English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
 
 
DownloadE-Mail
  Spectroscopic Validation of Low-metallicity Stars from RAVE

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.

Item is

Files

show Files

Locators

show
hide
Description:
-
OA-Status:

Creators

show
hide
 Creators:
Placco, Vinicius M.1, Author
Beers, Timothy C.1, Author
Santucci, Rafael M.1, Author
Chanamé, Julio1, Author
Sepúlveda, María Paz1, Author
Coronado, Johanna1, Author
Points, Sean D.1, Author
Kaleida, Catherine C.1, Author
Rossi, Silvia1, Author
Kordopatis, Georges1, Author
Lee, Young Sun1, Author
Matijevič, Gal1, Author
Frebel, Anna1, Author
Hansen, Terese T.1, Author
Holmbeck, Erika M.1, Author
Rasmussen, Kaitlin C.1, Author
Roederer, Ian U.1, Author
Sakari, Charli M.1, Author
Whitten, Devin D.1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

Content

show
hide
Free keywords: Galaxy: halo stars: abundances stars: atmospheres stars: carbon stars: Population II techniques: imaging spectroscopy Astrophysics - Solar and Stellar Astrophysics Astrophysics - Astrophysics of Galaxies
 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.

Details

show
hide
Language(s):
 Dates: 2018
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: -
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: The Astronomical Journal
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 155 Sequence Number: - Start / End Page: - Identifier: -