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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We obtained JHK images and low-resolution JH spectra in the embedded youngcluster in the Serpens cloud Main core (also known as Serpens North). Wedetermined spectral types for 15 previously identified cluster members (for 5of them for the first time), 1 new candidate, and 11 stars that appear to befield interlopers. Extinction, for which we derived an analytical expression,was obtained by taking SpT and near-IR excess into account. The location on theHertzsprung-Russell diagram indicates that we probed a low-mass population ofthe cloud (0.05 - 1.5 Msol), including 1 - 3 brown dwarfs. We used ourindividually determined photospheric parameters to analyze the ISO and theSpitzer determined spectral energy distribution classes. The latter werecorrelated with the age and location of the sources in the cloud. We find thatmost flat objects from our study (4 out of 5) have SEDs consistent withreddened classical T Tau stars; however, when comparing to the thick disk SEDsof lower mass M-type objects, we find that the flat ones show more excess,perhaps indicating an earlier evolutionary stage. We determined a median agefor the cluster to be 1 Myr for distance of 380 pc, and 3 Myr for a less likelydistance of 260 pc. The core of the cluster is on average younger than the restof the cluster. We do not find objects with disks past 5 Myr. We do finddiskless, X-ray bright objects younger than 1 Myr, as was also noted in thestudy of Winston et al (2009). We find two groups of young objects associatedwith dark filaments, indicating that star formation was not always confined tothe core.

FLAMINGOS Near Infra-Red Survey of The Serpens Cloud Main Core