منابع مشابه
On the polarization of φ Persei
Polarimetric data of φ Per from recent observations with the HPOL spectropolarimeter and from an earlier study in the literature have been compared. It is shown that for measurements with accuracies ∆p ∼ 0.003%, temporal changes are readily detected, these seemingly being unrelated to periodic changes in scattering geometry associated with the binary nature of the star. From studies of the p(λ)...
متن کامل53 Persei : a slowly pulsating B star ?
A new investigation of the behaviour of the star 53 Per was performed. New photometric observations allow to confirm twodominant periods p1=2.16 d, p2= 1.67 d.A third one p3= 3.64 d is detected. These long period variations are present in our radial velocities data and in old equivalent width data. The amplitude of the p1 = 2.16 d period increases from 1977 to 1991, while the amplitude of the 1...
متن کاملThe Blazhko Effect of the RR Lyrae Star FM Persei
We have obtained 615 new V and R observations of the RR Lyrae star FM Per. A period search identified a primary period of 0.489256 days; however, the light curve of FM Per cannot be well described by a single period. We conclude that FM Per demonstrates the Blazhko effect with a Blazhko period of approximately 122 days.
متن کاملXMM–Newton observation of the persistent Be/neutron–star system X Persei at a high–luminosity level
We report on the XMM–Newton observation of the HMXRB X Persei, the prototype of the persistent and low– luminosity Be/neutron star pulsars, which was performed on February 2003. The source was detected at a luminosity level of ∼ 1.4 × 10 erg s, which is the highest level of the latest three decades. The pulsation period has increased up to 839.3 s, thus confirming the overall spin–down of the N...
متن کاملOn the warping of Be star discs
The theory of radiatively-induced warps in accretion discs is applied to the discs of Be stars. It is found that these discs may develop warps in their inner regions, although once the warp amplitude is large enough then the interaction between the disc and fast radiatively-driven wind will determine its evolution. The warping is shown to be more important for later than earlier B stars. Althou...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1980
ISSN: 0074-1809
DOI: 10.1017/s0074180900064846