N. Z. Ismailov, M. A. Pogodin, A. F. Kholtygin, H. N. Adigozalzade, O. V. Kozlova, A. A. Ivanova
{"title":"Structural and Kinematic Features of the Gaseous Envelope of the Unusual Herbig Ae Star HD 179218 II. Long-term Spectral and Photometric Variability","authors":"N. Z. Ismailov, M. A. Pogodin, A. F. Kholtygin, H. N. Adigozalzade, O. V. Kozlova, A. A. Ivanova","doi":"10.1134/S1990341324600819","DOIUrl":null,"url":null,"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<span>\\(\\alpha\\)</span> and H<span>\\(\\beta\\)</span> line profiles in the star’s spectrum and the variations in its brightness and color indices in the <span>\\(UBVRI\\)</span> system are investigated. Regular variations of the profiles with periods from 37 to 737 days at a significance level of <span>\\(10^{-4}\\)</span> 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>","PeriodicalId":478,"journal":{"name":"Astrophysical Bulletin","volume":"80 1","pages":"14 - 21"},"PeriodicalIF":1.3000,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Astrophysical Bulletin","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.1134/S1990341324600819","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}
引用次数: 0
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.
期刊介绍：
Astrophysical Bulletin is an international peer reviewed journal that publishes the results of original research in various areas of modern astronomy and astrophysics, including observational and theoretical astrophysics, physics of the Sun, radio astronomy, stellar astronomy, extragalactic astronomy, cosmology, and astronomy methods and instrumentation.
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