SIMBAD references

We report results of radio, optical and IRAS observations aimed at revealing some basic properties of the dark cloud Lynds 1340 (α₁₉₅₀=2h26.0min, δ₁₉₅₀=+72deg44'). Study of the cumulative distribution of field star distance moduli and photometry of stars embedded in reflection nebulae within the cloud yield distance values close to 600pc for L1340. ¹³CO and C¹⁸O observations reveal three dense cores within the cloud having masses of 280, 470 and 180M_☉, respectively. Young stellar object candidates, namely IRAS point sources, Hα emission stars and stars illuminating reflection nebulae are found to be associated with the cores. We detected 13 Hα emission stars within the area of the cloud on objective prism plates. They can be regarded as candidate pre-main sequence stars born in the cloud. 22 IRAS point sources with flux density distribution characteristic of young stellar objects are found in the cloud area. Seven of them can be associated with Hα emission stars. We give objective prism spectral types and photoelectric UBV magnitudes for the stars illuminating reflection nebulosities within the cloud. The young stellar population associated with the cloud apparently contains four B and A type stars illuminating reflection nebulae and 17 low and intermediate mass pre-main sequence star candidates appearing as IRAS point sources and Hα emission stars. Nine IRAS point sources have infrared colours characteristic of deeply embedded protostellar objects. The surface distribution of the young stellar object candidates closely correlates with the three cores of the cloud.