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Abstract <p>This paper is the second in a series of papers dedicated to the analysis of spectral and photometric observations of the Herbig Ae/Be star HD 179218. The variations in the H<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11755_2025_5242_Article_IEq1.gif" Format="GIF" Height="10" Rendition="HTML" Resolution="72" Type="Linedraw" Width="14" /> </InlineMediaObject> <EquationSource Format="TEX">\(\alpha\)</EquationSource> <!--ASPBull2460081Ismailov-m1--> </InlineEquation> and H<InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11755_2025_5242_Article_IEq2.gif" Format="GIF" Height="17" Rendition="HTML" Resolution="72" Type="Linedraw" Width="15" /> </InlineMediaObject> <EquationSource Format="TEX">\(\beta\)</EquationSource> <!--ASPBull2460081Ismailov-m2--> </InlineEquation> line profiles in the star’s spectrum and the variations in its brightness and color indices in the <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11755_2025_5242_Article_IEq3.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="66" /> </InlineMediaObject> <EquationSource Format="TEX">\(UBVRI\)</EquationSource> <!--ASPBull2460081Ismailov-m3--> </InlineEquation> system are investigated. Regular variations of the profiles with periods from 37 to 737 days at a significance level of <InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11755_2025_5242_Article_IEq4.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="33" /> </InlineMediaObject> <EquationSource Format="TEX">\(10^{-4}\)</EquationSource> <!--ASPBull2460081Ismailov-m4--> </InlineEquation> were revealed. Two of the found spectral periods agree with the photometric ones within the error limits. The regular spectral and photometric variability we discovered may indicate a presence of a companion or an exoplanet/exoplanets around the star, and may also be associated with the precession of the accretion disk and variation of the accretion rate.</p>

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Structural and Kinematic Features of the Gaseous Envelope of the Unusual Herbig Ae Star HD 179218 II. Long-term Spectral and Photometric Variability

  • 期刊论文

  • 发表日期：

    2025年3月1日

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  • N. Z. Ismailov,
  • M. A. Pogodin,
  • A. F. Kholtygin,
  • H. N. Adigozalzade,
  • O. V. Kozlova,
  • A. A. Ivanova

摘要

Abstract

This paper is the second in a series of papers dedicated to the analysis of spectral and photometric observations of the Herbig Ae/Be star HD 179218. The variations in the H \(\alpha\) and H \(\beta\) line profiles in the star’s spectrum and the variations in its brightness and color indices in the \(UBVRI\) system are investigated. Regular variations of the profiles with periods from 37 to 737 days at a significance level of \(10^{-4}\) were revealed. Two of the found spectral periods agree with the photometric ones within the error limits. The regular spectral and photometric variability we discovered may indicate a presence of a companion or an exoplanet/exoplanets around the star, and may also be associated with the precession of the accretion disk and variation of the accretion rate.