Does the chemical signature of TYC 8442-1036-1 originate from a rotating massive star that died in a faint explosion?

Abstract

Context. We have recently investigated the origin of chemical signatures observed in Galactic halo stars by means of a stochastic chemical evolution model. We have found that rotating massive stars are a promising way to explain several signatures observed in these fossil stars. Aims. In the present paper we discuss how the extremely metal-poor halo star TYC 8442-1036-1, for which we have now obtained detailed abundances from VLT-UVES spectra, fits into the framework of our previous work. Methods. We apply a standard 1D LTE analysis to the spectrum of this star. We measure the abundances of 14 chemical elements; for Na, Mg, Ca, Sc, Ti, V, Cr, Mn, Fe, Ni and Zn we compute the abundances using equivalent widths; for C, Sr and Ba we obtain the abundances by means of synthetic spectra generated by MOOG. Results. We find an abundance of [Fe/H]= $-$3.5 $\pm$0.13 dex based on our high resolution spectrum; this points to an iron content lower by a factor of three (0.5 dex) compared to the one obtained by a low resolution spectrum. The star has a [C/Fe] = 0.4 dex, and it is not carbon enhanced like most of the stars at this metallicity. Moreover, this star lies in the plane [Ba/Fe] vs. [Fe/H] in a relatively unusual position, shared by a few others galactic halo stars that is only marginally explained by our past results. Conclusions. The comparison of the model results with the chemical abundance characteristics of this group of stars can be improved if we consider in our model the presence of faint supernovae coupled with rotating massive stars. These results seem to imply that rotating massive stars and faint supernovae scenarios are complementary to each other, and are both required in order to match the observed chemistry of the earliest phases of the chemical enrichment of the Universe.

arXiv comment13 pages, 6 figures, accepted for publication in Astronomy and Astrophysics

References in corpus (59)

• The chemical composition of the Sun
• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• First stars V - Abundance patterns from C to Zn and supernova yields in the early Galaxy
• Nucleosynthesis Yields of Core-Collapse Supernovae and Hypernovae, and Galactic Chemical Evolution
• Stellar evolution with rotation VIII: Models at Z = 10^{-5} and CNO yields for early galactic evolution
• Nucleosynthetic signatures of the first stars
• Magnetorotationally driven Supernovae as the origin of early galaxy $r$-process elements?
• A stellar relic from the early Milky Way
• A Search for Stars of Very Low Metal Abundance. VI. Detailed Abundances of 313 Metal-Poor Stars
• The extreme r-element rich, iron-poor halo giant CS31082-001: Implications for the r-process site(s) and radioactive cosmochronology
• Evolution, nucleosynthesis and yields of low mass AGB stars
• First stars VI - Abundances of C, N, O, Li, and mixing in extremely metal-poor giants. Galactic evolution of the light elements
• Energy Input and Mass Redistribution by Supernovae in the Interstellar Medium
• Evolution, nucleosynthesis and yields of low mass AGB stars at different metallicities (II): the FRUITY database
• The early star generations: the dominant effect of rotation on the CNO yields
• Non-LTE calculations for neutral Na in late-type stars using improved atomic data
• A single low-energy, iron-poor supernova as the source of metals in the star SMSS J 031300.36-670839.3
• NLTE line formation of Fe in late-type stars II: 1D spectroscopic stellar parameters
• The Most Metal-Poor Stars. II. Chemical Abundances of 190 Metal-Poor Stars Including 10 New Stars With [Fe/H] < -3.5
• The r-process nucleosynthesis in the various jet-like explosions of magnetorotational core-collapse supernovae
• A new code for automatic determination of equivalent widths: Automatic Routine for line Equivalent widths in stellar Spectra (ARES)
• Carbon-Enhanced Metal-Poor Star Frequencies in the Galaxy: Corrections for the Effect of Evolutionary Status on Carbon Abundances
• Very low metallicity massive star models: Pre-SN evolution and primary nitrogen production
• $s$-process production in rotating massive stars at solar and low metallicities
• HE 0557-4840 - Ultra-Metal-Poor and Carbon-Rich
• NLTE abundances of Mn in a sample of metal-poor stars
• A strong case for fast stellar rotation at very low metallicities
• Non-standard s process in low metallicity massive rotating stars
• The s process in massive stars at low metallicity. Effect of primary N14 from fast rotating stars
• Spectroscopic Studies of Very Metal-Poor Stars with the Subaru High Dispersion Spectrograph. III. Light Neutron-Capture Elements
• Bright Metal-Poor Stars from the Hamburg/ESO Survey. I. Selection and Follow-up Observations from 329 Fields
• Chromium: NLTE abundances in metal-poor stars and nucleosynthesis in the Galaxy
• Binarity in Carbon-Enhanced Metal-Poor stars
• Production and evolution of Li, Be and B isotopes in the Galaxy
• First stars IX -Mixing in extremely metal-poor giants. Variation of the 12C/13C, [Na/Mg] and [Al/Mg] ratios
• An Elemental Assay of Very, Extremely, and Ultra Metal-Poor Stars
• Silver and palladium help unveil the nature of a second r-process
• Fallback Supernovae: A Possible Origin of Peculiar Supernovae with Extremely Low Explosion Energies
• Are C-rich ultra iron poor stars also He-rich?
• The role of neutron star mergers in the chemical evolution of the Galactic halo
• The Origin of Carbon-Enhancement and Initial Mass Function of Extremely Metal-Poor Stars in the Galactic Halo
• The Connection between Gamma-Ray Bursts and Extremely Metal-Poor Stars: Black Hole-forming Supernovae with Relativistic Jets
• The s-process in the Galactic halo: the fifth signature of spinstars in the early Universe?
• Iron-Group Abundances in the Metal-Poor Main Sequence Turnoff Star HD~84937
• The chemical evolution of Barium and Europium in the Milky Way
• A new imprint of fast rotators: low 12C/13C ratios in extremely metal-poor halo stars
• An inhomogeneous model for the Galactic halo: a possible explanation for the spread observed in s- and r-process elements
• Explaining the Ba, Y, Sr, and Eu abundance scatter in metal-poor halo stars: constraints to the r-process
• Carbon-Enhanced Metal-Poor Stars: Relics from the Dark Ages
• Are There Any Stars Lacking Neutron-Capture Elements? Evidence from Strontium and Barium
• Nine New Metal-Poor Stars on the Subgiant and Red Horizontal Branches with High Levels of r-process Enhancement
• Astrophysical tests of atomic data important for stellar Mg abundance determinations
• Abundances of carbon-enhanced metal-poor stars as constraints on their formation
• Mg line formation in late-type stellar atmospheres: II. Calculations in a grid of 1D models
• A grid of NLTE corrections for magnesium and calcium in late-type giant and supergiant stars: application to Gaia
• The stellar content of the Hamburg/ESO survey VI. The metallicity distribution of main-sequence turnoff stars in the Galactic halo
• An inefficient dwarf: Chemical abundances and the evolution of the Ursa Minor dwarf spheroidal galaxy
• The first stars: a classification of CEMP-no stars
• The effects of stellar winds of fast-rotating massive stars in the earliest phases of the chemical enrichment of the Galaxy

Cited by in corpus (6)

• Uncertainties in s-process nucleosynthesis in low mass stars determined from Monte Carlo variations
• Constraints on stellar rotation from the evolution of Sr and Ba in the Galactic halo
• Manganese spread in Ursa Minor as a proof of sub-classes of type Ia supernovae
• Espresso observations of HE 0107$-$5240 and other CEMP-no stars with $[Fe/H]\le -4.5$
• Explaining the ${}^{12}\text{C}{/}^{13}\text{C}$ ratio in the Galactic halo: the contribution from shell mergers in primordial massive stars
• The oldest stars of the bulge: new information on the ancient Galaxy