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Cepheid kinematics and the Galactic warp

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Abstract

The space velocities of 200 long-period (P>5 days) classical Cepheids with known proper motions and line-of-sight velocities whose distances were estimated from the period-luminosity relation have been analyzed. The linear Ogorodnikov-Milne model has been applied, with the Galactic rotation having been excluded from the observed velocities in advance. Two significant gradients have been found in the Cepheid velocities, ∂W/∂Y = −2.1 ± 0.7 km s−1 kpc−1 and ∂V/∂Z = 27 ± 10 km s−1 kpc−1. In such a case, the angular velocity of solid-body rotation around the Galactic X axis directed to the Galactic center is −15 ± 5 km s−1 kpc−1.

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Authors and Affiliations

  1. Pulkovo Astronomical Observatory, Russian Academy of Sciences, Pulkovskoe sh. 65, St. Petersburg, 196140, Russia

    V. V. Bobylev

  2. Sobolev Astronomical Institute, St. Petersburg State University, Universitetskii pr. 28, Petrodvorets, 198504, Russia

    V. V. Bobylev

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  1. V. V. Bobylev
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Correspondence to V. V. Bobylev.

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Original Russian Text © V.V. Bobylev, 2013, published in Pis’ma v Astronomicheskiĭ Zhurnal, 2013, Vol. 39, No. 12, pp. 909–915.

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Bobylev, V.V. Cepheid kinematics and the Galactic warp. Astron. Lett. 39, 819–825 (2013). https://doi.org/10.1134/S1063773713120025

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