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Sökning: id:"swepub:oai:DiVA.org:uu-390639" > Keck HIRES spectros...

  • 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 ...

  • 2019-03-07
  • OXFORD UNIV PRESS,2019
  • printrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:oai:DiVA.org:uu-390639
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-390639URI
  • https://doi.org/10.1093/mnras/stz645DOI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

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  • Ämneskategori:ref swepub-contenttype
  • Ämneskategori:art swepub-publicationtype

Anmärkningar

  • 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 och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Da Costa, G. S.Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia (författare)
  • 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)
  • Asplund, M.Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia;Ctr Excellence Astrophys Three Dimens ASTRO 3D, Canberra, ACT, Australia (författare)
  • Bessell, M. S.Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia (författare)
  • Frebel, A.MIT, Dept Phys, Cambridge, MA 02139 USA;MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA (författare)
  • Keller, S. C.Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia (författare)
  • Lind, KarinUppsala universitet,Observationell astrofysik,Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany(Swepub:uu)karli488 (författare)
  • Mackey, A. D.Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia (författare)
  • 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)
  • Nordlander, T.Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia;Ctr Excellence Astrophys Three Dimens ASTRO 3D, Canberra, ACT, Australia (författare)
  • Norris, J. E.Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia (författare)
  • Schmidt, B. P.Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia (författare)
  • Yong, D.Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia (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, ItalyAustralian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:Monthly notices of the Royal Astronomical Society: OXFORD UNIV PRESS485:4, s. 5153-51670035-87111365-2966

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