Eta Carinae

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Eta Carinae

(kă-ree -nee, -nÿ, -rÿ -nee) (η Car) One of the most luminous and unstable stars in the Galaxy, lying at a distance of 2000 parsecs in the constellation Carina. It displays a large variation in magnitude at very irregular periods. Halley cataloged it as a 4th-magnitude star in 1677. From 1835 to 1845 it outshone every star except Sirius, reaching a magnitude of –0.8 in 1843; it has since faded, the magnitude range having been between 5.9 and 7.9 since 1880. Eta Carinae is an example of a luminous blue variable. It is surrounded by a shell of cool dust that emits strongly at a wavelength of 20 μm. The decrease in light output observed after 1843 is assumed to have been caused by the ejection of the dust. The dust obscures the light output of the star (which may well have remained constant), converting the light to infrared radiation. Eta Carinae's total luminosity is about five million times that of the Sun, its temperature is 29 000 K, and its mass is about 120 solar masses. It is surrounded by a small cloud of ejected gas (the Keyhole nebula) that contains a high abundance of nitrogen, indicating that much nucleosynthesis has taken place.
References in periodicals archive ?
Eta Car is one of the most massive stars in the Milky Way, estimated to have 120 Suns' worth of material.
In the framework of an international campaign to obtain multi-wavelength observations, one group who instituted an annual optical CCD monitoring program of eta Car is that of Fernandez-Lajus et al.
But yesterday, police sealed off Majorca after a suspected ETA car bomb attack.
The explosion comes 12 days after an ETA car bomb injured a policeman in the Basque province of Viscaya in the north of Spain.
At the start of the EU summit on Friday, three ETA car bombs rocked Marbella, Fuengirola and Zaragoza.
When an ETA car bomb kills one of Oliveira's associates, Oliveira asks Charli to protect his daughter, Marta (Silvia Abascal), and, after some cat-and-mouse games, Charli and Marta end up sleeping together.
The Environmental Transport Association produces the ETA Car Buyers' Guide which ranks the environmental impact of vehicles in several categories including exhaust emissions, fuel consumption and noise.
The annual ETA Car Buyer's Guide ranks 500 models by emissions of carbon monoxide, carbon dioxide and pollutants linked to summer smogs, in nine categories including small hatchbacks, luxury cars and sports vehicles.
And with the realization that Eta Car is a binary in a 5.
THE audience gave a standing ovation to the mother of a civil guard shot dead while foiling an Eta car bomb on Madrid.
For one thing, every 51/2-years Eta Car repeats a complex series of X-ray and spectroscopic chanL-es.
Mr Aznar, who survived an ETA car bomb attack when he was opposition leader in 1995, said: "No negotiation is possible or desirable with these assassins who so many times have sown death all around Spain.