LL Pegasi binary star system, ALMA and HST image

LL Pegasi binary star system, ALMA and HST image

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Credit: ALMA (ESO/NAOJ/NRAO)/H. Kim et al., ESA/NASA and R. Sahai/SCIENCE PHOTO LIBRARY

Restrictions: This image may not be used by or to promote the arms, nuclear power or tobacco industries or any religious organisation, or in any discriminatory way, or to imply the endorsement by ESO of any product, service or activity

Caption: LL Pegasi binary star system. Composite optical and radio image combining data from the HST and ALMA telescopes. LL Pegasi is an old star that is continuously losing gaseous material as it evolves into a planetary nebula. The spiral shape seen here is the imprint made by the two stars orbiting within this gas. The resulting pinwheel-shaped nebula is known as IRAS 23166+1655. LL Pegasi is a Mira variable star. It is around 4250 light years from Earth, in the constellation of Pegasus. The optical data is from the Hubble Space Telescope (HST)'s Advanced Camera for Surveys (ACS. The radio data is from band 6 of the Atacama Large Millimeter/submillimeter Array (ALMA). Image published in 2017.

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Keywords: 1, 2017, acs, advanced camera for surveys, alma, astronomical, astronomy, astrophysical, astrophysics, atacama large millimeter array, atacama large millimeter/submillimeter array, band 6, binary star, gas, hst, hubble space telescope, iras 23166+1655, ll pegasi, mira variable, nebula, no-one, nobody, one, optical, orbiting, pegasus, protoplanetary nebula, radio, radio telescope, single, space, space telescope, spiral, spiralling, star, star system, stellar evolution, universe

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