Articulo
The rapid evolution of the central star of the Stingray Nebula - latest news from the HST
Registro en:
issn:1742-6588
Autor
Reindl, Nicole
Rauch, Thomas
Miller Bertolami, Marcelo Miguel
Werner, Klaus
Institución
Resumen
SAO 244567 is an unusually fast evolving star. Within twenty years only, it had turned from a B-type supergiant into the central star of the Stingray Nebula. Space- and ground-based observations obtained over the last decades have revealed that its spectrum changes noticeably over just a few years, showing stellar evolution in real time. The low mass of SAO 244567 is, however, in strong contradiction with canonical post-asymptotic giant branch evolution. Thus, its fast evolution has been a mystery for decades. We present preliminary results of the non-LTE spectral analyis of the recently obtained HST/COS observations, which finally allow us to shed light on the evolutionary history of this extraordinary object. Facultad de Ciencias Astronómicas y Geofísicas Instituto de Astrofísica de La Plata