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Local Variations of the Velocity Ellipsoid

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Unsolved Problems of the Milky Way

Part of the book series: International Astronomical Union / Union Astronomique Internationale ((IAUS,volume 169))

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Abstract

We have analyzed the distribution of residual velocities of nearby stars (within 200 pc of the Sun) looking for space variations on the velocity ellipsoid. We used a sample of 1071 main sequence stars of spectral types B, A and F selected from the Hipparcos Input Catalogue [7] with uvbyH, ß photometric data. Ages have been calculated following [1]. Six subsamples with 8.07 ≤ log(age) ≤ 9.45 have been considered.

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References

  1. Asian, R. (1993), Degree in Physics, Universitat de Barcelona 2. Mayor, M. (1970), A&A 6, 60

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  2. Menge de Freitas, S. (1982), A&A Suppl. Ser. 49, 687

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  3. Moreno, M., Torra, J. (1989), in Errors, bias and uncertainties in Astronomy C. Jaschek and F. Murtagh (eds.), Cambridge University Press, p. 377

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  4. Oblak, E. (1983), A&A 123, 238

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  5. Oblak, E., Moreno, M., Torra, J. (1993), in Workshop on Databases for Galactic Structure, Swarthmore (USA) (in press)

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  6. Turon, C. and 53 collaborators (1992), The Hipparcos Input Catalogue, ESA SP-1136

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© 1996 Springer Science+Business Media Dordrecht

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Moreno, M., Torra, J., Oblak, E. (1996). Local Variations of the Velocity Ellipsoid. In: Blitz, L., Teuben, P. (eds) Unsolved Problems of the Milky Way. International Astronomical Union / Union Astronomique Internationale, vol 169. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-1687-6_83

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  • DOI: https://doi.org/10.1007/978-94-009-1687-6_83

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-0-7923-4040-9

  • Online ISBN: 978-94-009-1687-6

  • eBook Packages: Springer Book Archive

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