منابع مشابه
Luminous Red Variable Star
We report photometry and spectroscopy of the evolution of Nova Sagittarii 1994 #1 (V4332 Sagittarii) during outburst. We compare the photometric and spectral evolution of this outburst to known classes of outbursts – including classical novae and outbursts occurring on symbiotic stars – and find this object does not conform to any known class of outburst. The closest match to the behavior of th...
متن کاملThe 1978 – 1995 variability of the symbiotic star AG Pegasi in the ultraviolet ?
In this paper we study in detail the variability of the symbiotic nova AG Peg in the IUE range during the period 1978–1995. We find that the luminosity of the hot component decreased steadily from about 1850 L in 1978 to 430 L in 1995 while its effective temperature remained nearly constant, 86500±1300 ◦K . At the same time, themass loss rate decreased by a factor of 4-5 although the ejection v...
متن کاملThe chromosphere of II Pegasi: multi-line modelling of an RS Canum Venaticorum star
We present the first simultaneous multi-line fitting of a semi-empirical atmospheric model with a chromosphere and transition region to the H I and Ca II spectra of an RS CVn star (II Peg). The static component of the Hα emission core, the line profile of Hβ, the apparent absence of Hγ and Hδ, and the emission core profiles of Ca II K and two of the Ca II IR3 lines are all approximately fitted ...
متن کاملRotational modulation of the ultraviolet line fluxes from the RSCVn star II Pegasi
The exceptional in-orbit performance of the International Ultraviolet Explorer (IUE) for more than eighteen years has made it possible to accumulate an invaluable database of ultraviolet observations of a wide variety of objects and, in particular of active stars. Byrne et al. (1998) –hereafter Paper I– have presented a multiwavelength campaign of observations of the RSCVn star II Peg, partiall...
متن کاملRoche tomography of cataclysmic variables – V . A high - latitude star - spot on RU Pegasi
We present Roche tomograms of the secondary star in the dwarf nova system RU Pegasi derived from blue and red arm ISIS data taken on the 4.2-m William Herschel Telescope. We have applied the entropy landscape technique to determine the system parameters and obtained component masses of M1 = 1.06M⊙, M2 = 0.96M⊙, an orbital inclination angle of i = 43, and an optimal systemic velocity of γ = 7km ...
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ژورنال
عنوان ژورنال: Astronomische Nachrichten
سال: 1901
ISSN: 0004-6337,1521-3994
DOI: 10.1002/asna.19011570712