Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pasj...53.1081t&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.53, No. 6, pp. 1081-1096
Astronomy and Astrophysics
Astronomy
33
Ism: Clouds, Ism: Kinematics And Dynamics, Ism: Molecules, Ism: Structure, Stars: Formation
Scientific paper
The Lupus star-forming region has been surveyed for molecular clouds in 12CO with the NANTEN radio telescope, and a cloud mass of 1.7 × 104 Msolar has been revealed. We were able to detect 105 molecular clouds, most of which are relatively small and of low mass. The members of the Sco OB 2 association and the X-ray detected pre--main-sequence stars (PMSs) are distributed all around this region. The OB stars and the molecular clouds show exclusive distributions. Large fractions of the PMSs are located away from the molecular clouds, and are thus isolated. The origin of the isolated PMSs is discussed. About 40% of the PMSs have candidates of their parent clouds less massive than 20 Msolar within 4 pc, which suggests in-situ star formation in the small clouds and their rapid dissipation. The separations from the PMSs to the clouds are typically larger than those in the Chamaeleon region, probably because of coexisting OB stars. From the cloud structures and the distributions of the OB stars, PMSs, and HI expanding shell, it is suggested that the molecular clouds have been effectively dissipated by the OB stars and a shock wave, which may also have triggered star formation in Lupus and the ρ Oph clouds.
Fukui Yasuo
Mizuno Akira
Neuhäuser Ralph
Onishi Toshikazu
Tachihara Kengo
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