February 27, 2024

The star CW Leonis seems in an astronomical picture highlighted by NASA on Monday (17), in a picture captured by the Hubble Telescope. It’s 400 gentle years away from us, and it’s thought of the closest carbon star to Earth.

This star seems to be surrounded by a gaseous cloud wealthy in carbon, with a construction of arcs and envelopes. It’s not identified for certain what’s behind the construction, and you may test it out within the picture under:

The star’s orange colour is the results of atmospheric carbon coming from the star’s inside by means of nuclear fusion. Attributable to their decrease gravity, these stars are capable of launch carbon and derived compounds into area extra effectively.

Along with the orange shell, the star has one other unusual characteristic: there are rays of sunshine in it, the depth of which has modified in brightness over a interval of solely 15 years. The time could be very quick in astronomical phrases, and it was attributable to a course of that’s unknown in the intervening time.

What’s a carbon star?

To know carbon stars, one should first recall the processes in stars of medium mass. After they exhaust their reserves of hydrogen for nuclear fusion, the star collapses and finally turns into a crimson big.

Most carbon stars are of this sort, which partly explains their reddish hue. One more reason lies within the outer layers of those stars, which scatter blue-green gentle. Solely crimson and orange gentle can cross the barrier and attain our eyes.

Additionally, carbon stars are variable, which signifies that the depth of their gentle modifications periodically. This distinction can happen inside just a few months, however it could possibly additionally take greater than a 12 months.

supply: APOD