منابع مشابه
Emission line variability of RS Ophiuchi ⋆
We report that the Hα emission line of RS Oph was strongly variable during our 2004 observations on a time scale of 1 month. The line consisted of both a double peaked central narrow component (FWHM∼220 km s) and a strongly variable broad one (FWHM>2000 km s). The base of the Hα line was very broad with FWZI≈4600 km s on all spectra from 1986 to 2004. The variability of the broad component exte...
متن کاملMULTIPERIODICITY OF f OPHIUCHI FROM MULTISITE OBSERVATIONS
We present results from simultaneous multisite high-resolution spectroscopic and photometric observations of f Oph (HD 149757) taken in 1993 May. Our spectroscopic data include about 100 hr of continuous monitoring of the star. The line-proÐle variations of He I j6678, which are characterized by features traveling from blue to red, are well reproduced by two large-amplitude sinusoids and other ...
متن کاملISOCAM mapping of the Ophiuchi main cloud
We present preliminary results of the ISOCAM survey of the Ophiuchi main cloud L1688 (0.5 square degrees) conducted in the two broad-band filters LW2 (5-8.5 m) and LW3 (12-18 m). This letter focuses on the properties of the extended emission. ISOCAM observations have revealed several previously unknown characteristics of the mid–IR diffuse emission: the small scale filamentary structure (thickn...
متن کاملAsteroseismology of the visual binary 70 Ophiuchi ⋆
Context. Convection in stars excites resonant acoustic waves. The frequencies of these oscillations depend on the sound speed inside the star, which in turn depends on density, temperature, gas motion, and other properties of the stellar interior. Therefore, analysis of the oscillations provides an unrivaled method to probe the internal structure of a star. Aims. Solar-like oscillations in the ...
متن کاملRS Ophiuchi : Thermonuclear Explosion or Disc Instability ?
Sokoloski et al (2008) have recently reported evidence that the recurrent nova RS Ophi-uchi produced a pair of highly collimated radio jets within days of its 2006 outburst. This suggests that an accretion disc must be present during the outburst. However in the standard picture of recurrent novae as thermonuclear events, any such disc must be expelled from the white dwarf vicinity, as the nucl...
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ژورنال
عنوان ژورنال: Astronomische Nachrichten
سال: 1862
ISSN: 0004-6337,1521-3994
DOI: 10.1002/asna.18620580812