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The SkyMapper DR1.1...
The SkyMapper DR1.1 search for extremely metal-poor stars
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- Da Costa, G. S. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 0200, Australia
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- Bessell, M. S. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 0200, Australia
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- Mackey, A. D. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 0200, Australia;ARC Ctr Excellence Astrophys Three Dimens ASTRO 3, Canberra, ACT, Australia
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- Nordlander, T. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 0200, Australia;ARC Ctr Excellence Astrophys Three Dimens ASTRO 3, Canberra, ACT, Australia
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- Asplund, M. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 0200, Australia;ARC Ctr Excellence Astrophys Three Dimens ASTRO 3, Canberra, ACT, Australia
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- Casey, A. R. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 0200, 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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- Frebel, A. (författare)
- MIT, Dept Phys, Cambridge, MA 02139 USA;MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA
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- Lind, Karin (författare)
- Uppsala universitet,Observationell astrofysik,Max Planck Inst Astron, Konigstuhl 17, D-D69117 Heidelberg, Germany
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- Marino, A. F. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 0200, Australia;Univ Padua, Dipartimento Fis & Astron Galileo Galilei, Vicolo Osservatorio 3, I-35122 Padua, Italy;Ctr Ateneo & Attivita Spaziali Giuseppe Colombo C, Via Venezia 15, I-35131 Padua, Italy
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- Murphy, S. J. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 0200, Australia;Univ New South Wales, Sch Sci, Canberra, ACT 2600, Australia
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- Norris, J. E. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 0200, Australia
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- Schmidt, B. P. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 0200, Australia
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- Yong, D. (författare)
- Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 0200, Australia;ARC Ctr Excellence Astrophys Three Dimens ASTRO 3, Canberra, ACT, Australia
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(creator_code:org_t)
- 2019-09-12
- 2019
- Engelska.
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Ingår i: Monthly notices of the Royal Astronomical Society. - : OXFORD UNIV PRESS. - 0035-8711 .- 1365-2966. ; 489:4, s. 5900-5918
- Relaterad länk:
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http://arxiv.org/pdf...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- We present and discuss the results of a search for extremely metal-poor stars based on photometry from data release DR1.1 of the SkyMapper imaging survey of the southern sky. In particular, we outline our photometric selection procedures and describe the low-resolution (R approximate to 3000) spectroscopic follow-up observations that are used to provide estimates of effective temperature, surface gravity, and metallicity ([Fe/H]) for the candidates. The selection process is very efficient: of the 2618 candidates with low-resolution spectra that have photometric metallicity estimates less than or equal to -2.0, 41 per cent have [Fe/H] <= -2.75 and only approximately seven per cent have [Fe/H] > -2.0 dex. The most metal-poor candidate in the sample has [Fe/H] < -4.75 and is notably carbon rich. Except at the lowest metallicities ([Fe/H] < -4), the stars observed spectroscopically are dominated by a 'carbon-normal' population with [C/Fe](1D, LTE) <= +1 dex. Consideration of the A(C)(1D, LTE) versus [Fe/H](1D, LTE) diagram suggests that the current selection process is strongly biased against stars with A(C)(1D, LTE) > 7.3 (predominantly CEMP-s) while any bias against stars with A(C)(1D, LTE) < 7.3 and [C/Fe](1D, LTE) > +1 (predominantly CEMP-no) is not readily quantifiable given the uncertainty in the SkyMapper v-band DR1.1 photometry. We find that the metallicity distribution function of the observed sample has a power-law slope of Delta(Log N)/Delta[Fe/H] = 1.5 +/- 0.1 dex per dex for -4.0 <= [Fe/H] <= -2.75, but appears to drop abruptly at [Fe/H] approximate to -4.2, in line with previous studies.
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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- Av författaren/redakt...
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Da Costa, G. S.
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Bessell, M. S.
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Mackey, A. D.
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Nordlander, T.
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Asplund, M.
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Casey, A. R.
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Frebel, A.
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Lind, Karin
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Marino, A. F.
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Murphy, S. J.
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Norris, J. E.
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Schmidt, B. P.
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Yong, D.
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