changing ratio value (IMAGE)

The University of Hong Kong

changing ratio value

Caption

Simple plot showing the changing ratio value of [OIII] over the Hydrogen Hβ emission lines in IC418 over a 130-year time period. The most reliable data based on IC418 emission measured across the entire PN are plotted as filled triangles. Open triangles refer to less reliable measurements usually derived from wide slits or apertures that do not cover all of the nebula. Open squares show limits. The best fit and limits are shown that excludes data from narrow slits. 

Credit

Image adapted from respective journal paper

Usage Restrictions

N/A

License

Original content

Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.