Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-09-27
Astronomy and Astrophysics
Astrophysics
13 pages, 9 figures, 4 tables; accepted by MNRAS
Scientific paper
10.1111/j.1365-2966.2008.13898.x
We present results of optical spectroscopic and photometric observation of the pre-main sequence stars associated with the cometary shaped dark cloud Lynds 1622, and 12CO and 13CO observations of the cloud. We determined the effective temperatures and luminosities of 14 pre-main sequence stars associated with the cloud from their positions in the Hertzsprung--Russell diagram, as well as constructed their spectral energy distributions using optical, 2MASS and Spitzer IRAC and MIPS data. We derived physical parameters of L1622 from the molecular observations. Our results are not compatible with the assumption that L1622 lies on the near side of the Orion-Eridanus loop, but suggest that L1622 is as distant as Orion B. At a distance of 400 pc the mass of the cloud, derived from our CO data, is 1100 solar masses, its star formation efficiency is 1.8%, and the average age of its low-mass pre-main sequence star population is about 1 million years.
Balog Zoltan
Fukui Yasuo
Gaspar Andras
Kawamura Akiko
Kenyon Scott. J.
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