Author ORCID Identifier
Document Type
Article
Publication Date
2017
Publication Title
Open Astronomy
Volume
26
Issue
1
First Page
202
Last Page
207
Abstract
The majority of hot subdwarfs lie on or close to the helium main-sequence. Many have hydrogen-rich surfaces, but a substantial fraction of the hotter subdwarfs have hydrogen-depleted or hydrogen-deficient surfaces. Amongst the former, three were known to show extraordinary overabundances of heavy elements including zirconium and lead. Using Subaru/HDS,we commenced a high-resolution survey of hydrogen-depleted subdwarfs to discover new members of the class. UVO 0825+15, was found to exhibit strong lead lines, to be an intrinsic variable in K2 field 5, and to have a relatively high space motion. Two other lead-rich subdwarfs have been found in the Subaru sample. A much wider survey is in progress using SALT/HRS. Discoveries so far include one extreme helium star similar to V652 Her, and an intermediate helium star with possible comparison to HD144941. Analyses of the hotter and more compact members of the sample are continuing.
Recommended Citation
Jeffery, C. Simon; Neelamkodan, Naslim; Woolf, Vincent M.; Crawford, Steven M.; and Østensen, Roy H., "Subaru and SALT spectroscopy of chemically peculiar hot subdwarfs" (2017). Physics Faculty Publications. 56.
https://digitalcommons.unomaha.edu/physicsfacpub/56
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Comments
©2017 C. S. Jeffery et al., published by De Gruyter Open.
https://doi.org/10.1515/astro-2017-0439