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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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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-D16C-6 Version Permalink: https://hdl.handle.net/21.11116/0000-0005-D16D-5
Genre: Journal Article

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

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Free keywords: stars: abundances stars: Population II Galaxy: halo Galaxy: stellar content Astrophysics - Solar and Stellar Astrophysics Astrophysics - Astrophysics of Galaxies
 Abstract: 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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 Dates: 2019
 Publication Status: Issued
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Title: Monthly Notices of the Royal Astronomical Society
Source Genre: Journal
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Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 2195 Identifier: -