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Keck HIRES spectroscopy of SkyMapper commissioning survey candidate extremely metal-poor stars
Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia;Univ Padua, Dipartimento Fis & Astron Galileo Galilei, Vicolo Osservatorio 3, IT-35122 Padua, Italy;CISAS, Ctr Ateneo Studi & Attivita Spaziali Giuseppe Col, IT-35131 Padua, Italy.
Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia.
Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia;Monash Univ, Sch Phys & Astron, Wellington Rd, Clayton, Vic 3800, Australia;Monash Univ, Fac Informat Technol, Wellington Rd, Clayton, Vic 3800, Australia.
Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia;Ctr Excellence Astrophys Three Dimens ASTRO 3D, Canberra, ACT, Australia.
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2019 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 485, no 4, p. 5153-5167Article in journal (Refereed) Published
Abstract [en]

We present results from the analysis of high-resolution spectra obtained with the Keck HIRES spectrograph for a sample of 17 candidate extremely metal-poor (EMP) stars originally selected from commissioning data obtained with the SkyMapper telescope. Fourteen of the stars have not been observed previously at high dispersion. Three have [Fe/H] <= -3.0, while the remainder, with two more metal-rich exceptions, have -3.0 <= [Fe/H] <= -2.0 dex. Apart from Fe, we also derive abundances for the elements C, N, Na, Mg, Al, Si, Ca, Sc, Ti, Cr, Mn, Co, Ni, and Zn, and for n-capture elements Sr, Ba, and Eu. None of the current sample of stars is found to be carbon-rich. In general, our chemical abundances follow previous trends found in the literature, although we note that two of the most metal-poor stars show very low [Ba/Fe] (similar to-1.7) coupled with low [Sr/Ba] (similar to-0.3). Such stars are relatively rare in the Galactic halo. One further star, and possibly two others, meet the criteria for classification as a r-I star. This study, together with that of Jacobson et al. (2015), completes the outcomes of the SkyMapper commissioning data survey for EMP stars.

Place, publisher, year, edition, pages
OXFORD UNIV PRESS , 2019. Vol. 485, no 4, p. 5153-5167
Keywords [en]
stars: abundances, stars: Population II, Galaxy: halo, Galaxy: stellar content
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-390639DOI: 10.1093/mnras/stz645ISI: 000474880400051OAI: oai:DiVA.org:uu-390639DiVA, id: diva2:1344581
Funder
EU, Horizon 2020, 797100Australian Research CouncilAvailable from: 2019-08-21 Created: 2019-08-21 Last updated: 2019-08-21Bibliographically approved

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