K-band image of the unstable star Eta Carinae

Eta Carinae is one of the heaviest and most luminous stars known. Its mass probably exceeds 100 solar masses, and the star is about 4 million times brighter than the Sun. Such a massive star has a comparatively short lifetime of about 1 million years; when measured in the cosmic timescale, Eta Carinae must have formed quite recently. This star is highly unstable and prone to violent outbursts. These outbursts are caused by the very high radiation pressure at the star's upper layers, which blows significant portions of the matter at the "surface" into space during eruptions that may rage for several years. The last of these outbursts occurred between 1835 and 1855, peaking in 1843. Despite its large distance from Earth of some 7,500 to 10,000 light-years, Eta Carinae briefly became the second brightest star in the sky at that time (with an apparent magnitude -1), surpassed only by Sirius. This image is an infrared narrow K-band image of the massive star Eta Carinae. The image quality is difficult to estimate because the central star saturated the detector, but the clear structure of the diffraction spikes and the size of the smallest features visible in the photo indicate a near-diffraction limited performance. The field measures about 6.5 x 6.5 square arcsec.

Credit:

ESO

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About the Image

Id:eso0313i
Type:Observation
Release date:13 May 2003
Related releases:eso0313
Size:800 x 822 px

About the Object

Name:Eta Carinae
Type:• Milky Way : Star : Type : Variable
• X - Stars
Distance:8000 light years

Image Formats

Large JPEG
117.2 KB
Screensize JPEG
116.4 KB

Wallpapers

1024x768
131.1 KB
1280x1024
184.3 KB
1600x1200
235.7 KB
1920x1200
264.8 KB
2048x1536
326.5 KB

Colours & filters

BandWavelengthTelescope
Infrared
K
2.2 μm Very Large Telescope Interferometer
AMBER

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