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Extrasolar low-orbit planets: Dissipation of their atmospheres and probable magnetic field
Ksanfomality, L. V.
Analysis of the data obtained during transits of low-orbit extrasolar planets across the stellar disk yields different estimates of their atmospheric loss rates. Experimental data point to the probable existence of several distinct subtypes of extrasolar giant planets, including "hot Jupiters" of low density (HD 209458b), with massive cores compos…
Cosmic GRB 060428C detected in the field of view of the IBIS and SPI telescopes onboard the INTEGRAL observatory and its early afterglow
Grebenev, S. A.; Chelovekov, I. V.
While analyzing the archival data of the INTEGRAL observatory, we detected and localized a cosmic gamma-ray burst recorded on April 28, 2006, by the IBIS/ISGRI and SPI telescopes in their fields of view. Since the burst was not revealed by the INTEGRAL burst alert system (IBAS), information about its coordinates was not distributed in time and no …
Development dynamics of intense solar proton flares
Zimovets, I. V.; Struminsky, A. B.
We consider the relationship of electromagnetic radiation in the three most intense flares of solar cycle 23, more specifically, those of October 28, 2003, January 20, 2005, and September 7, 2005, to the acceleration and release of protons into interplanetary space. The impulsive phase of these flares lasted ∼ 20 min and consisted of at least thre…
INTEGRAL observations of the gamma-ray burst on March 11, 2007
Sunyaev, R. A.; Sazonov, S. Yu.; Molkov, S. V.
On March 11, 2007, the INTEGRAL observation discovered and localized a gamma-ray burst in the sky from which an early infrared afterglow was then detected. We present our timing and spectral analyses of the data from the ISGRI detector of the IBIS telescope. The burst consists of one ∼40-s-long peak during which a fluence of ∼3 × 10-6 e…
Red giants in the blue compact galaxy IZw18
Tikhonov, N. A.
Archival Hubble Space Telescope (HST) data have been used for the photometry of stars in blue compact dwarf (BCD) galaxies of the IZw18 system. Applying the spatial selection of stars, we have detected red giants, stars older than 1 2 Gyr, in the galaxies. These red giants have allowed the distance to IZw18 to be reliably determined for the first …