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The Velocity Dispersions of the Draco and Ursa Minor Dwarf Spheroidal Galaxies

Published online by Cambridge University Press:  07 August 2017

C. Pryor ,
E. W. Olszewski  and
T. E. Armandroff
C. Pryor
Affiliation:
Rutgers, the State Univ. of New Jersey, Dept. of Phys. & Astron., P.O. Box 849, Piscataway, NJ 08855
E. W. Olszewski
Affiliation:
Steward Observatory, Univ. of Arizona, Tucson, AZ 85721
T. E. Armandroff
Affiliation:
NOAO, Kitt Peak National Obs., P.O. Box 26732, Tucson, AZ 85726

Extract

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We have used the Hydra fiber positioner and the bench spectrograph on the KPNO 4 m telescope to measure radial velocities for giants in the Draco (Dra) and Ursa Minor (UMi) dwarf spheroidal galaxies. The measurement uncertainties are 1–10 km s−1 per observation, with the median uncertainty being 3.6 km s−1. To date, we have reduced the data from two of our three runs. In UMi these have yielded 150 velocities for 85 member giants; 52 stars have two or more measurements. In Dra we have 108 velocities for 84 member giants and 20 stars have two or more measurements. There is good agreement between the repeat observations and with the Olszewski, Aaronson, & Hill (1995) MMT echelle velocities.

Type
Poster Papers
Information
Symposium - International Astronomical Union , Volume 164: Stellar Populations , 1995 , pp. 418 - 419
Copyright
Copyright © Kluwer 1995 

References

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