Program: GS-2021A-Q-419

Title:Identification of Low-Metallicity Stars from Narrow-Band Photometry
PI:Vinicius Placco
Co-I(s):

Abstract

This proposal aims to measure stellar atmospheric parameters (Teff, logg, and [Fe/H]) and carbon-abundance ratios, [C/Fe], for a sample of 87 metal-poor star candidates, by obtaining medium-resolution GMOS-S spectroscopy. These stars were selected based on narrow-band photometry from the S-PLUS survey data. With estimated Teff, logg, [Fe/H], and [C/Fe] in hand, derived by a well-tested spectroscopic analysis pipeline, it will be possible to test the parameter estimates derived from photometry, and improve the determinations for future data releases. If these candidates are confirmed to be low-metallicity, high-resolution spectroscopy can be carried out with Gemini/GHOST and SOAR/STELES. High-resolution spectroscopic follow-up of one candidate observed in a similar Gemini program in 2019 revealed a chemically peculiar (ultra metal-poor) star, which is one of only 35 stars found to date (Placco et al. 2021, ApJL, in press). The remaining 87 candidates in this proposal will finish the pilot study in the Southern Hemisphere.

Publications using this program's data