YSOs search in LDN 1340 in optical

DOI

We have performed an optical spectroscopic and photometric search for young stellar objects associated with the molecular cloud Lynds 1340, and examined the structure of the cloud by constructing an extinction map, based on SDSS data. The new extinction map suggests a shallow, strongly fragmented cloud, having a mass of some 3700M_{sun}. Longslit spectroscopic observations of the brightest stars over the area of L1340 revealed that the most massive star associated with L1340 is a B4-type, ~5M{sun} star. The new spectroscopic and photometric data of the intermediate-mass members led to a revised distance of 825-80_^+110^pc, and revealed seven members of the young stellar population with M>~2M_{sun}. Our search for H{alpha} emission line stars, conducted with the Wide Field Grism Spectrograph 2 on the 2.2m telescope of the University of Hawaii and covering a 30'x40' area, resulted in the detection of 75 candidate low-mass pre-main sequence stars, 58 of which are new. We constructed spectral energy distributions (SEDs) of our target stars, based on SDSS, 2MASS, Spitzer, and WISE photometric data, derived their spectral types, extinctions, and luminosities from BVRIJ fluxes, estimated masses by means of pre-main sequence evolutionary models, and examined the disk properties utilizing the 2-24{mu}m interval of the SED. We measured the equivalent width of the H{alpha} lines and derived accretion rates. The optically selected sample of pre-main sequence stars has a median effective temperature of 3970K, a stellar mass of 0.7M{sun}, and an accretion rate of 7.6x10^-9^M{sun}_/yr.

Cone search capability for table J/ApJ/822/79/table1 (Log of spectroscopic observations of 23 young star candidates)

Cone search capability for table J/ApJ/822/79/emstars (Properties of the H{alpha} emission stars derived from the photometric and EW(H{alpha}) data (tables 2 and 6))

Identifier
DOI http://doi.org/10.26093/cds/vizier.18220079
Source https://dc.g-vo.org/rr/q/lp/custom/CDS.VizieR/J/ApJ/822/79
Related Identifier https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/822/79
Related Identifier https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/822/79
Metadata Access http://dc.g-vo.org/rr/q/pmh/pubreg.xml?verb=GetRecord&metadataPrefix=oai_b2find&identifier=ivo://CDS.VizieR/J/ApJ/822/79
Provenance
Creator Kun M.; Moor A.; Szegedi-Elek E.; Reipurth B.
Publisher CDS
Publication Year 2016
Rights https://cds.unistra.fr/vizier-org/licences_vizier.html
OpenAccess true
Contact CDS support team <cds-question(at)unistra.fr>
Representation
Resource Type Dataset; AstroObjects
Discipline Astrophysics and Astronomy; Interdisciplinary Astronomy; Interstellar medium; Natural Sciences; Observational Astronomy; Physics; Stellar Astronomy