Astronomers Find the Oldest Planetary Nebula - by spacewriter
The team also assumed the expansion speed has remained effectively the same since the beginning. Combining all that, you get the time elapsed since dying the star first ejected its outer layers. In this case, it comes to 70,000 years. By comparison, most “typical” planetary nebulae only last about 5,000 to 25,000 years. That’s a relatively quick time, compared to the life of the star, which could have been around hundreds of millions or billions of years.
The planetary nebula found in M37 . Courtesy Laboratory for Space Research and Department of Physics at The University of Hong Kong . In addition, the fact that IPHASX J055226.2+323724 is still visible despite its age and expanded size, makes it doubly rare. Its location shows that it “lives on” in a relatively “safe” environment. That home in an open cluster allows the expanding gas and dust cloud to fade. If the star were in the interstellar medium, the shell could be disrupted by other influences.
Dr.
Initial mass function describes the distribution of stellar masses that form in one star-forming event in a given volume in space. It covers all stellar objects, from low-mass brown dwarfs to the most massive stars formed. It’s important in clusters as a way of understanding the range of stars they contain and, along with the existence of IPHASX J055226.2+323724, give insight into the types of stars in M37.
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