Rossiter-mclaughlin effect in emission from UX Ori stars     

V. P. Grinin  I. S. Potravnov 《Astrophysics》2013,56(1):1-7

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Variability of the hydrogen and calcium emission in the spectrum of SU Aur     

V. P. Grinin  A. S. Mitskevich  L. V. Timoshenko 《Astrophysics》1985,22(1):24-28

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Photometric and polarimetric activity of RZ Psc     

D. N. Shakhovskoi  V. P. Grinin  A. N. Rostopchina 《Astronomy Reports》2003,47(7):580-586

We present the results of synchronous photometric and polarimetric U BV RI observations of the irregular variable star RZ Psc, acquired at the Crimean Astrophysical Observatory in 1989–2002. The star’s photometric behavior is characterized by short, sporadic Algol-like dimmings. We observed only one deep minimum, with a V amplitude of about 1.5^m, during the entire observation time. During this minimum, the star’s linear polarization reached 3.5%. Comparisons with polarization observations of RZ Psc during another deep minimum in 1989 show that the two minima can be described by the same polarization-brightness relation, testifying to an eclipsing nature for the minima. This provides evidence that the optical characteristics of the flattened circumstellar dust envelope that gives rise to the star’s intrinsic polarization have remained virtually unchanged over the last 13 years. We argue that the origin of this stability is the presence of a large dust-free cavity in the central region of the circumstellar dust disk of RZ Psc. The cavity could be associated with binarity of the star or the formation of a planetary system, with most of the dust in the central region of the disk being transformed into large bodies—planetesimals and planets.  相似文献   

Photometric and polarimetric activity of the Herbig Ae star VX Cas     

D. N. Shakhovskoi  A. N. Rostopchina  V. P. Grinin  N. Kh. Minikulov 《Astronomy Reports》2003,47(4):301-311

We present the results of our simultaneous photometric and polarimetric observations of the Herbig Ae/Be star VX Cas acquired in 1987–2001. The star belongs to the UX Ori subtype of young variable stars and exhibits a rather low level of photometric activity: only six Algol-like minima with amplitudes ΔV>1^m were recorded in 15 years of observations. Two of these minima, in 1998 and 2001, were the deepest in the history of the star’s photometric studies, with V amplitudes of about 2^m. In each case, the dimming was accompanied by an increase in the linear polarization in agreement with the law expected for variable circumstellar extinction. The highest V polarization was about 5%. Observations of VX Cas in the deep minima revealed a turnover of the color tracks, typical of stars of this type and due to an increased contribution from radiation scattered in the circumstellar disk. We separated the observed polarization of VX Cas into interstellar (P_is) and intrinsic (P_in) components. Their position angles differ by approximately 60°, with P_is dominating in the bright state and P_in dominating during the deep minima. The competition of these two polarization components leads to changes in both the degree and position angle of the polarization during the star’s brightness variations. Generally speaking, in terms of the behavior of the brightness, color indices, and linear polarization, VX Cas is similar to other UX Ori stars studied by us earlier. A number of episodes of photometric and polarimetric activity suggest that, in their motion along highly eccentric orbits, circumstellar gas and dust clouds can enter the close vicinity of the star (and be disrupted there).  相似文献   

Heating of gas in stellar flares. I. Heating by protons     

V. P. Grinin  V. V. Sobolev 《Astrophysics》1989,31(3):729-735

Crimean Astrophysical Observatory; Leningrad State University. Translated from Astrofizika, Vol. 31, No. 3, pp. 527–537, November–December, 1989.  相似文献   

Transfer of resonance radiation in moving media with nonlocal radiative coupling     

V. P. Grinin 《Astrophysics》1978,14(2):113-121

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Relative intensities of hydrogen lines in the spectra of nebulas     

V. P. Grinin 《Astrophysics》1969,5(2):101-104

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Polarization of radiation of flare stars     

V. P. Grinin  H. Domke 《Astrophysics》1971,7(2):120-126

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Photometric activity of UX orionis stars and related objects in the near infrared and optical: CO Ori,RR Tau,UX Ori,and VV Ser     

V. I. Shenavrin  A. N. Rostopchina-Shakhovskaya  V. P. Grinin  T. V. Demidova  D. N. Shakhovskoi  S. P. Belan 《Astronomy Reports》2016,60(8):753-767

This paper continues a study of the photometric activity of UX Ori stars in the optical and near-infrared (JHKLM bands) initiated in 2000. For comparison, the list of program stars contains two Herbig Ae stars that are photometrically quiet in the optical: MWC480 andHD179218. Fadings ofUXOri stars in the optical (V band) due to sporadic increases of the circumstellar extinction are also observed in the infrared (IR), but with decreasing amplitude. Two stars, RR Tau and UX Ori, displayed photometric events when V -band fadings were accompanied by an increase in IR fluxes. Among the two Herbig Ae stars that are photometrically quiet in the optical, MWC 480 proved to be fairly active in the IR. Unlike the UX Ori stars, the variation amplitude of MWC 480 increases from the J band to the M band. In the course of the observations, no deep fadings in the IR bands were detected. This indicates that eclipses of the program stars have a local nature, and are due to extinction variations in the innermost regions of the circumstellar disks. The results presented testify to an important role of the alignment of the circumstellar disks relative to the direction towards the observer in determining the observed IR variability of young stars.  相似文献   

Correction to: Radiation and Thermodynamic Characteristics of Hydrogen Gas Near the State of Thermalization     

N. A. Katysheva  T. A. Ermolaeva  V. P. Grinin 《Astrophysics》2018,61(2):286-286

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