Zobrazeno 1 - 10
of 21
pro vyhledávání: '"Klochkova, Valentina G."'
High-resolution optical spectra of the B[e] star CI Cam were obtained on arbitrary dates 2002-2023 using the echelle spectrograph NES of the 6-m BTA telescope. The temporal variability of the powerful emissions of H$\alpha$ and HeI profiles is found.
Externí odkaz:
http://arxiv.org/abs/2408.09804
Publikováno v:
Astronomy Reports, vol 67, No 12, p 1381-1393 (2023)
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,
Externí odkaz:
http://arxiv.org/abs/2402.09061
Autor:
Kraus, Michaela, Kolka, Indrek, Aret, Anna, Nickeler, Dieter H., Maravelias, Grigoris, Eenmäe, Tõnis, Lobel, Alex, Klochkova, Valentina G.
Yellow hypergiants are evolved massive stars that were suggested to be in post-red supergiant stage. Post-red supergiants that evolve back to the blue, hot side of the Hertzsprung-Russell diagram can intersect a temperature domain in which their atmo
Externí odkaz:
http://arxiv.org/abs/1812.03065
We have derived elemental abundances of a remarkable star, HD 179821, with unusual composition (e.g. [Na/Fe]=1.0$\pm$0.2 dex) and extra-ordinary spectral characteristics. Its metallicity at [Fe/H]=0.4 dex places it among the most metal-rich stars yet
Externí odkaz:
http://arxiv.org/abs/1607.00142
An abundance analysis is presented for IRAS 18095+2704 (V887 Her), a post-AGB star and proto-planetary nebula. The analysis is based on high-resolution optical spectra from the McDonald Observatory and the Special Astrophysical Observatory. Standard
Externí odkaz:
http://arxiv.org/abs/1008.0358
Autor:
Kipper Tõnu, Klochkova Valentina G.
Publikováno v:
Open Astronomy, Vol 22, Iss 2, Pp 77-99 (2013)
We analyzed some new high resolution optical spectra of the semiregular RV Tauri-type star R Sct. Fundamental parameters were found to be Teff = 4500 K, log g = 0.0 and ξt = 4.0 km s−1. The results of chemical analysis show that R Sct is a metal-p
Externí odkaz:
https://doaj.org/article/7a00b85f0b934fc58627b2dd3399c964
Autor:
Kipper Tõnu, Klochkova Valentina G.
Publikováno v:
Open Astronomy, Vol 21, Iss 3, Pp 219-240 (2012)
The high resolution spectra of hydrogen-deficient binary υ Sgr are analyzed. The atmospheric parameters are Teff = 12300±200 K, log g = 2:5±0:5 and ξt = 5 - 15 kms−1 depending on the element. For Fe II ξt = 9:3 ± 0:3 kms−1. Iron is slightly
Externí odkaz:
https://doaj.org/article/09156caf6bf141619664b6d7550b99b2
Autor:
Miroshnichenko, Anatoly S., Zharikov, Sergei V., Manset, Nadine, Khokhlov, Serik A., Nodyarov, Atilkhan S., Klochkova, Valentina G., Danford, Stephen, Kuratova, Aizhan K., Mennickent, Ronald, Chojnowski, S. Drew, Raj, Ashish, Bisht, Devendra
Publikováno v:
Galaxies (2075-4434); Feb2023, Vol. 11 Issue 1, p36, 19p
Akademický článek
Tento výsledek nelze pro nepřihlášené uživatele zobrazit.
K zobrazení výsledku je třeba se přihlásit.
K zobrazení výsledku je třeba se přihlásit.
Akademický článek
Tento výsledek nelze pro nepřihlášené uživatele zobrazit.
K zobrazení výsledku je třeba se přihlásit.
K zobrazení výsledku je třeba se přihlásit.