BINARY POPULATIONS IN MILKY WAY SATELLITE GALAXIES: CONSTRAINTS FROM MULTI-EPOCH DATA IN THE CARINA, FORNAX, SCULPTOR, AND SEXTANS DWARF SPHEROIDAL GALAXIES

@article{Minor2013BINARYPI,
  title={BINARY POPULATIONS IN MILKY WAY SATELLITE GALAXIES: CONSTRAINTS FROM MULTI-EPOCH DATA IN THE CARINA, FORNAX, SCULPTOR, AND SEXTANS DWARF SPHEROIDAL GALAXIES},
  author={Quinn Minor},
  journal={The Astrophysical Journal},
  year={2013},
  volume={779}
}
  • Q. Minor
  • Published 1 February 2013
  • Physics
  • The Astrophysical Journal
We introduce a likelihood analysis of multi-epoch stellar line-of-sight velocities to constrain the binary fractions and binary period distributions of dwarf spheroidal galaxies. This method is applied to multi-epoch data from the Magellan/MMFS survey of the Carina, Fornax, Sculptor, and Sextans dSph galaxies, after applying a model for the measurement errors that accounts for binary orbital motion. We find that the Fornax, Sculptor, and Sextans dSphs are consistent with having binary… 

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References

SHOWING 1-10 OF 37 REFERENCES

STELLAR VELOCITIES IN THE CARINA, FORNAX, SCULPTOR, AND SEXTANS dSph GALAXIES: DATA FROM THE MAGELLAN/MMFS SURVEY

We present spectroscopic data for individual stars observed from 2004 March through 2008 August as part of our Michigan/MIKE Fiber System (MMFS) survey of four dwarf spheroidal (dSph) galaxies:

A COMPLETE SPECTROSCOPIC SURVEY OF THE MILKY WAY SATELLITE SEGUE 1: DARK MATTER CONTENT, STELLAR MEMBERSHIP, AND BINARY PROPERTIES FROM A BAYESIAN ANALYSIS

We introduce a comprehensive analysis of multi-epoch stellar line-of-sight velocities to determine the intrinsic velocity dispersion of the ultrafaint satellites of the Milky Way. Our method includes

The mass and velocity anisotropy of the Carina, Fornax, Sculptor and Sextans dwarf spheroidal galaxies

We model the large kinematic data sets for the four Milky Way dwarf spheroidal (dSph) satellites: Carina, Fornax, Sculptor and Sextans, recently published by Walker et al. The member stars are

The Mass-to-Light Ratios of the Draco and Ursa Minor Dwarf Spheroidal Galaxies. II. The Binary Population and its Effects on the Measured Velocity Dispersions of Dwarf Spheroidals

We use a large set of radial velocities in the Ursa Minor and Draco dwarf spheroidal galaxies to search for binary stars and to infer the binary frequency. Of the 118 stars in our sample with

Inverse dynamical population synthesis: Constraining the initial conditions of young stellar clusters by studying their binary populations

Binary populations in young star clusters show multiplicit y fractions both lower and up to twice as high as those observed in the Galactic field. We follow the evolution of a population of bin ary

The star formation and chemical evolution history of the Fornax dwarf spheroidal galaxy

We have combined deep photometry in the B, V and I bands from CTIO/MOSAIC of the Sculptor dwarf spheroidal galaxy, going down to the oldest main sequence turn-offs, with spectroscopic metallicity

Evolutionary Processes in Close Binary Systems

The structure and evolution of the stars constitute one of the main prob­ lems of modern astrophysics. Binary stars are so common that it is not pos­ sible to develop a comprehensive theory of

The ACS survey of Galactic globular clusters. XII. Photometric binaries along the main sequence

Context. The fraction of binary stars is an important ingredient to interpret globular cluster dynamical evolution and their stellar population. Aims. We investigate the properties of main-sequence

A COMPLETE SPECTROSCOPIC SURVEY OF THE MILKY WAY SATELLITE SEGUE 1: THE DARKEST GALAXY

We present the results of a comprehensive Keck/DEIMOS spectroscopic survey of the ultra-faint Milky Way satellite galaxy Segue 1. We have obtained velocity measurements for 98.2% of the stars within

Wide binaries in the Orion nebula cluster

Using proper motion data for 894 stars in the Orion Nebula Cluster (ONC) compiled by Jones & Walker in 1988, we search for binaries with apparent separations in the range 1000-5000 AU, and find an