http://hdl.handle.net/20.500.12323/5762 2026-04-18T21:18:05Z http://hdl.handle.net/20.500.12323/5767 Title: Spectroscopy and Photometry of MWC 137 Authors: Alimardanova, F.; Miroshnichenko, A. S.; Zharikov, S. V.; Rudy, R. J.; Manset, N.; Kusakin, A. V.; Kuratov, K. S.; Khokhlov, S. Abstract: MWC 137 is an object with a strong emission-line spectrum associated with an 1'-size H Imall> region Sharpless 266. It was included in a catalog of planetary nebulae in 1967, in the first list of objects with the B[e] phenomenon in 1976, and in a list of Herbig Ae/Be stars in 1984. A recent analysis of the stellar and nebular spectra of MWC 137 by several authors suggested that it is most likely a B[e] supergiant located at a distance 4-6 kpc away from the Sun. No high-resolution spectra of the object have been published so far. We present the results of our analysis of high-resolution optical spectra of MWC 137 obtained in 2004-2016 and UBVRI photometry. 2017-01-01T00:00:00Z http://hdl.handle.net/20.500.12323/5766 Title: Ultraviolet Spectrum Variability of BP TAU Authors: Ismailov, N.Z.; Alimardanova, F.N.; Baheddinova, G.R.; Adygezalzade, H.N. Abstract: Results of the ultraviolet IUE archive spectrum researches of classic T Tauri type star BP Tau had been presented. Spectroscopic parameters of mainly strong emission lines were measured. On the more full massive which had been created on the intensity values of the emission doublet MgII 2800 A a variability with period P = 8:275 0:005 days with high con dence level was obtained. There is some group of lines, intensities of emission lines for which were showed decreasing for more than 13 years of time interval. As a rule, lines with high potential of excitation related to the rst group. More probable, such lines shows periodic variability. It is showed that we have as a minimum two local physical conditions of matter in the circumstellar disk of the star. 2010-01-01T00:00:00Z http://hdl.handle.net/20.500.12323/5765 Title: Распределение энергии в спектрах молодых звезд в области 0.36-100 МКМ Abstract: Используя широкополосные наземные и внеатмосферные инфракрасные (ИК) фотометрические наблюдения изучено распределение энергии в спектрах (РЭС) 87 молодых звезд в интервале 0.36-100 мкм. Изученные объекты показали всего 5 типов кривых РЭС. Была расширена ранее предложенная схема классификации РЭС у молодых звезд по их ИК спектрам. У отдельных звезд наблюдается до 4участков с избыточным излучением в спектре, что может быть объяснено существованием в системедополнительных источников теплового излучения.Наиболее вероятные температуры дополнительных источников в системе соответствуют ~ 1500-2500 °К и 90-120 °К. 2008-01-01T00:00:00Z http://hdl.handle.net/20.500.12323/5764 Title: Long-Term Photometric and Spectral Variations of DI Cephei Authors: Ismailov, N. Z.; Grankin, Konstantin Nikolaevich; Efendieva, F. Abstract: We have analyzed the photometric and spectral variations of the classical T Tauri star DI Cep for the last 50 years. Currently the star is at its faintest state and possesses an emission spectrum in the visual range. Synchronous spectroscopy and UBV R photometry show that the higher the brightness, the stronger were the intensities of hydrogen Hα, Hβ emission lines and of FeII, HeI λ5876 ˚A emissions. For the first time, we detected, with a high probability, quasi-periodic variations of the star’s brightness and of its spectrum with the period P = 2020 ± 200 days. 2008-04-01T00:00:00Z