NASA Missions Take an Unparalleled Look into Superstar Eta Carinae

Explore Eta Carinae from the inside out with the help of supercomputer simulations and data from NASA satellites and ground-based observatories.

Credit: NASA's Goddard Space Flight Center

Watch this video on the NASA Goddard YouTube channel.

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This animation zooms from outside the Homunculus Nebula, which Eta Carinae ejected in a famous outburst in the 19th century, to the system's two massive orbiting stars.

Credit: NASA Goddard CI Lab

This digital model of Eta Carinae was created from hydrodynamic simulations performed on a NASA supercomputer. The gray area shows the dense wind of the primary star. The gold region shows the high-temperature region where the opposing stellar winds interact. The system is shown three months after the stars' closest approach. Converting the simulation to a digital model for 3-D printing revealed spine-like protrusions (left) from the interaction region that had not been noticed in the simulations. This strucuture is likely caused by instabilities in gas flowing along the walls of the cavity hollowed out by the smaller, hotter star.

Download the Eta Car colliding wind models for 3D printing:
high mass-loss version
low mass-loss version

Credit: NASA Goddard CI Lab

Same as above, but shows the system when the stars are at closest approach (periastron).

Credit: NASA Goddard CI Lab

Same as above, but the model shows the system when the stars are farthest apart (apastron).

Credit: NASA Goddard CI Lab

In this supercomputer simulation, the stars of Eta Carinae are shown as black dots in a view above their orbital plane. Lighter colors indicate greater densities in the stellar winds produced by each star. At closest approach, the fast wind of the smaller star carves a tunnel in the thicker wind of the larger star. The scene is 20 astronomical units (1.9 billion miles or 2.9 billion km) across, a distance slightly larger than the diameter of Saturn's orbit in our solar system.

Credit: NASA's Goddard Space Flight Center/T. Madura

For 4k frames and video of this and several other simulation renderings, go toour page #11722.

Same as above, but depicts a scene 10 times larger.

Credit: NASA's Goddard Space Flight Center/T. Madura

Same as above, but showing a scene 10 times larger. This movie shows a wide view of the system looking along the orbital plane of the two stars, located at the center. The view spans 3,200 times the average distance between Earth and the sun, or 298 billion miles (478 billion kilometers). Lighter colors indicate greater densities, with the highest densities occuring near the primary and in the wind interaction region. The faster wind of the smaller star carves a spiral cavity into the dense wind of the primary star, and this structure expands outward with the primary wind.

Credit: NASA's Goddard Space Flight Center/T. Madura

Seen in blue light emitted by doubly ionized iron atoms (4659 angstroms), these images of Eta Carinae were captured by Hubble's STIS instrument between 2010 and 2014. Gas shells created during the binary's 2003 close approach race outward at about 1 million mph (1.6 million km/h). The structure vanishes at this wavelength when the stars approach and the UV light of the smaller, hotter star, which excites this emission, is aborbed by the densest part of the primary star's wind.

This animation shows changes in Eta Carinae's X-ray brightness observed near periastron passages from 1998 to 2014 by NASA's Rossi X-ray Timing Explorer (RXTE) and the X-Ray Telescope on NASA's Swift satellite. The brightest emission yet seen arose from flares in mid-2014, when the stars were approaching each other. The background is an X-ray image of the system taken by NASA's Chandra X-ray Observatory, and the brightest X-ray variations seen in the RXTE and Swift data have been superimposed on it. Optical data suggests the 2014 X-ray flares were a product of changes in the wind of the system's smaller, hotter star.

Credit: NASA's Goddard Space Flight Center/M. Corcoran

Preparing the computer simulations for 3-D printing revealed previously unidentified features. This photo of a printed model, made on a consumer-grade 3-D printer, shows the interacting winds on top and the spine-like protrusions they form in the months around the stars' closest approach.

Credit: NASA's Goddard Space Flight Center

3-D-printed models of the Eta Carinae supercomputer simulation showing the system at apastron (left), periastron (center), and three months after periastron, when finger-like protrusions are prominent in the interaction region.

Ccredit: NASA's Goddard Space Flight Center

Another view of a 3-D-printed model, showing the interacting winds (top) three months after the stars' closest approach and the newly identified protrusions they form.

Credit: NASA's Goddard Space Flight Center

A collection of 3-D-printed models of a new supercomputer simulation tracking the interacting winds of Eta Carinae. In the foreground, the interaction region (left) is seen three months after the stars' closest approach, when newly identified spine-like protrusions form along a cavity created in the primary star's wind.

Credit: NASA's Goddard Space Flight Center