Classical Cepheids and the Spiral Structure of the Milky Way

Dambis, A.K.; Berdnikov, L.N.; Efremov, Yu M.; Kniazev, A. Yu; Rastorguev, A.S.; Glushkova, E.V.; Kravtsov, V.V.; Turner, David Gerald, 1945-; Majaess, Daniel J.; Sefako, R.

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Classical Cepheids and the Spiral Structure of the Milky Way

Dambis, A.K.; Berdnikov, L.N.; Efremov, Yu M.; Kniazev, A. Yu; Rastorguev, A.S.; Glushkova, E.V.; Kravtsov, V.V.; Turner, David Gerald, 1945-; Majaess, Daniel J.; Sefako, R.

Date: 2015-09-13

Type: Text

ISSN: 1063-7737
1562-6873

Source:

Astronomy letters 41 (9), 489-500. (2015)

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.

Description:

Published version

Subject:

Cepheids
Milky Way

Persistent URL: https://dx.doi.org/10.1134/S1063773715090017

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Copyright statement:

The version of record of this article, first published in Astronomy Letters, is available online at Publisher’s website: https://doi.org/10.1134/S1063773715090017

Published Version: DOI: 10.1134/S1063773715090017