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The Spectral Type of the Ionizing Stars and the Infrared Fluxes of HII Regions

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An Erratum to this article was published on 05 August 2019

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Abstract

The 20-cm radio continuum fluxes of 91 HII regions in a previously compiled catalog have been determined. The spectral types of the ionizing stars in 42 regions with known distances are estimated. These spectral types range from B0.5 to O7, corresponding to effective temperatures of 29 000–37 000 K. The dependences of the infrared (IR) fluxes at 8, 24, and 160 μm on the 20-cm flux are considered. The IR fluxes are used as a diagnostic of heating of the matter, and the radio fluxes as measurements of the number of ionizing photons. It is established that the IR fluxes grow approximately linearly with the radio flux. This growth of the IR fluxes probably indicates a growth of the mass of heated material in the envelope surrounding the HII region with increasing effective temperature of the star.

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Change history

  • 05 August 2019

    Several errors were found in this paper, which however did not influence its main conclusions. In Table 2 of Section 2, the references for the data in columns (6)–(9) and (10)–(11) were given incorrectly, and incorrect values for <Emphasis Type="Italic">T</Emphasis><Subscript>eff</Subscript> were given in column (10). These errors were discovered by the authors in the course of using the data in other studies, and do not make a signficant contributions to the figures, results, or conclusions of this paper.

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Authors and Affiliations

  1. Institute of Astronomy, Russian Academy of Sciences, ul. Pyatnitskaya 48, Moscow, 119017, Russia

    A. P. Topchieva & M. S. Kirsanova

  2. Barkhatova Kourovka Astronomical Observatory, Yeltsin Ural Federal University, pr. Lenina 51, Yekaterinburg, 620000, Russia

    M. S. Kirsanova & A. M. Sobolev

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  1. A. P. Topchieva
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  2. M. S. Kirsanova
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  3. A. M. Sobolev
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Correspondence to A. P. Topchieva.

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Original Russian Text © A.P. Topchieva, M.S. Kirsanova, A.M. Sobolev, 2018, published in Astronomicheskii Zhurnal, 2018, Vol. 95, No. 11, pp. 798–807.

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Topchieva, A.P., Kirsanova, M.S. & Sobolev, A.M. The Spectral Type of the Ionizing Stars and the Infrared Fluxes of HII Regions. Astron. Rep. 62, 764–773 (2018). https://doi.org/10.1134/S1063772918110082

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  • DOI: https://doi.org/10.1134/S1063772918110082

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