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Mining S-PLUS for Metal-poor Stars in the Milky Way

Abstract : This work presents the medium-resolution (R ~ 1500) spectroscopic follow-up of 522 low-metallicity star candidates from the Southern Photometric Local Universe Survey (S-PLUS). The objects were selected from narrowband photometry, taking advantage of the metallicity-sensitive S-PLUS colors. The follow-up observations were conducted with the Blanco and Gemini South telescopes, using the COSMOS and GMOS spectrographs, respectively. The stellar atmospheric parameters (T eff, $\mathrm{log}\,g$ , and [Fe/H]), as well as carbon and α-element abundances, were calculated for the program stars in order to assess the efficacy of the color selection. Results show that ${92}_{-3}^{+2} \% $ of the observed stars have [Fe/H] ≤ -1.0, ${83}_{-3}^{+3} \% $ have [Fe/H] ≤ -2.0, and ${15}_{-3}^{+3} \% $ have [Fe/H] ≤ -3.0, including two ultra metal-poor stars ([Fe/H] ≤ -4.0). The 80th percentile for the metallicity cumulative distribution function of the observed sample is [Fe/H] = -2.04. The sample also includes 68 carbon-enhanced metal-poor stars. Based on the calculated metallicities, further S-PLUS color cuts are proposed, which can increase the fractions of stars with [Fe/H] ≤ -1.0 and ≤ -2.0 to 98% and 88%, respectively. Such high success rates enable targeted high-resolution spectroscopic follow-up efforts, as well as provide selection criteria for fiber-fed multiplex spectroscopic surveys.
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https://hal-insu.archives-ouvertes.fr/insu-03763065
Contributor : Olivier Hauss Connect in order to contact the contributor
Submitted on : Monday, August 29, 2022 - 4:07:28 PM
Last modification on : Tuesday, August 30, 2022 - 3:31:55 AM
Long-term archiving on: : Wednesday, November 30, 2022 - 6:52:22 PM

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Vinicius M. Placco, Felipe Almeida-Fernandes, Anke Arentsen, Young Sun Lee, William Schoenell, et al.. Mining S-PLUS for Metal-poor Stars in the Milky Way. The Astrophysical Journal Supplement Series, 2022, 262, ⟨10.3847/1538-4365/ac7ab0⟩. ⟨insu-03763065⟩

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