HIGH RESOLUTION OPTICAL SPECTRA OF THE DORMANT LBV STAR P Cyg
- Authors: Klochkova V.G.1, Panchuk V.E.1, Tavolzhanskaya N.S.1
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Affiliations:
- Special Astrophysical Observatory RAS
- Issue: Vol 100, No 12 (2023)
- Pages: 1245-1258
- Section: Articles
- URL: https://journals.rcsi.science/0004-6299/article/view/233465
- DOI: https://doi.org/10.31857/S0004629923120046
- EDN: https://elibrary.ru/CYKTJG
- ID: 233465
Cite item
Abstract
High resolution optical spectra (R = 60 000) of the dormant LBV star P Cyg were obtained on the BTA telescope in the wavelength range \(\Delta \lambda G7 = 780\) nm. After performing a detailed identification of different types lines (photospheric absorptions, permitted and forbidden emissions, components of lines with profiles of type P Cyg), we studied the variability of their profiles and patterns of radial velocities. The average radial velocity from positions of forbidden emissions ([N II] 5754.64, [Fe II] 5261.62, [Fe II] 7155.14 and [Ni II] 7377.83 Å) is accepted as the system \({{V}_{{{\text{sys}}}}} = - 34 \pm 1.4\) km/s. About a dozen photospheric absorptions of CNO-triad ions and Si III are found, their stable position, \({{V}_{r}}({\text{abs}}) = - 73.8\) km/s, shifted relative to \({{V}_{{{\text{sys}}}}}\) at \( - 40\) km/s, indicates that these absorbtions are formed in the pseudophotosphere region. The high-excitation emissions ([O I] 5577, 6300, 6363 Å, [O III] 4959 and 5007 Å, as well as He II 4686 Å) are absent in the spectra. The radial velocity \({{V}_{r}}({\text{DIBs}}) = - 11.8\) km/s according to the position of numerous DIBs is consistent with the position of the interstellar components of the D-lines Na I and K I forming in the galactic Perseus arm. An excess of color \(E(B - V) = 0.34 \pm {{0.03}^{m}}\) and interstellar absorption \({{A}_{v}}{{ = 1.09}^{m}}\) were determined by measurements of equivalent widths of nine DIBs.
Keywords
About the authors
V. G. Klochkova
Special Astrophysical Observatory RAS
Author for correspondence.
Email: Valentina.R11@yandex.ru
Russia, Nizhnij Arkhyz
V. E. Panchuk
Special Astrophysical Observatory RAS
Email: Valentina.R11@yandex.ru
Russia, Nizhnij Arkhyz
N. S. Tavolzhanskaya
Special Astrophysical Observatory RAS
Email: Valentina.R11@yandex.ru
Russia, Nizhnij Arkhyz
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