scholarly journals 26. Commission des Étoiles Doubles

1936 ◽  
Vol 5 ◽  
pp. 166-167
Author(s):  
M. E. Hertzsprung ◽  
MM. Aitken ◽  
Dawson ◽  
Finsen ◽  
Giacobini ◽  
...  
Keyword(s):  
Double Star ◽  
Double Stars ◽  
First Results ◽  
Work Done ◽  
Made In

As double stars too close for photography must be discovered, before they can be observed, it is only natural to start a report about the progress made in double star astronomy during the last 3 years by mentioning the work done by Dr R. A. Rossiter with the Lamont 27-inch refractor at Bloemfontein. The first results have been published in a Ust numbering 2234 new pairs. Approximate positions are given, but as yet no measures are reported. These pairs are distributed as follows between different Umits of distance. For comparison the corresponding numbers for the 1900 discoveries, previously made by Dr W. H. van den Bos, are added.

scholarly journals HIPPARCOS First Results in the Double Star Photometry

1992 ◽  
Vol 135 ◽  
pp. 421-428
Author(s):  
F. Mignard ◽  
J.L. Falin ◽  
M. Froeschlé
Keyword(s):  
Double Star ◽  
Multiple Systems ◽  
Double Stars ◽  
Multiple Stars ◽  
Accuracy And Precision ◽  
First Results ◽  
Main Detector ◽  
Input Catalogue ◽  
Magnitude Difference ◽  
Better Than

AbstractIn addition to its astrometric capabilities the HIPPARCOS main detector proves to be a good phototometer. The main features of the photometric reduction applied to double stars are outlined. We show how it is possible to discriminate single stars from multiple stars from the photometric signal. Results presented are based on about 16000 stars recognized as non-single, of which 8000 were not known to be double in the HIPPARCOS Input Catalogue. Magnitudes for multiple systems as a whole are derived with a precision usually better than 0.005 mag while the magnitude of each component is recovered up to magnitude difference of 3 mag, but with less accuracy and precision.

scholarly journals HIPPARCOS First Results in the Double Star Processing by the FAST Consortium

1992 ◽  
Vol 135 ◽  
pp. 403-411
Author(s):  
F. Mignard ◽  
M. Badiali ◽  
P.L. Bernacca ◽  
H. Bernstein ◽  
D. Cardini ◽  
...  
Keyword(s):  
Position Angle ◽  
Double Star ◽  
Double Stars ◽  
Multiple Stars ◽  
Relative Coordinates ◽  
First Results ◽  
Double And Multiple Stars ◽  
Quantitative Results ◽  
One Year

AbstractAfter the processing of one year of observations carried out by HIPPARCOS it is possible to provide quantitative results as to the number of new double and multiple stars to be detected and the real capacity of this mission to perform relative astrometry on double stars. We present and discuss the methods developed to this end and include the first results concerning the detection statistics and the determination of separation and position angle for double stars. About 16,000 stars have been recognized as non-single, including 9,000 already known as double and mutliple before the mission. Also, a subset of 10,500 stars have been successfully solved for their relative coordinates with an accuracy in the range of 3 to 10 mas.

AMS 14C Dating of Materials Recovered from the Tunnel under the Temple of the Feathered Serpent in Teotihuacan, Mexico

Radiocarbon ◽  
2016 ◽  
Vol 59 (2) ◽  
pp. 545-557 ◽  
Author(s):  
S Gómez-Chávez ◽  
C Solís ◽  
J Gazzola ◽  
E R Chávez-Lomelí ◽  
M A Mondragón ◽  
...  
Keyword(s):  
14C Dating ◽  
Ams Radiocarbon Dating ◽  
Archaeological Data ◽  
First Results ◽  
Ceramic Typology ◽  
Work Done ◽  
The Temple ◽  
Teotihuacan Mexico ◽  
Ams 14C Dating ◽  
Made In

AbstractIn 2003, flooding occurred in the Ciudadela (Citadel) of Teotihuacan and saltpeter began to damage the Temple of the Feathered Serpent. Work done to solve this problem led to one of the most important archaeological discoveries made in this site in recent years: an intact tunnel sealed for more than a thousand years. The project created to study the tunnel was named Tlalocan or Path to the Underworld. More than 60,000 objects have been recovered after years of exploration and removing huge amounts of soil and stones. This paper presents the first results of accelerator mass spectrometry (AMS) radiocarbon dating performed on some of those materials recovered from the tunnel. With these findings, in combination with the archaeological data, based on stratigraphy and ceramic typology, a chronology of several events is proposed concerning the construction phases and ceremonial use, as well as partial and definitive closures of the tunnel. Every closure was accompanied by a deliberate and structured deposition of offerings and ritual refuse along the tunnel. The range of ages that covers the Bayesian calibration of samples collected along the tunnel is around 115 yr, from AD 125 to 240. Material collected at the surface of the chamber located at the end of the tunnel and under the pyramid gave ages in the interval between AD 400 and 534. All samples analyzed fall within the interval of time that covers the period of occupation of Teotihuacan.

scholarly journals SUSI’s Potential for Double Star Research

1992 ◽  
Vol 135 ◽  
pp. 521-526
Author(s):  
John Davis
Keyword(s):  
Angular Resolution ◽  
Double Star ◽  
Double Stars ◽  
Stellar Interferometer ◽  
New Instrument

AbstractThe Sydney University Stellar Interferometer (SUSI) is currently undergoing commissioning and will soon commence its astronomical program in which observations of double stars will form a major component. With its 640-m long North–South array of input siderostats, the new instrument will have unprecedented angular resolution.

scholarly journals Radial variation of whistler-mode chorus: first results from the STAFF/DWP instrument on board the Double Star TC-1 spacecraft

2005 ◽  
Vol 23 (8) ◽  
pp. 2937-2942 ◽  
Author(s):  
O. Santolík ◽  
E. Macúšová ◽  
K. H. Yearby ◽  
N. Cornilleau-Wehrlin ◽  
H. StC. K. Alleyne
Keyword(s):  
Cyclotron Frequency ◽  
Power Spectra ◽  
Double Star ◽  
Electron Cyclotron ◽  
Radial Variation ◽  
Whistler Mode ◽  
Electron Cyclotron Frequency ◽  
The Earth ◽  
First Results ◽  
Initial Results

Abstract. We use the first measurements of the STAFF/DWP instrument on the Double Star TC-1 spacecraft to investigate whistler-mode chorus. We present initial results of a systematic study on radial variation of dawn chorus. The chorus events show an increased intensity at L parameter above 6. This is important for the possible explanation of intensifications of chorus, which were previously observed closer to the Earth at higher latitudes. Our results also indicate that the upper band of chorus at frequencies above one-half of the electron cyclotron frequency disappears for L above 8. The lower band of chorus is observed at frequencies below 0.4 of the electron cyclotron frequency up to L of 11-12. The maxima of the chorus power spectra are found at slightly lower frequencies compared to previous studies. We do not observe any distinct evolution of the position of the chorus frequency band as a function of L. More data of the TC-1 spacecraft are needed to verify these initial results and to increase the MLT coverage.

scholarly journals Intelligent Sensors: Strategies for an Integrated Systems Approach

2005 ◽  
Author(s):  
Sanjeevi Chitikeshi ◽  
Ajay Mahajan ◽  
Pavan Bandhil ◽  
Lucas Utterbach ◽  
Fernanado Figueroa
Keyword(s):  
Intelligent Systems ◽  
Systems Approach ◽  
Integrated Systems ◽  
Self Assessment ◽  
Intelligent Monitoring ◽  
Intelligent Sensors ◽  
Processing And Storage ◽  
Work Done ◽  
And Storage ◽  
Made In

This paper proposes the development of intelligent sensors as an integrated systems approach, i.e. one treats the sensors as a complete system with its own sensing hardware (the traditional sensor), A/D converters, processing and storage capabilities, software drivers, self-assessment algorithms, communication protocols and evolutionary methodologies that allow them to get better with time. Under a project being undertaken at the Stennis Space Center, an integrated framework is being developed for the intelligent monitoring of smart elements. These smart elements can be sensors, actuators or other devices. The immediate application is the monitoring of the rocket test stands, but the technology should be generally applicable to the Intelligent Systems Health Monitoring (ISHM) vision. This paper outlines progress made in the development of intelligent sensors by describing the work done till date on Physical Intelligent Sensors (PIS) and Virtual Intelligent Sensors (VIS).

scholarly journals Is Grit the Key Element to Improve the Life Attitude? A Study with Military Students from Argentina

2019 ◽  
Vol 2 (3) ◽  
pp. 30
Author(s):  
María Cecilia Barni ◽  
Florencia Teresita Daura
Keyword(s):  
Undergraduate Students ◽  
Ad Hoc ◽  
Personal Relationships ◽  
Military Students ◽  
National Defense ◽  
Attitude Test ◽  
National Defense University ◽  
First Results ◽  
Probabilistic Sample ◽  
Made In

The main goal of the study is to analyze the link between Grit and Life Attitude, and its relation with the permanence and academic performance of students from the National Defense University. This paper is mainly focused in the link between the first two constructs. Grit is defined as the passion and constancy to achieving goals, to resisting with effort and interest towards the challenges and difficulties, which is a leader’s attribute (Duckworth, Peterson, Matthews y Kelly, 2007). Life Attitude based on the existential belief that life has a purpose, that persons draw meaning from a variety of sources: recreational and creative activities, personal relationships, achievements (Reker - Woo, 2011). A non-probabilistic sample was formed, for convenience, of 162 students; a sociodemographic questionnaire designed ad hoc; the Scale of Determination (Grit Scale) (Duckworth et al., 2007), which is in the process of validation (Tortul and Daura, in evaluation) and the Life Attitude Test (LAP-R (VE-AA)) in the Spanish adaptation of Barni (2017) were administered. Statistical analysis were made from the collected data, in order to corroborate if there were differences in the variables. The first results showed differences according to career and sociodemographic variables; the undergraduate students obtained higher scores in the positive dimensions of the LAP-R than in other researches made in the same geographical context. The work evidences data of interest in the training of defense professionals, for the decision making in the educational style necessary for an integral formation as a lifelong process.

scholarly journals Photometric Observations of Three Double Stars by the Occultation Method — Comparison with Interferometric Results and with Preliminary Results of HIPPARCOS

1992 ◽  
Vol 135 ◽  
pp. 546-548
Author(s):  
M. Froeschlé ◽  
C. Meyer
Keyword(s):  
Diffraction Pattern ◽  
Method Comparison ◽  
Short Description ◽  
Double Star ◽  
Preliminary Results ◽  
Double Stars ◽  
Photometric Observations

AbstractWe first briefly recall the geometry of the occultation of a double star by the Moon’s edge. Then we give a short description of the principle of the formation of the diffraction pattern. We present the results for three double stars and compare them with those obtained by other methods.

scholarly journals Astrometric Application of the Photoelectric Scanning Technique

1971 ◽  
Vol 5 ◽  
pp. 20-21
Author(s):  
Otto G. Franz
Keyword(s):  
Data Acquisition ◽  
National Science Foundation ◽  
Data Acquisition System ◽  
Double Star ◽  
Acquisition System ◽  
National Science Foundation Grant ◽  
Double Stars ◽  
Scanning Technique ◽  
National Science ◽  
Associated Data

AbstractA new photoelectric area scanner, designed primarily for observations of double stars, has been put into routine use at the Lowell Observatory. A description of the scanner and of the associated data acquisition system is given. The procedure of measuring the relative positions of double star components is described and the accuracy obtainable by this method is discussed. This contribution and a subsequent one (p. 170) will appear jointly under the title 'A Photoelectric Area Scanner for Astrometry and Photometry of Double Stars' in Lowell Observatory Bulletin No. 154. This work has been supported by National Science Foundation Grant GP-6983.

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