scholarly journals CCD Speckle Observations of Binary Stars from the Southern Hemisphere. III. Differential Photometry

2001 ◽  
Vol 121 (3) ◽  
pp. 1583-1596 ◽  
Author(s):  
Elliott Horch ◽  
Zoran Ninkov ◽  
Otto G. Franz
1979 ◽  
Vol 46 ◽  
pp. 371-384 ◽  
Author(s):  
J.B. Hearnshaw

RSCVn stars are fully detached binary stars which show intrinsic small amplitude (up to 0.3 amplitude peak-to-peak) light variations, as well as, in most of the known cases, eclipses. The spectra are F to G, IV to V for the hotter component and usually KOIV for the cooler. They are also characterised by abnormally strong H and K emission from the cooler star, or, occasionally, from both components. The orbital and light curve periods are in the range 1 day to 2 weeks. An interesting feature is the migration of the light variations to earlier orbital phase, as the light variation period is shorter than the orbital period by a few parts in 10+4to a few parts in 10+3.


2004 ◽  
Vol 127 (3) ◽  
pp. 1727-1735 ◽  
Author(s):  
Elliott P. Horch ◽  
Reed D. Meyer ◽  
William F. van Altena

2011 ◽  
Author(s):  
V. S. Tamazian ◽  
J. A. Docobo ◽  
Yu. Yu. Balega ◽  
N. D. Melikian ◽  
E. A. Malogolovets ◽  
...  

1992 ◽  
Vol 135 ◽  
pp. 308-310
Author(s):  
J.S.B. Dick ◽  
M.N. Devaney ◽  
D.H.P. Jones ◽  
R.W. ARGYLE

AbstractUsing a short exposure, one dimensional area scanner, a programme of photometry on binary stars with separations <10″ has been initiated; using speckle techniques, photometry of binaries with separations <1″ is possible. We describe the equipment and techniques and present results acquired during commissioning.


1986 ◽  
Vol 118 ◽  
pp. 463-464
Author(s):  
George W. Wolf ◽  
Janet T. Kern

Approximately 375 classification spectra of 130 Southern Hemisphere eclipsing binary stars were obtained between 1978 and 1982 at Mt. John University Observatory, New Zealand using the 0.6 meter reflector, and at Cerro Tololo Inter-American Observatory, Chile using the 0.4, 0.6, 0.9, and 1.0 meter telescopes. The spectra have been classified by one of us (GWW) using a grid of standards obtained on the various spectrographs at each of the observatories. Since many of the spectra were taken during primary and secondary minima, it has been possible in many cases to classify separately each component in the binaries.


2006 ◽  
Vol 131 (6) ◽  
pp. 3008-3015 ◽  
Author(s):  
Elliott P. Horch ◽  
Brian J. Baptista ◽  
Daniel R. Veillette ◽  
Otto G. Franz

1997 ◽  
Vol 114 ◽  
pp. 2117 ◽  
Author(s):  
Elliot P. Horch ◽  
Zoran Ninkov ◽  
Robert W. Slawson

1997 ◽  
Vol 161 ◽  
pp. 611-621
Author(s):  
Guillermo A. Lemarchand ◽  
Fernando R. Colomb ◽  
E. Eduardo Hurrell ◽  
Juan Carlos Olalde

AbstractProject META II, a full sky survey for artificial narrow-band signals, has been conducted from one of the two 30-m radiotelescopes of the Instituto Argentino de Radioastronomía (IAR). The search was performed near the 1420 Mhz line of neutral hydrogen, using a 8.4 million channels Fourier spectrometer of 0.05 Hz resolution and 400 kHz instantaneous bandwidth. The observing frequency was corrected both for motions with respect to three astronomical inertial frames, and for the effect of Earths rotation, which provides a characteristic changing signature for narrow-band signals of extraterrestrial origin. Among the 2 × 1013spectral channels analyzed, 29 extra-statistical narrow-band events were found, exceeding the average threshold of 1.7 × 10−23Wm−2. The strongest signals that survive culling for terrestrial interference lie in or near the galactic plane. A description of the project META II observing scheme and results is made as well as the possible interpretation of the results using the Cordes-Lazio-Sagan model based in interstellar scattering theory.


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