Young stellar objects & photoevaporating protoplanetary disks in the Orion's sibling NGC 1977

J. S. Kim, M. Fang, C. J. Clarke, S. Facchini, I. Pascucci, D. Apai, J. Bally

Research output: Contribution to journalConference articlepeer-review


We present young stellar population in NGC 1977, Orion Nebula's sibling, and the discovery of new photoevaporating protoplanetary disks (proplyds) around a B star, 42 Ori. NGC 1977 (age≲2 Myr) is located at ∼30' north of the Orion Nebula at a distance of ∼400 pc, but it lacks high mass O stars unlike in Orion Nebula Cluster (ONC). Nevertheless, we have identified seven proplyds in vicinity of its most massive star, 42 Ori (B1V). The proplyds show cometary Hα emission in HST images, with clear ionization front and tails evaporating away from 42 Ori. These are the first proplyds to be found around a B star, while previously known proplyds were found near O stars. The FUV radiation impinging on these proplyds is 10-30 times weaker than that on the proplyds in ONC. We find that observed proplyd sizes are consistent with a model for photoevaporation in weak FUV radiation field. We briefly discuss one of the interesting YSOs found in this lesser-known star forming region in Orion, NGC 1977.

Original languageEnglish (US)
Pages (from-to)790-792
Number of pages3
JournalMemorie della Societa Astronomica Italiana - Journal of the Italian Astronomical Society
Issue number4
StatePublished - 2017
Event2017 Conference Francesco's Legacy: Star Formation in Space and Time - Firenze, Italy
Duration: Jun 5 2017Jun 9 2017

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Radiology Nuclear Medicine and imaging
  • Astronomy and Astrophysics
  • Instrumentation
  • Atomic and Molecular Physics, and Optics


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