On the distance to the Ophiuchus star-forming region

  title={On the distance to the Ophiuchus star-forming region},
  author={Eric E. Mamajek},
  journal={Astronomische Nachrichten},
  • E. Mamajek
  • Published 4 September 2007
  • Chemistry
  • Astronomische Nachrichten
The Ophiuchus molecular cloud complex has produced in Lynds 1688 the richest known embedded cluster within ∼300 pc of the Sun. Unfortunately, distance estimates to the Oph complex vary by nearly ∼40% (∼120–165 pc). Here I calculate a new independent distance estimate of 135±8 pc to this benchmark star-forming region based on Hipparcos trigonometric parallaxes to stars illuminating reflection nebulosity in close proximity to Lynds 1688. Combining this value with recent distance estimates from… 

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