منابع مشابه
The close Be star companion of β Cephei
Context. The prototype of the β Cephei class of pulsating stars, β Cep, rotates relatively slowly, and yet displays episodic Hα emission. Such behaviour is typical of a rapidly rotating, classical Be star. For some time this posed a contradiction to our understanding of the Be phenomena as rapid rotation is thought to be a prerequisite for the characteristic emission phases of Be stars. Recent ...
متن کاملThird Order Effect of Rotation on Stellar Oscillations of a β-Cephei Star
Here the effect of rotation up to third order in the angular velocity of a star on the p, f and g modes is investigated. To do this, the third-order perturbation formalism presented by Soufi et al. (1998) and revised by Karami (2008), was used. I quantify by numerical calculations the effect of rotation on the oscillation frequencies of a uniformly rotating βCephei star with 12 M⊙. For an equat...
متن کاملOn the pulsation parallax of the variable star RR Lyr
We show that a straightforward application of the predicted relation connecting the absolute K magnitude of fundamental RR Lyrae variables to their period and metal content, together with current evolutionary predictions on the mass and luminos-ity of Horizontal Branch stars, supply a distance estimate to the prototype star RR Lyr in close agreement with the recent parallax determination by HST...
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 کاملWater in Emission in the Iso Spectrum of the Early M Supergiant Star Μ Cephei
We report a detection of water in emission in the spectrum of the M2 supergiant star μ Cep (M2Ia) observed by the Short Wavelength Spectrometer (SWS) aboard Infrared Space Observatory (ISO) and now released as the ISO Archives. The emission first appears in the 6 μm region (ν2 fundamental bands), and then in the 40 μm region (pure rotation lines) despite the rather strong dust emission. The int...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1882
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/42.8.384a