High resolution optical spectra of the dormant LBV star P Cyg
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arXiv
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2024
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| author | Klochkova, Valentina G. Panchuk, Vladimir E. Tavolzhanskaya, Nonna S. |
| author_facet | Klochkova, Valentina G. Panchuk, Vladimir E. Tavolzhanskaya, Nonna S. |
| contents | High resolution optical spectra (R = 60 000) of the LBV star P Cyg beyond outburst were obtained on the 6-meter BTA telescope in the wavelength range 477-780 nm. We perform a detailed identification of different types lines (photospheric absorptions, permitted and forbidden emissions, components of lines with P Cyg type profiles), and studied the variability of their profiles and radial velocities. The average radial velocity from positions of forbidden emissions ([NII] 5754.64, [FeII] 5261.62, [FeII] 7155.14 and [NiII] 7377.83 Å) is accepted as the system velocity Vsys=$-34\pm1.4$ km/s. About a dozen photospheric absorptions of CNO triad ions and SiIII are found, their stable position, Vr(abs)=$-73.8$ km/s, shifted relative to at $-40$ km/s, indicates that these absorbtions are formed in the pseudophotosphere region. The high-excitation emissions ([OI] 5577, 6300, 6363 Å, [OIII] 4959 and 5007 Å, as well as HeII 4686 Å) are absent in the spectra. The radial velocity Vr(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 NaI and KI forming in the galactic Perseus arm. A color excess E(B-V)=0.34+/-0.03 mag and interstellar absorption Av=1.09 mag were determined by measurements of equivalent widths of nine DIBs. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_09061 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | High resolution optical spectra of the dormant LBV star P Cyg Klochkova, Valentina G. Panchuk, Vladimir E. Tavolzhanskaya, Nonna S. Solar and Stellar Astrophysics High resolution optical spectra (R = 60 000) of the LBV star P Cyg beyond outburst were obtained on the 6-meter BTA telescope in the wavelength range 477-780 nm. We perform a detailed identification of different types lines (photospheric absorptions, permitted and forbidden emissions, components of lines with P Cyg type profiles), and studied the variability of their profiles and radial velocities. The average radial velocity from positions of forbidden emissions ([NII] 5754.64, [FeII] 5261.62, [FeII] 7155.14 and [NiII] 7377.83 Å) is accepted as the system velocity Vsys=$-34\pm1.4$ km/s. About a dozen photospheric absorptions of CNO triad ions and SiIII are found, their stable position, Vr(abs)=$-73.8$ km/s, shifted relative to at $-40$ km/s, indicates that these absorbtions are formed in the pseudophotosphere region. The high-excitation emissions ([OI] 5577, 6300, 6363 Å, [OIII] 4959 and 5007 Å, as well as HeII 4686 Å) are absent in the spectra. The radial velocity Vr(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 NaI and KI forming in the galactic Perseus arm. A color excess E(B-V)=0.34+/-0.03 mag and interstellar absorption Av=1.09 mag were determined by measurements of equivalent widths of nine DIBs. |
| title | High resolution optical spectra of the dormant LBV star P Cyg |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2402.09061 |