud complexusing high-precision astrometry from the second data release of Gaia, propermotions measured with multi-epoch images from the Spitzer Space Telescope, andcolor-magnitude diagrams constructed with photometry from various sources.Through spectroscopy of candidates selected with those data, we have identified155 new young stars. Based on available measurements of kinematics, we classify102, 47, and six of those stars as members of Ophiuchus, Upper Sco, and otherpopulations in Sco-Cen, respectively. We have also assessed the membership ofall other stars in the vicinity of Ophiuchus that have spectroscopic evidenceof youth from previous studies, arriving at a catalog of 373 adopted members ofthe cloud complex. For those adopted members, we have compiled mid-IRphotometry from Spitzer and the Wide-field Infrared Survey Explorer} and haveused mid-IR colors to identify and classify circumstellar disks. We find that210 of the members show evidence of disks, including 48 disks that are inadvanced stages of evolution. Finally, we have estimated the relative medianages of the populations near the Ophiuchus clouds and the surrounding Upper Scoassociation using absolute K-band magnitudes (M_K) based on Gaia} parallaxes.If we adopt an age 10 Myr for Upper Sco, then the relative values of M_K implymedian ages of ~2 Myr for L1689 and embedded stars in L1688, 3-4 Myr forlow-extinction stars near L1688, and ~6 Myr for the group containing rho Oph.

A Survey for New Stars and Brown Dwarfs in the Ophiuchus Star-forming Complex