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η Carinae (Eta Carinae, abbreviated to η Car), formerly known as η Argus, is a stellar system containing at least two stars with a combined luminosity greater than five million times that of the Sun, located around 7,500 light-years (2,300 parsecs) distant in the constellation Carina.
The Cosmic Cliffs at the edge of NGC 3324, one of the first images taken by the James Webb Space Telescope. The Carina Nebula [7] or Eta Carinae Nebula [8] (catalogued as NGC 3372; also known as the Great Carina Nebula [9]) is a large, complex area of bright and dark nebulosity in the constellation Carina, located in the Carina–Sagittarius Arm of the Milky Way galaxy.
It includes the young star clusters Collinder 228, NGC 3293, NGC 3324, IC 2581, Trumpler 14, Trumpler 15 and Trumpler 16, [2] the last being the home of Eta Carinae. It also includes another massive and luminous star, HD 93129A. It is approximately 2,680 parsecs (8,700 ly) from Earth. [3]
To match those observations, the models require much higher mass loss rates. Eta Carinae A has one of the highest known mass loss rates, currently around 10 −3 M ☉ /year, and is an obvious candidate for study. [95] Eta Carinae A is losing so much mass due to its extreme luminosity and relatively low surface gravity.
The most luminous are more than a million L ☉ (Eta Carinae reaches 4.6 million) and have masses approaching, possibly exceeding, 100 M ☉. The least luminous have luminosities around a quarter of a million L ☉ and masses as low as 10 M ☉ , although they would have been considerably more massive as main-sequence stars, due to their rapid ...
HD 93205, or V560 Carinae, is a binary stellar system, in the Carina Nebula (NGC 3372) in the constellation Carina. It consists of two massive O-stars that revolve around each other in 6 days . The more massive member of the pair is an O3.5 main sequence star.
The Eta Carinids are a meteor shower lasting from January 14 to 27 each year, peaking on January 21. C. S. Nilsson of the Adelaide Observatory discovered them in 1961 in Australia. [1] Roughly two to three meteors occur per hour at its maximum. [2] It gets its name from the radiant which is close to the stellar system Eta Carinae.
Statistical tests are used to test the fit between a hypothesis and the data. [1] [2] Choosing the right statistical test is not a trivial task. [1]The choice of the test depends on many properties of the research question.