The age of the Galactic thin disk from Th/Eu nucleocosmochronology: extended sample

@article{Peloso2005TheAO,
  title={The age of the Galactic thin disk from Th/Eu nucleocosmochronology: extended sample},
  author={E. F. del Peloso and L. Pinheiro da Silva and Gustavo F. Porto de Mello and L. I. Arany-Prado Observatorio NacionalMCT and R. D. Janeiro and Brazil. and Observatorio do ValongoUFRJ},
  journal={Proceedings of the International Astronomical Union},
  year={2005},
  volume={1},
  pages={485 - 486}
}
We report the determination of the age of the Galactic thin disk by means of Th/Eu nucleocosmochronology. This method is only weakly dependent on stellar evolutions models, therefore allowing an important verification of the most used dating techniques, which are the fitting of isochrones to the oldest Galactic open clusters, and the calculation of white dwarf cooling sequences. This work builds upon our previous determination (del Peloso et al. 2005a, 2005b), by including 7 new objects to the… 

The age of the Galactic thin disk from Th/Eu nucleocosmochronology. I. Determination of [Th/Eu] abundance ratios

The purpose of this work is to resume investigation of Galactic thin disk dating using nucleocosmochronology with Th/Eu stellar abundance ratios, a theme absent from the literature since 1990. A

Thorium in solar twins: implications for habitability in rocky planets

We have investigated the thorium (Th) abundance in a sample of 53 thin disc solar twins covering a wide range of ages. These data provide constrains on the mantle energy budget of terrestrial planets

Dynamical evidence of the age-metallicity relation in the Milky Way disk

Aims. We studied the relationship between the average stellar abundance of several elements and the orbital evolution of stars in the neighbourhood of the Sun. Methods. We used both observational

Basic physical parameters of a selected sample of evolved stars

We present the detailed spectroscopic analysis of 72 evolved stars, which were previously studied for accurate radial velocity variations. Using one Hyades giant and another well studied star as the

The age of the Galaxy's thick disk

Abstract We discuss the age of the stellar disks in the solar neighborhood. After reviewing the various methods for age dating, we discuss current estimates of the ages of both the thin- and the

Search for cold debris disks around M-dwarfs. II

Although 70% of the stars in the Galaxy are M-dwarfs, thermal emission searches for cold debris disks have been conducted mostly for A-type and solar-type stars. We report on new λ = 1.2 mm continuum

Do Most Planetary Nebulae Derive from Binaries? I. Population Synthesis Model of the Galactic Planetary Nebula Population Produced by Single Stars and Binaries

We present a population synthesis calculation to derive the total number of planetary nebulae (PNs) in the Galaxy that descend from single stars and stars in binary systems. Using the most recent

Turn-off of deuterium astration in the recent star formation of the Galaxy disc

Chemical features of the local stellar disc have firmly established that long-term, continuous star formation has been accompanied by a steady rate of accretion of low-metallicity gas from the halo.

The Ages of Stars

The age of an individual star cannot be measured, only estimated through mostly model-dependent or empirical methods, and no single method works well for a broad range of stellar types or for a full

Chemical composition of high proper-motion stars based on short-wavelength optical spectra

The results of spectroscopic observations made with the NES echelle spectrograph of the 6-m BTA telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences in the wavelength

References

SHOWING 1-10 OF 22 REFERENCES

The age of the Galactic thin disk from Th/Eu nucleocosmochronology - II. Chronological analysis

The purpose of this work is to resume investigation of Galactic thin disk dating using nucleocosmochronology with Th/Eu stellar abundance ratios, a theme absent from the literature since 1990.

The age of the Galactic thin disk from Th/Eu nucleocosmochronology. I. Determination of [Th/Eu] abundance ratios

The purpose of this work is to resume investigation of Galactic thin disk dating using nucleocosmochronology with Th/Eu stellar abundance ratios, a theme absent from the literature since 1990. A

A lower limit of 9.5 Gyr on the age of the Galactic disk from the oldest white dwarf stars

WHITE dwarf stars represent the final evolutionary state for most main-sequence stars. They cool slowly enough that even the oldest white dwarfs are still observable in sufficiently deep surveys and

Chemical evolution of primary elements in the Galactic disc: an analytical model

We model the evolution of abundances of oxygen, iron, and r-process elements in the Galactic disk using the instantaneous and delayed production approximations which enable the problem to be handled

Measurement of stellar age from uranium decay

The observation of this cosmochronometer gives the most direct age determination of the Galaxy, and with improved theoretical and laboratory data, it will provide a highly precise lower limit to the age of the Universe.

A survey for cool white dwarfs and the age of the Galactic disc

We describe a new multi-colour proper motion survey for cool white dwarfs (CWDs). The observational database consists of ~300 digitally scanned Schmidt plates in ESO/SERC field 287. The entire survey

The Cool White Dwarf Luminosity Function and the Age of the Galactic Disk

We present new optical and infrared data for the cool white dwarfs in the proper motion sample of Liebert, Dahn, & Monet. Stellar properties—surface chemical composition, effective temperature,

The Chemical Evolution of Cool White Dwarfs and the Age of the Local Galactic Disk

Photometric and spectroscopic observations of 110 cool white dwarf stars are presented and analyzed with state-of-the-art model atmosphere calculations appropriate for cool white dwarfs with pure

The White Dwarf Cooling Sequence of the Globular Cluster Messier 4

We present the white dwarf sequence of the globular cluster M4, based on a 123 orbit Hubble Space Telescope exposure, with a limiting magnitude of V ~ 30 and I ~ 28. The white dwarf luminosity

Age Estimates of Globular Clusters in the Milky Way: Constraints on Cosmology

The 95% confidence level lower limit on the age of the Universe of 11.2 billion years means that the three fundamental observables in cosmology now independently support the case for a dark energy–dominated Universe.