An equatorial ultra iron-poor star identified in BOSS

Abstract

We report the discovery of SDSS J131326.89-001941.4, an ultra iron-poor red giant star ([Fe/H] ~ -4.3) with a very high carbon abundance ([C/Fe]~ +2.5). This object is the fifth star in this rare class, and the combination of a fairly low effective temperature (Teff ~ 5300 K), which enhances line absorption, with its brightness (g=16.9), makes it possible to measure the abundances of calcium, carbon and iron using a low-resolution spectrum from the Sloan Digital Sky Survey. We examine the carbon and iron abundance ratios in this star and other similar objects in the light of predicted yields from metal-free massive stars, and conclude that they are consistent. By way of comparison, stars with similarly low iron abundances but lower carbon-to-iron ratios deviate from the theoretical predictions.

arXiv comment6 pages, 4 figures, accepted for publication in A&A

References in corpus (39)

• The 2.5 m Telescope of the Sloan Digital Sky Survey
• SDSS-III: Massive Spectroscopic Surveys of the Distant Universe, the Milky Way Galaxy, and Extra-Solar Planetary Systems
• The Baryon Oscillation Spectroscopic Survey of SDSS-III
• The Nucleosynthetic Signature of Population III
• The Ninth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-III Baryon Oscillation Spectroscopic Survey
• The Formation of the First Star in the Universe
• SEGUE: A Spectroscopic Survey of 240,000 stars with g=14-20
• The Multi-Object, Fiber-Fed Spectrographs for SDSS and the Baryon Oscillation Spectroscopic Survey
• Nucleosynthesis and Evolution of Massive Metal-Free Stars
• Spectral Classification and Redshift Measurement for the SDSS-III Baryon Oscillation Spectroscopic Survey
• Forming the First Stars in the Universe: The Fragmentation of Primordial Gas
• Nucleosynthetic signatures of the first stars
• A stellar relic from the early Milky Way
• The SEGUE Stellar Parameter Pipeline. I. Description and Initial Validation Tests
• Simulations on a Moving Mesh: The Clustered Formation of Population III Protostars
• The Formation of the First Low-Mass Stars From Gas With Low Carbon and Oxygen Abundances
• A Spectroscopic Study of the Ancient Milky Way: F- and G-Type Stars in the Third Data Release of the Sloan Digital Sky Survey
• The Formation and Fragmentation of Disks around Primordial Protostars
• A single low-energy, iron-poor supernova as the source of metals in the star SMSS J 031300.36-670839.3
• An extremely primitive halo star
• Feedback, Disk Self-regulation and Galaxy Formation
• A Revised Effective Temperature Scale for the Kepler Input Catalog
• New ATLAS9 And MARCS Model Atmosphere Grids for the Apache Point Observatory Galactic Evolution Experiment (APOGEE)
• Theoretical isochrones in several photometric systems II. The Sloan Digital Sky Survey ugriz system
• HE 0557-4840 - Ultra-Metal-Poor and Carbon-Rich
• The Most Metal-Poor Stars. IV. The Two Populations With [Fe/H] < -3.0
• Carbon-enhanced metal-poor stars: the most pristine objects?
• The first generation of stars: first steps towards chemical evolution of galaxies
• A primordial star in the heart of the Lion
• The Nucleosynthetic Imprint of 15-40 Solar Mass Primordial Supernovae on Metal-Poor Stars
• Exploring the Origin of Lithium, Carbon, Strontium and Barium with four new Ultra Metal-Poor Stars
• The first stars: CEMP--no stars and signatures of spinstars
• The minimum stellar metallicity observable in the Galaxy
• Deep SDSS optical spectroscopy of distant halo stars I. Atmospheric parameters and stellar metallicity distribution
• The formation of the extremely primitive star SDSS J102915+172927 relies on dust
• The Chemical Imprint of Silicate Dust on the Most Metal-Poor Stars
• The number and metallicities of the most metal-poor stars
• Deep SDSS optical spectroscopy of distant halo stars II. Iron, calcium, and magnesium abundances
• Stochastic chemical enrichment in metal-poor systems I. Theory

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• Carbon-enhanced metal-poor stars in dwarf galaxies
• Metal-Poor Stars Observed with the Magellan Telescope. III. New Extremely and Ultra Metal-Poor Stars from SDSS/SEGUE and Insights on the Formation of Ultra Metal-Poor Stars
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• The Pristine Survey IV: Approaching the Galactic metallicity floor with the discovery of an ultra metal-poor star
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