Henize 70 (N70) is a faint emission nebula and superbubble located in the Large Magellanic Cloud. It is located in the constellation of Dorado.
Observation history
Henize 70 was first observed in 1950 in a survey of bright planetary nebulae, based on appearance it was proposed that it might be a supernova remnant. In 1956, it was added to a catalogue of Hα emission stars and nebulae by Karl Gordon Henize, where it was described as an emission nebula instead of a planetary nebula.
Origins
In a paper published in 1978, it was proposed that stellar winds could be a major part of the formation of Henize 70 and other emission nebulae. Later, in a scientific article 1981 it was mentioned that it was more likely from a supernova explosion rather than stellar winds. Another study in 2014 measured high SII and Hα ratios, indicating that it is not a supernova remnant.
Henize 70 has spectral line ratios relatively similar to that of supernova remnants due to having similar SII/Hα line ratios although most supernova remnants have higher NII/Hα line ratios.