Spectroscopic Validation of Low-metallicity Stars from RAVE

Placco, Vinicius M.; Beers, Timothy C.; Santucci, Rafael M.; Chanamé, Julio; Sepúlveda, María Paz; Coronado, Johanna; Points, Sean D.; Kaleida, Catherine C.; Rossi, Silvia; Kordopatis, Georges; Lee, Young Sun; Matijevič, Gal; Frebel, Anna; Hansen, Terese T.; Holmbeck, Erika M.; Rasmussen, Kaitlin C.; Roederer, Ian U.; Sakari, Charli M.; Whitten, Devin D.

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Journal Article

Spectroscopic Validation of Low-metallicity Stars from RAVE

MPS-Authors

Placco, Vinicius M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Beers, Timothy C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Santucci, Rafael M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Chanamé, Julio
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sepúlveda, María Paz
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Coronado, Johanna
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Points, Sean D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kaleida, Catherine C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rossi, Silvia
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kordopatis, Georges
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lee, Young Sun
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Matijevič, Gal
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Frebel, Anna
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hansen, Terese T.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Holmbeck, Erika M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rasmussen, Kaitlin C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Roederer, Ian U.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sakari, Charli M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Whitten, Devin D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2018AJ....155..256P
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Citation

Placco, V. M., Beers, T. C., Santucci, R. M., Chanamé, J., Sepúlveda, M. P., Coronado, J., et al. (2018). Spectroscopic Validation of Low-metallicity Stars from RAVE. The Astronomical Journal, 155.

Cite as: https://hdl.handle.net/21.11116/0000-0005-CBB6-9

Abstract

We present results from a medium-resolution (R ̃ 2000) spectroscopic follow-up campaign of 1694 bright (V < 13.5), very metal-poor star candidates from the RAdial Velocity Experiment (RAVE). Initial selection of the low-metallicity targets was based on the stellar parameters published in RAVE Data Releases 4 and 5. Follow up was accomplished with the Gemini-N and Gemini-S, the ESO/NTT, the KPNO/Mayall, and the SOAR telescopes. The wavelength coverage for most of the observed spectra allows for the determination of carbon and α-element abundances, which are crucial for considering the nature and frequency of the carbon- enhanced metal-poor (CEMP) stars in this sample. We find that 88% of the observed stars have [{Fe}/{{H}}] ≤ -1.0, 61% have [{Fe}/{{H}}] ≤ -2.0, and 3% have [{Fe}/{{H}}] ≤ -3.0 (with four stars at [{Fe}/{{H}}] ≤ -3.5). There are 306 CEMP star candidates in this sample, and we identify 169 CEMP Group I, 131 CEMP Group II, and 6 CEMP Group III stars from the A(C) versus [Fe/H] diagram. Inspection of the [α /{{C}}] abundance ratios reveals that five of the CEMP Group II stars can be classified as “mono-enriched second-generation” stars. Gaia DR1 matches were found for 734 stars, and we show that transverse velocities can be used as a confirmatory selection criteria for low-metallicity candidates. Selected stars from our validated list are being followed-up with high-resolution spectroscopy to reveal their full chemical- abundance patterns for further studies.