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Keck HIRES spectros...
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Marino, A. F.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
(författare)
Keck HIRES spectroscopy of SkyMapper commissioning survey candidate extremely metal-poor stars
- Artikel/kapitelEngelska2019
Förlag, utgivningsår, omfång ...
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2019-03-07
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OXFORD UNIV PRESS,2019
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printrdacarrier
Nummerbeteckningar
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LIBRIS-ID:oai:DiVA.org:uu-390639
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https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-390639URI
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https://doi.org/10.1093/mnras/stz645DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:art swepub-publicationtype
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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.
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Da Costa, G. S.Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
(författare)
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Casey, A. R.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
(författare)
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Asplund, M.Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia;Ctr Excellence Astrophys Three Dimens ASTRO 3D, Canberra, ACT, Australia
(författare)
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Bessell, M. S.Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
(författare)
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Frebel, A.MIT, Dept Phys, Cambridge, MA 02139 USA;MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA
(författare)
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Keller, S. C.Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
(författare)
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Lind, KarinUppsala universitet,Observationell astrofysik,Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany(Swepub:uu)karli488
(författare)
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Mackey, A. D.Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
(författare)
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Murphy, S. J.Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia;Univ New South Wales, Sch Phys Environm & Math Sci, Canberra, ACT 2600, Australia
(författare)
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Nordlander, T.Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia;Ctr Excellence Astrophys Three Dimens ASTRO 3D, Canberra, ACT, Australia
(författare)
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Norris, J. E.Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
(författare)
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Schmidt, B. P.Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
(författare)
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Yong, D.Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
(författare)
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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, ItalyAustralian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Monthly notices of the Royal Astronomical Society: OXFORD UNIV PRESS485:4, s. 5153-51670035-87111365-2966
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- Av författaren/redakt...
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Marino, A. F.
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Da Costa, G. S.
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Casey, A. R.
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Asplund, M.
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Bessell, M. S.
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Frebel, A.
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visa fler...
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Keller, S. C.
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Lind, Karin
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Mackey, A. D.
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Murphy, S. J.
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Nordlander, T.
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Norris, J. E.
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Schmidt, B. P.
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Yong, D.
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