Hostname: page-component-8448b6f56d-m8qmq Total loading time: 0 Render date: 2024-04-19T23:01:21.331Z Has data issue: false hasContentIssue false
  • English
  • Français

Kinematics and Ages of UV Ceti Stars

Published online by Cambridge University Press:  12 April 2016

A. Poveda ,
C. Allen  and
M.A. Herrera
A. Poveda
Affiliation:
Instituto de Astronomia, Universidad Nacional Autonoma de Mexico, Mexico
C. Allen
Affiliation:
Instituto de Astronomia, Universidad Nacional Autonoma de Mexico, Mexico

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

The kinematic properties of 93 UV Ceti stars of the solar neighborhood are studied, based on a list of flares within 25 pc of the Sun (π ≥ 0".04). With updated values for their distances, proper motions and radial velocities (Gliese & Jahreiss 1991) space velocity dispersions are calculated for these stars. It is found that the total velocity dispersion of the flare stars (σ=30±3 km s−1) is similar to that of the F5 V stars from the same catalogue, for which the conventionally estimated mean age is about 3 · 109 years. A number of flare stars are identified as members of the Hyades, Sirius or Pleiades groups. The velocity dispersions found for the nearby flare stars, as well as their scale height and the membership of some of them to young kinematic groups, indicate that they belong to the young disk population. A small number (7) of UV Ceti stars have kinematics corresponding to the thick disk or halo population. Their long-lived chromospheric activity is interpreted as due to coalescence of old contact binaries. The question of the age of Proxima Centauri is examined in the context of our results, and found to be compatible with the ages of a Centauri A and B.

Type
Flares in Late-type Stars: Radio and Optical
Information
International Astronomical Union Colloquium , Volume 151: Flares and Flashes , 1995 , pp. 57 - 60
Copyright
Copyright © Springer-Verlag 1995

References

Boesgard, A.M., Hagen, W., 1974, ApJ 189, 85 CrossRefGoogle Scholar
Gershberg, R.E. 1971, Flares of red dwarf stars, Crimean Astroph. Obs. Translated by Mullan, D.J., Armagh Obs. North Ireland Google Scholar
Gliese, W. 1969, Veröffentl. Astron. Rechen-Inst. Heidelberg, 22 Google Scholar
Gliese, W., Jahreiss, H., 1991, in Brotzman, L.E., Gessner, S.E.: Selected Astronomical Catalogs, Volume I, National Space Science Center, NASA GSFCGoogle Scholar
Gurzadyan, G.A., 1980, in Flare Stars, Terzian, Y. (ed.), Pergamon, Oxford Google Scholar
Haro, G., 1968, in Stars and Stellar Systems, Vol. 7, Nebulae and Interstellar Matter, Middlehurst, B.M. & Aller, L.H. (eds.), University of Chicago Press, Chicago, p. 141 Google Scholar
Haro, G., Chavira, E., 1966, in Vistas in Astronomy, Vol. 8, Beer, A. (ed.), Pergamon, Oxford, p. 89 Google Scholar
Haro, G., Morgan, W.W., 1953, ApJ 118, 16 Google Scholar
Iben, I. Jr., 1967, ARAA 5, 571 CrossRefGoogle Scholar
Kunkel, W.E., 1975, in Variable Stars and Stellar Evolution, Sherwood, V.E. & Plaut, L. (eds.), Reidel, Dordrecht, p. 15 Google Scholar
Maeder, A., Meynet, G., 1988, A&AS 76, 411 Google Scholar
Pettersen, B.R., 1991, Mem. Soc. Astr. Ital., 62, 217 Google Scholar
Rodonó, M., 1978, A&A 66, 175 Google Scholar
van’t Veer, F., Maceroni, C., 1989, A&A 220, 128 Google Scholar
Wielen, R., 1977, A&A 60, 263 Google Scholar