Harmonic generation by ultrarelativistic electrons in a planar undulator and the emission-line broadening

2014 ◽  
Vol 29 (1) ◽  
pp. 132-142 ◽  
Author(s):  
K.V. Zhukovsky
2014 ◽  
Vol 5 (8) ◽  
pp. 1300-1306 ◽  
Author(s):  
Christian Wehrenfennig ◽  
Mingzhen Liu ◽  
Henry J. Snaith ◽  
Michael B. Johnston ◽  
Laura M. Herz

1989 ◽  
Vol 107 ◽  
pp. 373-373
Author(s):  
W. Van Hamme

AbstractWe present light curve solutions for the non-synchronously rotating Algols RW Mon and RW Tau, and we illustrate how rotation rates are determined from light curves. We find RW Mon’s primary component to spin at about 5 times the synchronous rate, which confirms the indication of fast rotation from reported emission line activity. RW Tau turns out to be only a mildly rapidly rotating Algol system, and our light curve solutions do not yield any firm value for the rotation rate of the primary component. It is suggested that continued efforts should be made to do good quality line broadening studies in order to find rotation rates for systems with only modest degrees of rapid rotation, and in order to further test photometric rotation rates against those of line broadening studies.


2017 ◽  
Vol 27 (2) ◽  
pp. 107
Author(s):  
Pham Thi Tuyet Nhung ◽  
Pham Tuan Anh ◽  
Do Thi Hoai ◽  
Pham Ngoc Diep ◽  
Nguyen Thi Phuong ◽  
...  

The CO(3-2) emission of the debris disc of the young A star 49 Ceti, known to be particularly gas rich, has been recently detected and measured using the ALMA interferometer. We study the observed line profile and comment on each of the possible contributions to its width. Line broadening is found to be dominated by Keplerian shear and an upper limit of 0.8 kms FWHM is placed on other possible contributions,including temperature, confirming the quietness of the gas contained in the disc and disfavouring models that would require relatively violent events to generate secondary gas.


2020 ◽  
Vol 124 (36) ◽  
pp. 19809-19816
Author(s):  
Christian Heyn ◽  
Leonardo Ranasinghe ◽  
Michael Zocher ◽  
Wolfgang Hansen

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