Lynds 1622: A nearby star-forming cloud projected on Orion B?

M. Kun, Z. Balog, N. Mizuno, A. Kawamura, A. Gáspár, S. J. Kenyon, Y. Fukui

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


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 L 1622 from the molecular observations. Our results are not compatible with the assumption that L 1622 lies on the near side of the Orion-Eridanus loop, but suggest that L 1622 is as distant as Orion B. At a distance of 400 pc the mass of the cloud, derived from our 12CO data, is 1100 M, its star formation efficiency is ∼1.8 per cent, and the average age of its low-mass pre-main-sequence star population is about 1 Myr.

Original languageEnglish (US)
Pages (from-to)84-94
Number of pages11
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
StatePublished - Nov 2008
Externally publishedYes


  • ISM: clouds
  • ISM: individual: L 1622
  • Stars: formation
  • Stars: pre-main-sequence

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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