On the Tolerances of Filters for GAIA Medium Band Photometric System

2002 ◽  
pp. 57-62
Author(s):  
Algirdas Kazlauskas ◽  
Vladas Vansevičius ◽  
Audrius Bridžius ◽  
Ramutis Drazdys ◽  
Romualdas Kalytis
Keyword(s):  
Photometric System ◽  
Medium Band

scholarly journals Photometric Facilities of the AIST Space Project

1995 ◽  
Vol 166 ◽  
pp. 327-330
Author(s):  
I.M. Kopylov ◽  
D.L. Gorshanov ◽  
M.S. Chubey
Keyword(s):  
Photometric System ◽  
Space Project ◽  
Medium Band

The arguments are given of the choice for the Vilnius seven color medium band photometric system as the most effective one for the AIST space project. A prediction is made of the limiting stellar magnitudes V for every Vilnius passband and the integral band T at σΣ ≤ 30mmag from a 3 year AIST mission.

scholarly journals A Project for Investigation of the Stellar Populations of the Galactic Disk

1995 ◽  
Vol 164 ◽  
pp. 385-385
Author(s):  
V. Straižys ◽  
A. G. D. Philip
Keyword(s):  
Galactic Disk ◽  
Broad Band ◽  
Stellar Populations ◽  
Galactic Latitude ◽  
Photometric System ◽  
Medium Band

All models of the visual Galaxy are verified only in fields with galactic latitude |b| > 20°. At lower galactic latitudes, all the broad-band photometric systems and the majority of medium-band photometric systems fail to classify stars due to interstellar reddening. For the Vilnius photometric system the interstellar reddening is not an obstacle.

Star Classification Possibilities with the Gaia Spectrophotometers. III. The Classification Accuracy with Decontaminated BP/RP Spectra

2011 ◽  
Vol 20 (2) ◽  
Author(s):  
V. Straižys ◽  
R. Lazauskaitė
Keyword(s):  
Classification Accuracy ◽  
Photometric System ◽  
Acceptable Accuracy ◽  
Color Indices ◽  
Medium Band ◽  
Star Classification

AbstractA medium-band 12-color photometric system, based on the decontaminated Gaia BP/RP spectra, has been proposed in our Paper II. Here we analyze a possibility to apply some versions of this system for the determination of temperatures and gravities of stars both in the absence and the presence of interstellar reddening. The possibility to supplement this system with the broad BP and RP passbands is verified. We conclude that the system gives an acceptable accuracy of temperatures and luminosities if the accuracy of color indices is 0.02 mag or better and if the parallaxes of stars are known.

scholarly journals Multicolour Photometric System for Investigation of the Galaxy Population

1993 ◽  
Vol 136 ◽  
pp. 47-50
Author(s):  
V. Straižys
Keyword(s):  
Hubble Space Telescope ◽  
Broad Band ◽  
Photometric System ◽  
Space Telescope ◽  
Additional Information ◽  
Ccd Detector ◽  
The Galaxy ◽  
Medium Band ◽  
Galaxy Population

AbstractMany photometric systems for classification of stars have been proposed. However, not all of them are equally suitable for investigation of distant and reddened stars without additional information from their spectra. Earlier it was shown that the Vilnius photometric system is optimum for purely photometric classification of stars in spectral types, luminosities, metallicities and peculiarity types, when interstellar reddening is present. When realized with a CCD detector, the system permits to classify stars down to 17 mag with a 1.5 m class telescope or down to 20 mag with a 4 m telescope. A possibility of realizing the system with the WF camera of the Hubble Space Telescope is investigated. The problem of unification of broad-band and medium-band photometric systems is discussed.

scholarly journals Observed Relations Between Physical Properties and MK Classification as Functions of Metal Abundance for F5-K4 Stars

1976 ◽  
Vol 72 ◽  
pp. 75-78
Author(s):  
M. Grenon
Keyword(s):  
Physical Properties ◽  
Spectral Range ◽  
Spectral Type ◽  
Photometric System ◽  
Luminosity Class ◽  
Empirical Relations ◽  
Metal Abundance ◽  
Systematic Effects ◽  
The Absolute ◽  
Absolute Magnitudes

The Geneva photometric system has been calibrated in terms of [M/H], θeff, Mv in the spectral range F5 to K4. As the spectral type is a datum generally available, we derive empirical relations showing the coupling of θeff and [M/H] at given spectral type and luminosity class. Similar relations are offered for the absolute magnitudes and provide a more accurate means for deriving spectroscopic parallaxes. Systematic effects on the estimation of the luminosity class are also shown.

scholarly journals Efficient Inverted Solar Cells Using Benzotriazole-Based Small Molecule and Polymers

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 393
Author(s):  
Ja Eun Lee ◽  
Yoon Kim ◽  
Yang Ho Na ◽  
Nam Seob Baek ◽  
Jae Woong Jung ◽  
...  
Keyword(s):  
Solar Cell ◽  
Conjugated Polymers ◽  
Power Conversion ◽  
High Energy ◽  
Photovoltaic Properties ◽  
Device Structures ◽  
Donor Acceptor ◽  
Medium Band ◽  
Inverted Solar Cell ◽  
Conventional Device

We synthesized medium-band-gap donor-acceptor (D-A) -type conjugated polymers (PBTZCZ-L and PBTZCZ-H) consisting of a benzotriazole building block as an acceptor and a carbazole unit as a donor. In comparison with the polymers, a small conjugated molecule (BTZCZ-2) was developed, and its structural, thermal, optical, and photovoltaic properties were investigated. The power conversion efficiency (PCE) of the BTZCZ-2-based solar cell devices was less than 0.5%, considerably lower than those of polymer-based devices with conventional device structures. However, inverted solar cell devices configured with glass/ITO/ZnO:PEIE/BTZCZ-2:PC71BM/MoO3/Ag showed a tremendously improved efficiency (PCE: 5.05%, Jsc: 9.95 mA/cm2, Voc: 0.89 V, and FF: 57.0%). We believe that this is attributed to high energy transfer and excellent film morphologies.

Alkoxyphenylthiophene Linked Benzodithiophene Based Medium Band Gap Polymers for Organic Photovoltaics: Efficiency Improvement upon Methanol Treatment Depends on the Planarity of Backbone

2014 ◽  
Vol 47 (20) ◽  
pp. 7060-7069 ◽  
Author(s):  
Kakaraparthi Kranthiraja ◽  
Kumarasamy Gunasekar ◽  
Woosum Cho ◽  
Myungkwan Song ◽  
Young Geun Park ◽  
...  
Keyword(s):  
Band Gap ◽  
Organic Photovoltaics ◽  
Efficiency Improvement ◽  
Methanol Treatment ◽  
Medium Band

Coordinated diameter oscillations at arteriolar bifurcations in skeletal muscle

1987 ◽  
Vol 253 (3) ◽  
pp. H568-H573 ◽  
Author(s):  
J. U. Meyer ◽  
L. Lindbom ◽  
M. Intaglietta
Keyword(s):  
Skeletal Muscle ◽  
Fundamental Frequency ◽  
Narrow Band ◽  
Photometric System ◽  
Band Frequency ◽  
Skeletal Muscle Microcirculation

The spontaneous rhythmical luminal changes (vasomotion) at bifurcations in the microvasculature of the rabbit tenuissimus muscle were investigated by means of a microscope video photometric system. Video scenes, containing two terminal arterioles originating from one transverse arteriole, showed that adjacent terminal arterioles constricted synchronously in 26 out of 31 contraction cycles. The onset of 60 constrictions in the parent transverse vessels was synchronized with the activity in terminal arterioles in 75% of the cycles and delayed in 25%. Vasomotion in the parent transverse vessels was notably smaller than in the terminal vessels. All the terminal arterioles in the different animals oscillated at the fundamental frequency of 18.9 +/- 3.5 cycles/min. We conclude that in the skeletal muscle microcirculation 1) coordinated spontaneous diameter oscillations occur in arterioles that are in proximity, 2) diameter changes are most pronounced in the terminal arterioles, and 3) coordinated vasomotion in this tissue exhibits a characteristic narrow band frequency. The presence of a microvascular pacemaker is hypothesized.

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