AB7, also known as SMC WR7, is a binary star in the Small Magellanic Cloud. A Wolf–Rayet star and a supergiant companion of spectral type O orbit in a period of 19.56 days. The system is surrounded by a ring-shaped nebula known as a bubble nebula.
Wikidata facts
Show 7 more facts
- right ascension
- 15.89968088017220
- declination
- -72.05614455390430
- apparent magnitude
- 13.42
- spectral class
- WN4+O6I(f)
- catalog code
- Gaia DR2 4690512760120403840
- right ascension component of proper motion
- 0.925
- declination component of proper motion
- -1.189
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Article
9 sectionsContents
- Discovery
- Nebula
- The stars
- Spectrum
- Orbit
- Properties
- Evolution
- See also
- References
AB7, also known as SMC WR7, is a binary star in the Small Magellanic Cloud. A Wolf–Rayet star and a supergiant companion of spectral type O orbit in a period of 19.56 days. The system is surrounded by a ring-shaped nebula known as a bubble nebula.
==Discovery== AB7 was first listed by Azzopardi and Vigneau as a probable member of the Small Magellanic Cloud and noted to be a Wolf Rayet star. It was numbered 336a, the "a" meaning it is an addition between 336 and 337 of the existing catalogue. The catalogue stars are referred to with the acronym Az or AzV, so AB7 is also called AzV 336a. A close companion is noted although at the distance of the SMC it is not really that close and not physically related.