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Keck HIRES spectroscopy of SkyMapper commissioning survey candidate extremely metal-poor stars

Marino, A. F. (författare)
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
Da Costa, G. S. (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
Casey, A. R. (författare)
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
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Asplund, M. (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia;Ctr Excellence Astrophys Three Dimens ASTRO 3D, Canberra, ACT, Australia
Bessell, M. S. (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
Frebel, A. (författare)
MIT, Dept Phys, Cambridge, MA 02139 USA;MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA
Keller, S. C. (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
Lind, Karin (författare)
Uppsala universitet,Observationell astrofysik,Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
Mackey, A. D. (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
Murphy, S. J. (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia;Univ New South Wales, Sch Phys Environm & Math Sci, Canberra, ACT 2600, Australia
Nordlander, T. (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia;Ctr Excellence Astrophys Three Dimens ASTRO 3D, Canberra, ACT, Australia
Norris, J. E. (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
Schmidt, B. P. (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
Yong, D. (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
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 (creator_code:org_t)
2019-03-07
2019
Engelska.
Ingår i: Monthly notices of the Royal Astronomical Society. - : OXFORD UNIV PRESS. - 0035-8711 .- 1365-2966. ; 485:4, s. 5153-5167
  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
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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.

Ämnesord

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Nyckelord

stars: abundances
stars: Population II
Galaxy: halo
Galaxy: stellar content

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