TIGvival: High-resolution spectroscopic monitoring of LPV stars

2018 ◽  
Vol 14 (S343) ◽  
pp. 548-549
Author(s):  
Uwe Wolter ◽  
Dieter Engels ◽  
Bernhard Aringer ◽  
Bernd Freytag
Keyword(s):  
High Resolution ◽  
Monitoring Program ◽  
Chemical Properties ◽  
Low Noise ◽  
Long Period ◽  
Spectroscopic Monitoring ◽  
Robotic Telescope ◽  
Sample Case ◽  
Visual Light ◽  
And Chemical Properties

AbstractTIGvival is a spectroscopic monitoring program of long-period variables (LPV) using our robotic telescope TIGRE. Since 2013, we obtain low-noise, high-resolution spectra (R= 20 000) that cover the optical regime (3800 Å to 8800 Å). We are now continuously monitoring 7 LPVs with different periods and chemical properties. Our 350+ spectra evenly sample the target cycles, as far as ground-based observations allow. Analyzing the TIGvival spectra of Mira as a sample case, our measurements indicate that the strength of the TiO-absorption is phase-shifted with respect to the visual light curve.

MANAGEMENT OF THE UNIACKE G-72 INCIDENT

1985 ◽  
Vol 1985 (1) ◽  
pp. 311-313 ◽  
Author(s):  
S. D. Gill ◽  
C. A. Bonke ◽  
J. Carter
Keyword(s):  
Monitoring Program ◽  
Chemical Properties ◽  
Well Being ◽  
Gas Well ◽  
Well Control ◽  
Drilling Rig ◽  
Sampling Program ◽  
Control Procedures ◽  
Physical And Chemical ◽  
And Chemical Properties

ABSTRACT During the evening of February 22, 1984, the Uniacke G-72 gas well being drilled 150 nautical miles off Halifax, Nova Scotia, by the semisubmersible drilling rig, Vinland, under contract to Shell Canada Resources, blew out of control, emitting gas and condensate at an estimated rate of 300 bbl per day. During the following 10 days while Shell was assembling personnel, vessels, and equipment for reboarding the rig and initiating well control procedures, a comprehensive environmental monitoring program was put in place. An air, slick, and water column sampling program was initiated to provide information on the physical and chemical properties of the condensate. This paper describes the primary findings of the program that involved the coordination of government, area petroleum operators, and consultants.

Investigating Electronic and Chemical Properties of Ge/GeOxNy/HfO2 Gate Stacks : High-Resolution Photoelectron Spectroscopy Using Synchrotron Radiation

2019 ◽  
Vol 3 (2) ◽  
pp. 385-390
Author(s):  
Olivier J. Renault ◽  
Eugénie Martinez ◽  
Lionel Fourdrinier ◽  
Laurent Clavelier ◽  
Nick Barrett ◽  
...  
Keyword(s):  
High Resolution ◽  
Synchrotron Radiation ◽  
Photoelectron Spectroscopy ◽  
Chemical Properties ◽  
Gate Stacks ◽  
And Chemical Properties

scholarly journals Properties of meteoroids from different classes of parent bodies

2006 ◽  
Vol 2 (S236) ◽  
pp. 107-120 ◽  
Author(s):  
Jiří Borovička
Keyword(s):  
Chemical Properties ◽  
Light Curves ◽  
Carbonaceous Chondrites ◽  
Meteor Showers ◽  
Long Period ◽  
Cometary Material ◽  
Physical And Chemical ◽  
Cometary Origin ◽  
And Chemical Properties

AbstractMeteoroids observed to disintegrate in the terrestrial atmosphere can be directly linked to their parent bodies in case that they belong to certain meteor showers. We present a list of two dozens of parent bodies reliably associated with well recognized meteor showers. Among the parent bodies are long period comets, Halley-type comets, Jupiter family comets, comets of the inner solar system (such as 2P/Encke) and asteroids. Physical and chemical properties of meteoroids coming from various parents are compared on the basis of meteor heights, decelerations, light curves and spectra. Jupiter family comets produce meteoroids with the lowest strength, namely porous aggregates of dust grains with bulk densities of about 0.3 g cm−3 or less. Halley type material is somewhat stronger and the material related to comet Encke is even stronger. In addition, small strong constituents, perhaps similar to carbonaceous chondrites, can be encountered within the normal cometary material. The strength of cometary material is also enhanced by long-term exposure to cosmic rays and by solar heating in the vicinity to the Sun (r<0.2 AU). Both these processes lead to the loss of volatile sodium. Southern δ-Aquariids, Geminids and partly also Quadrantids were influenced by solar radiation. We argue that these showers, the asteroids associated with them ((3200) Phaethon and 2003 EH1), and the whole interplanetary complexes they belong to are of cometary origin. The argument is supported by lower than chondritic Fe/Mg ratio found in Geminids as well as in Halley type comets. The typical property of stony meteoroids of asteroidal origin is the presence of internal cracks which cause that the incoming meteoroids are much weaker than the recovered meteorites.

scholarly journals OWN Survey: a spectroscopic monitoring of Southern Galactic O and WN-type stars

2016 ◽  
Vol 12 (S329) ◽  
pp. 89-96 ◽  
Author(s):  
Rodolfo H. Barbá ◽  
Roberto Gamen ◽  
Julia I. Arias ◽  
Nidia I. Morrell
Keyword(s):  
High Resolution ◽  
Monitoring Program ◽  
Spectroscopic Monitoring ◽  
The Status

AbstractWe summarize the status and results of the OWN Survey, a high-resolution monitoring program of Southern Galactic O- and WN-type stars, after twelve years of observing campaign.

AGB stars in Gaia DR2

2018 ◽  
Vol 14 (S343) ◽  
pp. 73-76 ◽  
Author(s):  
Thomas Lebzelter ◽  
Nami Mowlavi ◽  
Paola Marigo ◽  
Isabelle Lecoeur-Taibi ◽  
Michele Trabucchi ◽  
...  
Keyword(s):  
Chemical Properties ◽  
Variable Stars ◽  
Light Curves ◽  
Agb Stars ◽  
Long Period ◽  
First Results ◽  
Period Variable ◽  
Photometric Index ◽  
Gaia Dr2 ◽  
And Chemical Properties

AbstractGaia Data Release 2 (DR2; April 25, 2018) provides astrometric and photometric data for more than a billion stars - among them many AGB stars. As part of DR2 the light curves of several hundreds of thousand variable stars, including many long-period variable (LPV) candidates, are made available. The publication of the light curves and LPV-specific attributes in addition to the standard DR2 products offers a unique opportunity to study AGB stars. In this contribution, we present the first results for AGB stars based on the analysis of the Gaia data performed after their release. As an immediate result of the Gaia DR2 LPV database we introduce a new photometric index capable of efficiently distinguishing AGB stars of different masses and chemical properties.

Statistical criteria of stellar population types

1966 ◽  
Vol 24 ◽  
pp. 101-110
Author(s):  
W. Iwanowska
Keyword(s):  
Stellar Population ◽  
Chemical Properties ◽  
Spectrophotometric Study ◽  
Physical And Chemical Properties ◽  
Population Type ◽  
The Galaxy ◽  
Distribution Parameters ◽  
Physical And Chemical ◽  
Statistical Criteria ◽  
And Chemical Properties

In connection with the spectrophotometric study of population-type characteristics of various kinds of stars, a statistical analysis of kinematical and distribution parameters of the same stars is performed at the Toruń Observatory. This has a twofold purpose: first, to provide a practical guide in selecting stars for observing programmes, second, to contribute to the understanding of relations existing between the physical and chemical properties of stars and their kinematics and distribution in the Galaxy.

Microcalorimeters for X-Ray Spectroscopy

1988 ◽  
Vol 102 ◽  
pp. 41
Author(s):  
E. Silver ◽  
C. Hailey ◽  
S. Labov ◽  
N. Madden ◽  
D. Landis ◽  
...  
Keyword(s):  
High Resolution ◽  
High Efficiency ◽  
Thermal Response ◽  
Low Noise ◽  
High Resolution Spectroscopy ◽  
Superconducting Transition ◽  
Sapphire Substrates ◽  
Laboratory Plasmas ◽  
Adiabatic Demagnetization ◽  
Theoretical Predictions

The merits of microcalorimetry below 1°K for high resolution spectroscopy has become widely recognized on theoretical grounds. By combining the high efficiency, broadband spectral sensitivity of traditional photoelectric detectors with the high resolution capabilities characteristic of dispersive spectrometers, the microcalorimeter could potentially revolutionize spectroscopic measurements of astrophysical and laboratory plasmas. In actuality, however, the performance of prototype instruments has fallen short of theoretical predictions and practical detectors are still unavailable for use as laboratory and space-based instruments. These issues are currently being addressed by the new collaborative initiative between LLNL, LBL, U.C.I., U.C.B., and U.C.D.. Microcalorimeters of various types are being developed and tested at temperatures of 1.4, 0.3, and 0.1°K. These include monolithic devices made from NTD Germanium and composite configurations using sapphire substrates with temperature sensors fabricated from NTD Germanium, evaporative films of Germanium-Gold alloy, or material with superconducting transition edges. A new approache to low noise pulse counting electronics has been developed that allows the ultimate speed of the device to be determined solely by the detector thermal response and geometry. Our laboratory studies of the thermal and resistive properties of these and other candidate materials should enable us to characterize the pulse shape and subsequently predict the ultimate performance. We are building a compact adiabatic demagnetization refrigerator for conveniently reaching 0.1°K in the laboratory and for use in future satellite-borne missions. A description of this instrument together with results from our most recent experiments will be presented.

The microstructure of a TiB2/Ti-47 Al composite material

1989 ◽  
Vol 47 ◽  
pp. 674-675
Author(s):  
O. Popoola ◽  
A.H. Heuer ◽  
P. Pirouz
Keyword(s):  
Composite Material ◽  
Ion Beam ◽  
Chemical Properties ◽  
Intermetallic Alloys ◽  
Transmission Electron ◽  
Diamond Polishing ◽  
Al Composite ◽  
The Matrix ◽  
Argon Ion ◽  
And Chemical Properties

The addition of fibres or particles (TiB2, SiC etc.) into TiAl intermetallic alloys could increase their toughness without compromising their good high temperature mechanical and chemical properties. This paper briefly discribes the microstructure developed by a TiAl/TiB2 composite material fabricated with the XD™ process and forged at 960°C.The specimens for transmission electron microscopy (TEM) were prepared in the usual way (i.e. diamond polishing and argon ion beam thinning) and examined on a JEOL 4000EX for microstucture and on a Philips 400T equipped with a SiLi detector for microanalyses.The matrix was predominantly γ (TiAl with L10 structure) and α2(TisAl with DO 19 structure) phases with various morphologies shown in figure 1.

Tailoring microstructures of materials through biomimetics

1993 ◽  
Vol 51 ◽  
pp. 500-501
Author(s):  
Mehmet Sarikaya ◽  
Ilhan A. Aksay
Keyword(s):  
Chemical Properties ◽  
Design And Synthesis ◽  
Structure Sensitive ◽  
Macro Scale ◽  
Methods Of Synthesis ◽  
Successive Level ◽  
Engineering Materials ◽  
Physical And Chemical ◽  
And Chemical Properties ◽  
Synthesis Of Materials

Biomimetics involves investigation of structure, function, and methods of synthesis of biological composite materials. The goal is to apply this information to the design and synthesis of materials for engineering applications.Properties of engineering materials are structure sensitive through the whole spectrum of dimensions from nanometer to macro scale. The goal in designing and processing of technological materials, therefore, is to control microstructural evolution at each of these dimensions so as to achieve predictable physical and chemical properties. Control at each successive level of dimension, however, is a major challenge as is the retention of integrity between successive levels. Engineering materials are rarely fabricated to achieve more than a few of the desired properties and the synthesis techniques usually involve high temperature or low pressure conditions that are energy inefficient and environmentally damaging.In contrast to human-made materials, organisms synthesize composites whose intricate structures are more controlled at each scale and hierarchical order.

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