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  The SkyMapper DR1.1 Search for Extremely Metal-Poor Stars

Da Costa, G. S., Bessell, M. S., Mackey, A. D., Nordlander, T., Asplund, M., Casey, A. R., et al. (2019). The SkyMapper DR1.1 Search for Extremely Metal-Poor Stars. Monthly Notices of the Royal Astronomical Society, 2195.

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Datensatz-Permalink: https://hdl.handle.net/21.11116/0000-0005-D16C-6 Versions-Permalink: https://hdl.handle.net/21.11116/0000-0005-D16D-5
Genre: Zeitschriftenartikel

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externe Referenz:
https://ui.adsabs.harvard.edu/abs/2019MNRAS.tmp.2195D (beliebiger Volltext)
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 Urheber:
Da Costa, G. S.1, Autor
Bessell, M. S.1, Autor
Mackey, A. D.1, Autor
Nordlander, T.1, Autor
Asplund, M.1, Autor
Casey, A. R.1, Autor
Frebel, A.1, Autor
Lind, K.1, Autor
Marino, A. F.1, Autor
Murphy, S. J.1, Autor
Norris, J. E.1, Autor
Schmidt, B. P.1, Autor
Yong, D.1, Autor
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

Inhalt

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Schlagwörter: stars: abundances stars: Population II Galaxy: halo Galaxy: stellar content Astrophysics - Solar and Stellar Astrophysics Astrophysics - Astrophysics of Galaxies
 Zusammenfassung: 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 ≈ 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% have [Fe/H] ≤ -2.75 and only ̃7% 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]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 ∆(Log N)/∆[Fe/H] = 1.5 ± 0.1 dex per dex for -4.0 ≤ [Fe/H] ≤ -2.75, but appears to drop abruptly at [Fe/H] ≈ -4.2, in line with previous studies.

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 Datum: 2019
 Publikationsstatus: Erschienen
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Titel: Monthly Notices of the Royal Astronomical Society
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: - Artikelnummer: - Start- / Endseite: 2195 Identifikator: -