منابع مشابه
High Resolution Radio Images of the Symbiotic Star R Aquarii
We present MERLIN radio observations of the nearby symbiotic star R Aquarii at 5 and 1.7 GHz with respective nominal resolutions of 0:04 and 0.13 arcsec, comparable to the resolution of the optical and ultraviolet images obtained with the HST. Comparison with the HST images shows that the radio emission is associated with features observed at optical and UV wavelengths. In particular, this comp...
متن کاملDissecting the donor star in the eclipsing polar HU Aquarii
Medium-resolution spectroscopic observations with full phase coverage of the eclipsing polar HU Aqr are presented. Na i absorption and Ca ii emission lines are used to trace the secondary star. While the Na i lines seem to have contributions from both hemispheres of the donor star, the Ca ii lines were found to originate from the irradiated part of its surface alone. An irradiation model was ap...
متن کاملLuminous 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 کاملAquarii : how CVs descend from supersoft binaries
AE Aquarii is a propeller system. It has the shortest spin period among cataclysmic variables, and this is increasing on a 10 yr timescale. Its UV spectrum shows very strong carbon depletion vs nitrogen and its secondary mass indicates a star far from the zero–age main sequence. We show that these properties strongly suggest that AE Aqr has descended from a supersoft X–ray binary. We calculate ...
متن کاملThe MACHO Project LMC Variable Star Inventory : IV . New R Coronae Borealis
We report the discovery of two new R Coronae Borealis (RCB) stars in the Large Magellanic Cloud (LMC) using the MACHO project photometry database. The identiication of both stars has been connrmed spectroscopically. One is a cool RCB star (T eff 5000 K) characterized by very strong Swan bands of C 2 and violet bands of CN, and weak or absent Balmer lines, G-band and 12 C 13 C bands. The second ...
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ژورنال
عنوان ژورنال: Astronomische Nachrichten
سال: 1908
ISSN: 0004-6337,1521-3994
DOI: 10.1002/asna.19081791007