Doppler tomography of the circumstellar disk of {\pi} Aquarii
| Autor: | T. Garrel, O. Garde, Karen S. Bjorkman, G. Martineau, A. Favaro, J. N. Terry, C. Buil, Anatoly S. Miroshnichenko, H. Kalbermatten, Nancy D. Morrison, T. Blank, S. V. Zharikov, V. Desnoux, E. Pollmann, B. Mauclaire, J. Guarro Flo, Y. Buchet, S. Danford, S. Ubaud, C. J. Sawicki |
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| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: | |
| Popis: | The work is aimed at a study of the circumstellar disk of the bright classical binary Be star {\pi} Aqr. We analysed variations of a double-peaked profile of the H{\alpha} emission line in the spectrum of {\pi} Aqr that was observed in many phases during ~40 orbital cycles in 2004--2013. We applied the Discrete Fourier Transform (DFT) method to search for periodicity in the peak intensity (V/R) ratio. Doppler tomography was used to study the structure of the disk around the primary. The dominant frequency in the power spectrum of the H{\alpha} V/R ratio is 0.011873 day^-1 that correspond to a period of 84.2(2) days and is in agreement with the earlier determined orbital period of the system, Porb=84.1 days. The V/R ratio shows a sinusoidal variation phase-locked with the orbital period. Doppler maps of all our spectra show a non-uniform structure of the disk around the primary: a ring with the inner and outer radii at Vin~ 450 km/s and Vout~ 200km/s, respectively, along with an extended stable region (spot) at V_x ~ 225 km/s and V_y~100 km/s. The disk radius of ~ 65 Rsun = 0.33 AU was estimated assuming Keplerian motion of a particle on a circular orbit at the disk outer edge. Comment: 11 pages, 7 figures, 2 tables, published in A&A |
| Databáze: | OpenAIRE |
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