DSpace Community: Associate professor, PhD, Dean of the School of Science and Engineering
http://hdl.handle.net/20.500.12323/5761
Associate professor, PhD, Dean of the School of Science and Engineering2024-03-29T14:12:05ZSpectroscopy and Photometry of MWC 137
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.2017-01-01T00:00:00ZUltraviolet Spectrum Variability of BP TAU
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.2010-01-01T00:00:00ZРаспределение энергии в спектрах молодых звезд в области 0.36-100 МКМ
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.2008-01-01T00:00:00ZLong-Term Photometric and Spectral Variations of DI Cephei
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