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PB 8783: the first sdO star suitable for asteroseismic modeling?
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Pulsating hot B subdwarf (sdB) stars, which are core-He burning objects, are one of the showcases of asteroseismology. Thanks to the combination of rich pulsation spectra and state-of-the-art modeling tools it is possible to tightly constrain fundamental parameters such as the stellar mass. There are on the contrary very few hotter sdO pulsators, which are in a more advanced evolutionary stage. Some of them are identified in Globular Clusters (GCs), but they are extremely rare in the field. Recently, it was suggested that PB8783, one of the very first sdB pulsators discovered in 1997, may in fact be an unrecognized hot sdO star with very similar properties to the GC pulsators. We present here new very high-quality spectroscopy of PB8783 as well as an asteroseismic analysis of the pulsator and answer the question: is PB 8783 the first sdO star suitable for asteroseismic modeling?
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Cited by 1 Pith paper
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Heavy-metal enrichment in the intermediate He-sdOB pulsator Feige 46
Feige 46, a pulsating intermediate-helium hot subdwarf, shows extreme overabundances of Sr, Y, and Zr (over 10,000 times solar), matching the other known V366 Aqr pulsator LS IV-14 116.
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