HFG1和Abell 6: 行星状星云

HFG1和Abell 6: 行星状星云

2024年2月12日 HFG1 & Abell 6: Planetary Nebulae Image Credit & Copyright: Julien Cadena & Mickael Coulon; Text: Natalia Lewandowska (SUNY Oswego) Explanation: Planetary nebulae like Heckathorn-Fesen-Gull 1 (HFG1) and Abell 6 in the constellation Cassiopeia are remnants from the last phase of a medium sized star like our Sun. In spite of their shapes, planetary nebulae have nothing in common with actual planets. Located in the bottom left part of the featured photo, HFG1 was created by the binary star system V664 Cas, which consists of a white dwarf star and a red giant star. Both stars orbit their center of mass over about half an Earth day. Traveling with the entire nebula at a speed about 300 times faster than the fastest train on…