Formation of Hydrogen Emission Lines in the Magnetospheres of Young Stars     

Dmitriev  D. V.  Grinin  V. P.  Katysheva  N. A. 《Astronomy Letters》2019,45(6):371-383

Astronomy Letters - The formation of hydrogen emission lines in the magnetospheres of young stars is considered. The magnetosphere is assumed to be formed by a dipolar magnetic field whose axis is...  相似文献   

Results of Photometric and Spectroscopic Observations of the Young Variable Star V730 Cep     

V. P. Grinin  K. A. Antonyuk  I. S. Potravnov  D. Mkrtichian 《Astronomy Letters》2018,44(12):798-802

We present the results of our photometric (V RI) and spectroscopic observations of the young variable star V730 Cep (MisV1147) classified by Uemura et al. (2004) as a Herbig Be star. Our photometry confirms the conclusion of the above authors that this star has a complex pattern of variability including periodic or quasi-periodic brightness variations with a period of about 14 days and deep Algol-like minima typical for UX Ori stars. Our spectroscopy shows that the classification of V730 Cep as a Herbig Be star is wrong. Actually, this star has a much lower temperature and belongs to the family of T Tauri stars. This allows us to explain the nature of the unusual photometric activity of V730 Cep based on a combination of two well-known models of variable circumstellar extinction applied to young stars: AA Tau- and UX Oritype variability. It follows from our observations that the color tracks on the V ?(V ?I) color–magnitude diagram for these models slightly differ: the AA Tau-type variability of circumstellar extinction is caused by larger grains than the UX Ori-type variability. Such a difference can be due to an increase in the characteristic sizes of circumstellar dust as the star is approached and has a simple explanation: small dust grains evaporate faster than large ones.  相似文献   

“The photopolarimetric activity and circumstellar environment of the T tauri star CO ORI”     

A. N. Rostopchina  V. P. Grinin  D. N. Shakhovskoi  A. A. Lomach  N. Kh. Minikulov 《Astronomy Reports》2007,51(10):869

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Formation of emission lines of hydrogen,calcium, and magnesium in expanding envelopes of T Tau stars     

V. P. Grinin  A. S. Mitskevich 《Astrophysics》1990,32(3):216-229

Crimean Astrophysical Observatory. Translated from Astrofizika, Vol. 32, No. 3, pp. 383–404, May–June, 1990.  相似文献   

H 187 - At the Onset of a New Eclipse     

O. Yu. Barsunova  V. P. Grinin  S. G. Sergeev 《Astrophysics》2005,48(4):445-449

CCD photometry data of the T Tauri star H 187 are presented. They show that a new eclipse of this star began at the end of 2004. Since only one eclipse of this star has been observed previously with a duration of 3.5 years, our data indicate that the eclipses of this object are periodic with a period P=4.9 years between eclipses. Thus, in terms of the absolute duration of the eclipses and in terms of their relative length as a fraction of the period, H 187 is one of the most exotic objects in the sky. __________ Translated from Astrofizika, Vol. 48, No. 4, pp. 529–534 (November 2005).  相似文献   

Dust around young stars. Model of envelope of the Ae Herbig star WW Vul     

N. V. Voshchinnikov  V. P. Grinin 《Astrophysics》1991,34(2):84-95

Leningrad State University; Crimean Astrophysical Observatory. Translated from Astrofizika, Vol. 34, No. 2, pp. 181–198, March–April, 1991.  相似文献   

The unique eclipsing system KH 15D: New photometric data     

O. Yu. Barsunova  V. P. Grinin  S. G. Sergeev 《Astrophysics》2005,48(1):1-8

We present results of photometric observations of the young eclipsing system KH 15D made during two observational seasons, 2002–2004. A comparison of our data with the earlier results of Hamilton et al. and Herbst et al. reveals the existence of a multiyear photometric trend in the brightness: over a period of 5 years the brightness of the system in the I_c band decreased by almost 1 stellar magnitude. It is also shown that the systematic variations in the eclipse parameters reported by Herbst et al. continue to the present. The shape of the light curve has not changed significantly and, as before, it is characterized by a slight brightening in the central portion of the eclipses. These results are discussed in the context of current models for KH 15D.Translated from Astrofizika, Vol. 48, No. 1, pp. 5–14 (February 2005).  相似文献   

Study of radiative energy losses in the moving envelopes of T Tau stars     

V. P. Grinin  A. S. Mitskevich 《Astrophysics》1990,32(1):41-51

Crimean Astrophysical Observatory. Translated from Astrofizika, Vol. 32, No. 1, pp. 69–83, January–February, 1990.  相似文献   

Results of Photometric and Polarimetric Observations of the Fuor V1057 Cyg from the Time of an Outburst to the Present     

E. N. Kopatskaya  V. P. Grinin  D. N. Shakhovskoi  O. S. Shulov 《Astrophysics》2002,45(2):143-149

Observations of the brightness, color, and polarization of the fuor V1057 Cyg over more than 30 years are presented and briefly discussed. Variability of the linear polarization was found.  相似文献   

Theory of radiative heat exchange in polytropic atmospheres     

V. P. Grinin 《Astrophysics》1972,8(1):28-38

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