Search Publications
Polarimetry of the Protoplanetary Nebula AFGL 2688
Miroshnichenko, A. S.; Klochkova, V. G.; Panchuk, V. E. +1 more
Our spectroscopic (with resolution R=75 000) and spectropolarimetric (R=15 000) observations with the 6-m telescope of the Special Astrophysical Observatory have enabled us to distinguish photospheric and circumstellar features in the optical spectrum of the bipolar protoplanetary nebula AFGL 2688 for the first time. The linear polarization of the…
Analysis of a Solar Eruptive Event on November 4, 2001, Using CORONAS-F/SPIRIT Data
Grechnev, V. V.; Chertok, I. M.; Kuzin, S. V. +5 more
We analyze large-scale solar activity following the eruption of a very powerful, geoeffective coronal mass ejection in the 23rd solar cycle, observed at 175, 284, and 304 Å on November 4, 2001, using data from the CORONAS-F/SPIRIT telescope. In particular, we have shown that the restructuring of the magnetic field above the eruption center was acc…
Chemical Composition of 15 Photometric Analogues of the Sun
Galazutdinov, G. A.; Bikmaev, I. F.; Galeev, A. I. +1 more
The results of a spectroscopic analysis of 15 stars that are photometric analogues of the Sun are reported. The effective temperatures and surface gravities in the stellar atmospheres are derived from published photometric indices and the HIPPARCOS parallaxes. The abundances of 33 elements ranging from lithium to europium are analyzed based on hig…