Classical Cepheids and the spiral structure of the milky way

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• 作者：A. K. Dambis ; L. N. Berdnikov ; Yu. N. Efremov ; A. Yu. Kniazev…
• 关键词：Galactic structure ; Cepheids ; spiral arms
• 刊名：Astronomy Letters
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：41
• 期：9
• 页码：489-500
• 全文大小：1,520 KB
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• 作者单位：A. K. Dambis (1)
  L. N. Berdnikov (1) (2)
  Yu. N. Efremov (1)
  A. Yu. Kniazev (1) (3) (4)
  A. S. Rastorguev (1)
  E. V. Glushkova (1)
  V. V. Kravtsov (1) (5)
  D. G. Turner (6)
  D. J. Majaess (6)
  R. Sefako (3)
  
  1. Sternberg Astronomical Institute, Moscow State University, Universitetskii pr. 13, Moscow, 119992, Russia
  2. Astronomy and Astrophysics Research Division, Entoto Observatory and Research Center, P.O.Box 8412, Addis Ababa, Ethiopia
  3. South African Astronomical Observatory, P.O. Box 9, Observatory, Cape Town, 7935, South Africa
  4. Southern African Large Telescope, P.O. Box 9, Observatory, Cape Town, 7935, South Africa
  5. Department of Physics, Faculty of Natural Sciences, University of Atacama, Copayapu 485, Copiapó, Chile
  6. Department of Astronomy and Physics, Saint Mary’s University, Halifax, NS B3H 3C3, Canada
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Astronomy
  Astrophysics
  Russian Library of Science
  
• 出版者：MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC.
• ISSN：1562-6873

文摘

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°?0°; 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_{⊿/sub> = ?21° ± 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?kpc?. Keywords Galactic structure Cepheids spiral arms}