![]() This will allow to constrain their further evolution Significant higher mass-loss rates than predicted by radiation-driven wind theory might turn the O(He) stars into PG 1159 stars. The proposed FUV spectroscopy aims to determine the mass-loss rates and C and O abundances of all four presently known O(He) stars for the first time. ![]() Latest and popular WPS Presentation templates are. Or they just experienced a less efficient mass loss on the AGB and define a new evolutionary channel into the DO white dwarfs. Download free PPT templates with attractive background designs for your presentation in WPS Templates. stellar wind will take off the remaining He-rich envelope and lay free carbon- and oxygen-rich material at their surface. ![]() Thus, two possibilities are conceivable to interpret their evolutionary status Either they are direct PG 1159 progenitors and ongoing mass loss due to a. In contrast to the latter, they do neither show carbon nor oxygen lines in their optical spectra but exhibit almost pure He II absorption-line spectra. Easily create a professional resume with MyPerfectResume Choose a template to personalize, follow our expert guidance, and download your resume in minutes. The O(He) stars are found in the post-AGB region of the HRD, just amongst the PG 1159 stars.
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