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Classical Cepheids and the spiral structure of the milky way

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Abstract

We use data on space distribution of the currently most complete sample of Cepheids with reliable distances (565 stars), located within ~5 kpc from the Sun, to study the spiral pattern of the Milky Way galaxy. We estimate the pitch angle as 9°−10°; the most accurate estimate, i = 9.5° ± 0.1°, was obtained assuming the existence of a global four-armed spiral pattern; the solar phase angle in the spiral pattern is χ⊙ = −121° ± 3°. Comparing positions of the spiral arms delineated by classical Cepheids and galactic masers, with the age difference of these objects in mind, we estimate the rotation angular speed of the spiral pattern to be Ω P = 25.2 ± 0.5 km s−1kpc−1.

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Author information

Authors and Affiliations

  1. Sternberg Astronomical Institute, Moscow State University, Universitetskii pr. 13, Moscow, 119992, Russia

    A. K. Dambis, L. N. Berdnikov, Yu. N. Efremov, A. Yu. Kniazev, A. S. Rastorguev, E. V. Glushkova & V. V. Kravtsov

  2. Astronomy and Astrophysics Research Division, Entoto Observatory and Research Center, P.O.Box 8412, Addis Ababa, Ethiopia

    L. N. Berdnikov

  3. South African Astronomical Observatory, P.O. Box 9, Observatory, Cape Town, 7935, South Africa

    A. Yu. Kniazev & R. Sefako

  4. Southern African Large Telescope, P.O. Box 9, Observatory, Cape Town, 7935, South Africa

    A. Yu. Kniazev

  5. Department of Physics, Faculty of Natural Sciences, University of Atacama, Copayapu 485, Copiapó, Chile

    V. V. Kravtsov

  6. Department of Astronomy and Physics, Saint Mary’s University, Halifax, NS B3H 3C3, Canada

    D. G. Turner & D. J. Majaess

Authors
  1. A. K. Dambis
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  2. L. N. Berdnikov
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  3. Yu. N. Efremov
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  4. A. Yu. Kniazev
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  5. A. S. Rastorguev
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  6. E. V. Glushkova
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  7. V. V. Kravtsov
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  8. D. G. Turner
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  9. D. J. Majaess
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  10. R. Sefako
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Correspondence to A. K. Dambis.

Additional information

Original Russian Text © A.K. Dambis, L.N. Berdnikov, Yu.N. Efremov, A.Yu. Kniazev, A.S. Rastorguev, E.V. Glushkova, V.V. Kravtsov, D.G. Turner, D.J. Majaess, R. Sefako, 2015, published in Pis’ma v Astronomicheskiĭ Zhurnal, 2015, Vol. 41, No. 9, pp. 533–544.

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Dambis, A.K., Berdnikov, L.N., Efremov, Y.N. et al. Classical Cepheids and the spiral structure of the milky way. Astron. Lett. 41, 489–500 (2015). https://doi.org/10.1134/S1063773715090017

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