Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aj....115..274o&link_type=abstract
Astronomical Journal, vol. 115, p. 274
Astronomy and Astrophysics
Astronomy
34
Star Formation, Molecular Clouds, Pre-Main Sequence Stars, Cassiopeia Constellation, Carbon Monoxide, H Alpha Line, Point Sources, Infrared Astronomy Satellite
Scientific paper
Radio and optical observations have been made in order to examine star formation in the dark cloud L1333. A study of the cumulative distribution of field star distance moduli yields a distance value close to 180 pc for the L1333 molecular cloud. (C-13)O observations revealed two filamentary molecular clouds with distinct velocities of VLSR about -2 and 3 km/s, respectively. Thirteen (C-18) cores, characterized by an average molecular mass (MLTE) of 9 M and a mean density of 1.4 x 10 exp 4/cu cm, are embedded in the two (C-13)O clouds. We have detected 18 H-alpha emission-line stars projected within or near the (C-13)O clouds on objective-prism plates. They can be regarded as candidate premain-sequence stars formed in the clouds. Five IRAS sources with flux density distributions characteristic of young stellar objects (YSOs) are found in the area of the cloud. Three of the IRAS sources coincide with H emission-line stars, the others with faint stars without detected H-alpha emission. One of the latter sources is associated with a (C-18)O core and exhibits a protostar-type infrared spectrum. The IRAS source exhibits a winglike feature of 1.6 km/s in (C-18)O, which may indicate that the YSO has an outflow. We note that the (C-18)O core has the smallest ratio of virial mass to MLTE among the C18O cores in L1333, suggesting that star formation occurs preferentially in a core whose internal kinetic energy is low compared with the self-gravitational energy.
Fukui Yasuo
Kun Maria
Obayashi Ayano
Sato Fumio
Yonekura Yoshinori
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