Spectroscopic Peculiarity of the Herbig Be Star HD 259431

M. Pogodin, S.E. Pavlovskij, Наталия Алексеевна Драке, N.G. Beskrovnaya, O.V. Kozlova, I.Yu. Alekseev, M. Borges Fernandes, C.B. Pereira, G. Valyavin

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High-resolution spectra of the Herbig Be star HD 259431 obtained in 2010-2016 at three observatories (Crimean AO, ESO in Chile, and OAN SPN in Mexico) are analysed. The object demonstrates a very rich emission line profile spectrum. The bulk of the lines exhibit double-peaked emission profiles and originate in the gaseous disk. The atmospheric lines are unusually shallow, and majority of them are distorted by the circumstellar (CS) contribution. Moreover, we have revealed that they are overlapped with an additional continuum emission. Using the observed ratio of the equivalent widths of two He I λ 4009 and 4026 lines, we estimated the spectral type of the object as B5 V. We also constructed the spectral energy distribution of the additional continuum using wide wings of the atmospheric Hβ-Hɛ lines free of the CS contribution. The continuum corresponds to the blue part of the black body spectrum. The Hβ - Hɛ Balmer emission lines show very variable profiles looking as either of P Cyg-type or a double-peaked emission line with a depression of the red wing. We found the period of this variability P = 2.630d and interpreted it as a sign of a rotating magnetosphere of the star with the magnetic axis inclined to the rotation axis. At different phases of rotation, the observer can see either an accretion flow at high magnetic latitudes or a wind zone at lower latitudes. We also estimated the inclination of the rotation axis i = 52°±1°.
Translated title of the contributionСпектроскопическая пекулярность звезды Ве Хербига HD 259431
Original languageEnglish
Title of host publicationStars: From Collapse to Collapse
Subtitle of host publicationProceedings of a conference held at Special Astrophysical Observatory, Nizhny Arkhyz, Russia 3-7 October 2016
EditorsYu.Yu Balega, D.O. Kudryavtsev
Place of PublicationSan Francisco
Number of pages5
EditionAstronomical Society of the Pacific
StatePublished - 10 Jun 2017
EventStars: From Collapse to Collapse - Специальная Астрофизическая Обсерватория, Нижний Архыз, Russian Federation
Duration: 3 Oct 20167 Oct 2016


ConferenceStars: From Collapse to Collapse
CountryRussian Federation
CityНижний Архыз
Internet address

Scopus subject areas

  • Astronomy and Astrophysics

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