Medium-term Variability in Emission from the Orion Nebula

Details Medium-term Variability in Emission from the Orion Nebula Medium-term Variability in Emission from the Orion Nebula

Jun 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..390..106b&link_type=abstract

Pathways Through an Eclectic Universe ASP Conference Series, Vol. 390, proceedings of the conference held 23-27 April, 2007 at S

Astronomy and Astrophysics

Astronomy

Scientific paper

Measuring the surface brightness changes in HST images in Hα and [O III]5007 Å taken with a time interval of 6.84 yr, we show how to detect separately the changes due to density variations and those due to temperature variations. Following O'Dell et al., we used the brightness changes to show and measure proper motions in streams and fronts at up to 140 km s-1. The strongest density variations coincide with the proper motions, while in quiescent zones we can detect mean temperature variations of tens of degrees along the line of sight in the time interval between the observations.

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