Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...292..249k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 292, no. 1, p. 249-260
Astronomy and Astrophysics
Astronomy
15
Emission Spectra, H Alpha Line, Infrared Astronomy, Interstellar Matter, Molecular Clouds, Pre-Main Sequence Stars, Radio Astronomy, Radio Spectra, Star Distribution, Star Formation, Visible Spectrum, Astronomical Spectroscopy, Density Distribution, Infrared Astronomy Satellite, Point Sources, Stellar Cores, Stellar Magnitude, Stellar Mass
Scientific paper
We report results of radio, optical and IRAS observations aimed at revealing some basic properties of the dark cloud Lynds 1340 (alpha1950 = 2 hr 26 min .0, delta1950 = + 72 deg 44 min). 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 600 pc for L 1340. (13)CO and C(18)O observations reveal three dense cores within the cloud having masses of 280, 470 and 180 solar mass, respectively. Young stellar object candidates, namely IRAS point sources, H-alpha emission stars and stars illuminating reflection nebulae are found to be associated with the cores. We detected 13 H-alpha emission stars within the area of the cloud on objective prism plates. 22 IRAS point sources with flux density distribution characteristic of young stellar objects are found in the cloud area. 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 H-alpha emission stars. Nine IRAS point sources have infrared colours characteristic of deeply embedded protostellar objects.
Ábrahám Peter
Balazs Lajos G.
Fukui Yasuo
Kelemen János
Kun Maria
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