Henize 70
H II region in the Large Magellanic Cloud
From Wikipedia, the free encyclopedia
Henize 70 (N70) is a faint[7] emission nebula[8] and superbubble[5] located in the Large Magellanic Cloud in the constellation of Dorado.
| Emission nebula | |
|---|---|
| Superbubble | |
Amateur photograph of Henize 70 | |
| Observation data: J2000 epoch | |
| Right ascension | 05h 43m 17.5s[1] |
| Declination | −67° 50′ 48″[1] |
| Distance | ~50,000[2] pc |
| Apparent dimensions (V) | 7′ × 8′[3] |
| Constellation | Dorado |
| Physical characteristics | |
| Dimensions | 346 × 396 ly[4][a] |
| Notable features | Superbubble |
| Designations | Henize 70,[5] N70,[3] LHA 120-N 70,[3][6] DEM L 301, MCELS L-373[6] |
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.[7] 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 rather than a planetary nebula.[8]
Origins
A paper published in 1978 proposed that the formations of Henize 70 and other emission nebulae could be due to stellar winds.[9] Later in 1981, a scientific article mentioned a higher likeliness of a supernova explosion forming the nebula instead of stellar winds.[10] A 2014 study measured that Henize 70 featured high SII and Hα ratios, indicating that it is not a supernova remnant.[11]
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.[12]
Notes
- Using angular dimensions of 7’ × 8’ and a distance of ~170 kly.
