HD 140283: A STAR IN THE SOLAR NEIGHBORHOOD THAT FORMED SHORTLY AFTER THE BIG BANG

@article{Bond2013HD1A,
  title={HD 140283: A STAR IN THE SOLAR NEIGHBORHOOD THAT FORMED SHORTLY AFTER THE BIG BANG},
  author={Howard E. Bond and Edmund P. Nelan and Don A. VandenBerg and Gail H. Schaefer and Dianne L. Harmer},
  journal={The Astrophysical Journal Letters},
  year={2013},
  volume={765}
}
HD 140283 is an extremely metal-deficient and high-velocity subgiant in the solar neighborhood, having a location in the Hertzsprung–Russell diagram where absolute magnitude is most sensitive to stellar age. Because it is bright, nearby, unreddened, and has a well-determined chemical composition, this star avoids most of the issues involved in age determinations for globular clusters. Using the Fine Guidance Sensors on the Hubble Space Telescope, we have measured a trigonometric parallax of 17… 

Tables from this paper

Three Ancient Halo Subgiants: Precise Parallaxes, Compositions, Ages, and Implications for Globular Clusters

The most accurate ages for the oldest stars are those obtained for nearby halo subgiants because they depend almost entirely on just the measured parallaxes and absolute oxygen abundances. In this

High-resolution abundance analysis of HD 140283

HD 140283 is a reference subgiant that is metal poor and confirmed to be a very old star. The abundances of this type of old star can constrain the nature and nucleosynthesis processes that occurred

The age structure of the Milky Way's halo

We present a new, high-resolution chronographic (age) map of the Milky Way’s halo, based on the inferred ages of ∼130,000 field blue horizontal-branch (BHB) stars with photometry from the Sloan

ON THE HUBBLE SPACE TELESCOPE TRIGONOMETRIC PARALLAX OF THE DWARF NOVA SS CYGNI

SS Cygni is one of the brightest dwarf novae (DNe), and one of the best studied prototypes of the cataclysmic variables. Astrometric observations with the Fine Guidance Sensors (FGSs) on the Hubble

THE AGES OF 55 GLOBULAR CLUSTERS AS DETERMINED USING AN IMPROVED METHOD ALONG WITH COLOR–MAGNITUDE DIAGRAM CONSTRAINTS, AND THEIR IMPLICATIONS FOR BROADER ISSUES

Ages have been derived for 55 globular clusters (GCs) for which Hubble Space Telescope Advanced Camera for Surveys photometry is publicly available. For most of them, the assumed distances are based

A SEARCH FOR CORONAL ACTIVITY AMONG TWO METAL-POOR SUBDWARFS AND ONE SUBGIANT

A search has been made using the XMM-Newton satellite for coronal soft X-ray emission from HD 19445, HD 25329, and HD 140283, three Population II stars in the Galactic halo having metallicities of .

12C/13C ratio and CNO abundances in the classical very old metal-poor dwarf HD 140283

Context. The isotope abundances provide powerful diagnostics of the chemical enrichment in our Galaxy. The star HD 140283 is one of the best-studied very metal-poor dwarf stars. It is very old, and

Star Cluster Ages in the Gaia Era

We use the framework developed as part of the MESA Isochrones and Stellar Tracks (MIST) project to assess the utility of several types of observables in jointly measuring the age and 1D stellar model

Hubble Space Telescope Trigonometric Parallax of Polaris B, Companion of the Nearest Cepheid

Polaris, the nearest and brightest Cepheid, is a potential anchor point for the Leavitt period–luminosity relation. However, its distance is a matter of contention, with recent advocacy for a
...

References

SHOWING 1-10 OF 47 REFERENCES

The Age of Globular Clusters in Light of Hipparcos: Resolving the Age Problem?

We review five independent techniques that are used to set the distance scale to globular clusters, including subdwarf main-sequence fitting utilizing the recent Hipparcos parallax catalog. These

Permitted Oxygen Abundances and the Temperature Scale of Metal-poor Turnoff Stars

We use high-quality VLT/UVES published data of the permitted O I triplet and Fe II lines to determine oxygen and iron abundances in unevolved (dwarfs, turnoff, subgiants) metal-poor halo stars. The

Ages of Globular Clusters from HIPPARCOS Parallaxes of Local Subdwarfs

We report here initial but strongly conclusive results for absolute ages of Galactic globular clusters (GGCs). This study is based on high-precision trigonometric parallaxes from the HIPPARCOS

Younger and Brighter - New Distances to Globular Clusters Based on HIPPARCOS Parallax Measurements of Local Subdwarfs

We have used new parallax measurements, obtained by the Hipparcos satellite, of fifteen nearby, metal-poor stars to re-define the subdwarf main-sequence. All of these stars have parallaxes determined

The Location of a Few Subdwarfs in the Theoretical H-R Diagram and the Helium Content of Population II

It is shown that photometric systems in which the line blocking is small enough to be accurately determined, like the GRI colors of Stebbins and Whitford, the vby colors of Strömgren, or the VRIJK

The End of Nucleosynthesis: Production of Lead and Thorium in the Early Galaxy

We examine the Pb and Th abundances in 27 metal-poor stars (−3.1< [Fe/H] <−1.4) whose very heavy metal (Z > 56) enrichment was produced only by the rapid (r-) nucleosynthesis process. New abundances

BERYLLIUM, OXYGEN, AND IRON ABUNDANCES IN EXTREMELY METAL-DEFICIENT STARS

The abundance of beryllium in the oldest, most metal-poor stars acts as a probe of early star formation and Galactic chemical evolution. We have analyzed high-resolution, high signal-to-noise ratio

Models for Old, Metal-Poor Stars with Enhanced α-Element Abundances. II. Their Implications for the Ages of the Galaxy’s Globular Clusters and Field Halo Stars

The ages of globular clusters (GCs) and post-turnoff field stars in the Galactic halo are derived using new stellar evolutionary models that explicitly take into account the observed abundances of

Beryllium abundances in metal‐poor stars★

We have determined beryllium (Be) abundances for 25 metal-poor stars based on the high-resolution and high signal-to-noise ratio spectra from the Very Large Telescope/Ultraviolet and Visual Echelle

An absolutely calibrated T eff scale from the infrared flux method. Dwarfs and subgiants

Various effective temperature scales have been proposed over the years. Despite much work and the high internal precision usually achieved, systematic differences of order 100 K (or more) among