Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apjs...88..119h&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 88, no. 1, p. 119-135.
Astronomy and Astrophysics
Astrophysics
52
Astronomical Polarimetry, Molecular Clouds, Star Clusters, Star Formation, Extremely High Frequencies, Infrared Imagery, Infrared Spectroscopy, Open Clusters, Star Distribution, Stellar Luminosity, Stellar Magnetic Fields
Scientific paper
We are presenting K-prime-band images of two regions in the L1641 cloud, one of them containing the region of the L1641 North molecular outflow. We detect a clear overabundance of relatively bright stars near the outflow region, with a peak between M(K-prime) values of 1.5 and 2.0. Polarimetry in I and K-prime is used to identify sources of localized reflection nebulosity and to map the magnetic field projected on the sky. The magnetic field is not aligned with the axis of the dominant molecular outflow, but apparently has led to the formation of features in the gas and dust flattened orthogonally to the direction of the magnetic field. K-band spectroscopy was obtained for a K-prime-magnitude-limited sample of stars down to K-prime = 13.1 near the L1641 North outflow source. Stars with classifiable spectra were placed in an H-R diagram, indicating a median age of about 3 x 10 exp 5 yr for the stars forming in this young cluster. Comparison of the brightness histogram with theoretical models indicates a median age of about 5 x 10 exp 5 yr. This supports a scenario of ongoing successive formation of individual stars in this molecular cloud over a time span of 1 x 10 exp 6 yr.
Deane James
Hodapp Klaus-Werner
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