scholarly journals Improved Data Reduction Techniques for the ESO CES Plus Reticon Spectra

1988 ◽  
Vol 132 ◽  
pp. 355-360
Author(s):  
B. H. Foing ◽  
L. Crivellari
Keyword(s):  
Radial Velocity ◽  
Data Reduction ◽  
Equivalent Width ◽  
Optimal Recovery ◽  
Special Care ◽  
Velocity Measurements ◽  
Reduction Techniques ◽  
Dark Counts ◽  
Improved Data Reduction

We developed routines for intensity, equivalent width, and radial velocity measurements on CES plus reticon spectra obtained with the ESO 1.4m telescope. In order to achieve the optimal recovery of the signal, the noise has to be minimized by removing any parasitical effect. Special care has been devoted to the correction for remanence effects in the reticon dark counts. Typical results are presented and discussed.

scholarly journals Precise Radial-velocity Measurements with a Cassegrain Spectrograph, II: Radial-velocity Determination and Applications

1999 ◽  
Vol 170 ◽  
pp. 68-72 ◽  
Author(s):  
I. V. Ilyin ◽  
R. Duemmler
Keyword(s):  
Radial Velocity ◽  
Data Reduction ◽  
High Accuracy ◽  
Radial Velocities ◽  
Velocity Measurements ◽  
Echelle Spectrograph ◽  
The Stability ◽  
Stability Issues

AbstractWe present our measurements of radial velocities of two stars suspected to have a substellar companion by using observations made with a cassegrain échelle spectrograph. The stability issues and details of the data reduction are discussed in Ilyin & Duemmler (paper I, these proceedings). The results obtained here show that relatively high accuracy of radial velocity determinations is also attainable for cassegrain spectrographs.

Laser Velocimeter Measurements in a Model Propeller Flowfield

1988 ◽  
Vol 110 (4) ◽  
pp. 350-354 ◽  
Author(s):  
J. Lepicovsky
Keyword(s):  
Data Acquisition ◽  
Data Reduction ◽  
Velocity Measurements ◽  
Simple Experiment ◽  
Reversed Flow ◽  
Mean Velocity ◽  
Blade Height ◽  
Reduction Techniques ◽  
The Mean ◽  
Set Up

The objective of this work was to demonstrate the usability of a laser velocimeter data acquisition and reduction techniques for ensemble-averaged velocity measurements near and between rotating propeller or fan blades. A relatively simple experiment was set up to measure the flowfield of a two-bladed model propeller operating at static (non-flight) conditions to verify the data reduction procedures. The mean velocity and ensemble-averaged blade-to-blade velocity distributions were acquired. The experimental results, plotted in a novel consise form, showed separated and reversed flow regions on a rotating static propeller. The flowfield distortion along the blade height in the vicinity of the propeller disc was also observed.

Flight Test Execution and Data Reduction Techniques of Exhaust Gas Reingestion on the CH-53K King Stallion

2021 ◽  
Author(s):  
Noopur Joshi ◽  
Noah Becker ◽  
Roger Tull ◽  
James Kenna ◽  
Christopher Adams ◽  
...  
Keyword(s):  
Data Reduction ◽  
Flight Test ◽  
Exhaust Gas ◽  
Test Execution ◽  
Reduction Techniques

scholarly journals Precision stellar radial velocity measurements with FIDEOS at the ESO 1-m telescope of La Silla

2018 ◽  
Vol 477 (4) ◽  
pp. 5041-5051 ◽  
Author(s):  
L Vanzi ◽  
A Zapata ◽  
M Flores ◽  
R Brahm ◽  
M Tala Pinto ◽  
...  
Keyword(s):  
Radial Velocity ◽  
Velocity Measurements

scholarly journals Spectroscopic Orbit of the Eclipsing Binary BD +52°2009

1999 ◽  
Vol 170 ◽  
pp. 325-330
Author(s):  
B. Khalesseh
Keyword(s):  
Correlation Function ◽  
Light Curve ◽  
Radial Velocity ◽  
Physical Model ◽  
Cross Correlation ◽  
Cross Correlation Function ◽  
Physical Parameters ◽  
Mass Ratio ◽  
Velocity Measurements ◽  
Eclipsing Binary

AbstractNew radial velocity measurements of the Algol-type eclipsing binary BD +52 °2009, based on Reticon observations, are presented. The velocity measures are based on fitting theoretical profiles, generated by a physical model of the binary, to the observed cross-correlation function (ccf). Such profiles match this function very well, much better in fact than Gaussian profiles, which are generally used. Measuring the ccf’s with Gaussian profiles yields the following results: mp sin3i = 2.55 ± 0.05m⊙, ms sin3i = 1.14 ± 0.03m⊙, (ap + as) sin i = 7.34 ± 0.05R⊙, and mp/ms = 2.23 ± 0.05. However, measuring the ccf’s with theoretical profiles yields a mass ratio of 2.33 and following results: mp sin3i = 2.84 ± 0.05m⊙, ms sin3i = 1.22 ± 0.03m⊙, (ap + as) sin i = 7.56 ± 0.05R⊙. The system has a semi-detached configuration. By combining the solution of a previously published light curve with the spectroscopic orbit, one can obtain the following physical parameters: mp = 2.99m⊙, ms3 = 1.28m⊙, < Tp >= 9600K, < Ts >= 5400K, < Rp >= 2.35R⊙, < Rs >= 2.12R⊙. The system consists of an A0 primary and a G2 secondary.

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