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Searches for the shell swept up by the stellar wind from Cyg OB2

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Abstract

We investigated the kinematics of ionized gas in an extended (20°×15°) region containing the X-ray Superbubble in Cygnus with the aim of finding the shell swept up by a strong wind from Cyg OB2. Hα observations were carried out with high angular and spectral resolutions using a Fabry-Perot interferometer attached to the 125-cm telescope at the Crimean Observatory of the Sternberg Astronomical Institute. We detected high-velocity gas motions, which could result from the expansion of the hypothetical shell at a velocity of 25–50 km s−1. Given the number of OB stars increased by Knödlseder (2000) by an order of magnitude, Cyg OB2 is shown to possess a wind that is strong enough [L w ≃ (1–2) × 1039 erg s−1] to produce a shell comparable in size to the X-ray Superbubble and to a giant system of optical filaments. Based on our measurements and on X-ray and infrared observations, we discuss possible observational manifestations of the shell swept up by the wind.

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Authors and Affiliations

  1. Sternberg Astronomical Institute, Universitetskii pr. 13, Moscow, 119899, Russia

    T. A. Lozinskaya & V. V. Pravdikova

  2. Space Research Institute, Russian Academy of Sciences, ul. Profsoyuznaya 84/32, Moscow, 117810, Russia

    A. V. Finoguenov

Authors
  1. T. A. Lozinskaya
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  2. V. V. Pravdikova
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  3. A. V. Finoguenov
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__________

Translated from Pis’ma v Astronomicheski\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Zhurnal, Vol. 28, No. 4, 2002, pp. 260–275.

Original Russian Text Copyright © 2002 by Lozinskaya, Pravdikova, Finoguenov.

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Lozinskaya, T.A., Pravdikova, V.V. & Finoguenov, A.V. Searches for the shell swept up by the stellar wind from Cyg OB2. Astron. Lett. 28, 223–236 (2002). https://doi.org/10.1134/1.1467257

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