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spectral class
Spectral Classes for Main Sequence Stars
Spectral Classes for Main Sequence Stars
| Characteristics of Spectral Classes for Main Sequence Stars |
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| Class
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Color
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Surface Temperature
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Strong Lines
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| O
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blue-white
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35,000°C
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ionized helium
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| B
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blue-white
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21,000°C
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helium
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| A
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white
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10,000°C
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hydrogen
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| F
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creamy
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7,000°C
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ionized calcium
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| G
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yellow
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6,000°C
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calcium
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| K
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orange
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4,500°C
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titanium oxide
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| M
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red
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3,000°C
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titanium oxide
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Cite this article
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Tunable thin films as sensors: a family of microtunable thin-film filters originally developed for the telecom industry is enabling new classes of near- and mid-IR optical spectral sensors suitable for trace gas detection, Raman analysis, and 2D lab-on-a-chip applications.(SENSOR TECHNOLOGY AND DESIGN)
Magazine article from: Sensors Magazine; 9/1/2005; ; 700+ words
; ...Perot filter is limited by its inflexible spectral bandpass shape, a pointed narrow transmission...mirrors, are capable of more varied spectral shapes, including flat-top filters...silicon with germanium thin films. This spectral range includes many commercially and...
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Spectral Organization of Ommatidia in Flower-visiting Insects[dagger]
Magazine article from: Photochemistry and Photobiology; 1/1/2007; ; 700+ words
; ...according to the combination of spectral classes of photoreceptors. Honeybees...ommatidium. At least three classes of spectral receptors were identified...The localization of these spectral receptors has been studied by...
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Hypothesis Testing in Time Series via the Empirical Characteristic Function: A Generalized Spectral Density Approach.(Statistical Data Included)
Magazine article from: Journal of the American Statistical Association; 12/1/1999; ; 700+ words
; ...differentiating the generalized spectral density with respect...The consistency of a class of Parzen's kernel...estimators for the generalized spectral density is establ ished...much flexibility for spectral analysis, rendering...estimated consistently by a class of Par
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On the spectral ranges that are resolved by a single satellite in exact-repeat sampling mode
Magazine article from: Journal of Atmospheric and Oceanic Technology; 12/1/1998; ; 700+ words
; ...the data in the sense that spectral components within the range...distinguishable from each other? (The spectral components are evenly distributed...Of particular interest is a class of satellites that repeat their...on its usage in the data or spectral domain, unfortunately conveys...
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The Spectral Analysis of Time Series (2nd ed.).(Review)
Magazine article from: Journal of the American Statistical Association; 12/1/2000; ; 700+ words
; ...space in which notions of classes of functions having finite...integral. Chapter 2, Models for Spectral Analysis, The Univariate...contains a correlation and spectral theory for a class of nonrandom functions having...author then introduces the spectral measure for a weakly stationary...
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Spectral ModelingTM technology substantiated through creation of antipsychotic bank of drug candidates.
M2 Presswire; 5/19/2008; 700+ words
; ...using proprietary in silico Spectral ModelingTM techniques to create...antipsychotics as well as other drug classes). The goal of the spectral analysis was to produce molecules...absolute affinities predicted by spectral analysis. These agents are...
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BAXTER DIAGNOSTICS INC., ENTERS INTO STRATEGIC CARDIAC DIAGNOSTIC ALLIANCE WITH SPECTRAL DIAGNOSTICS INC. AND PLANS FOR EQUITY INVESTMENT
PR Newswire; 6/29/1993; 700+ words
; ...common shares of Spectral. Spectral shall have the right to require...Bail, chairman and CEO, Spectral Diagnostics Inc., said...Immunochemistry Division, a world class organization and leader in...cardiac diagnostic research at Spectral in support of the next generations...
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Efficient company-wide sharing of spectroscopy databases: A client-server computing for spectral searching
Magazine article from: Spectroscopy; 11/1/2000; ; 700+ words
; ...perform rapid and reliable spectral searching against large digital...identify their compounds. Today spectral searching has evolved to the...spectrometry [MS]) and different classes of materials (such as organics...organizations that depend on searching spectral databases have developed their...
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Spectral Diagnostics Announces Collaboration With Toray Industries Of Japan For Clinical Use Of The Endotoxin Activity Assay'TM'.
News Wire article from: Canadian Corporate News; 12/14/2004; 700+ words
; ...striving to become a world-class corporate group that delivers...approximately $5 Billion. Spectral is a developer of innovative...comprehensive disease management. Spectral provides accurate and timely...Endotoxin Activity Assay(TM). Spectral manufactures the EAA and Cardiac...
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Logic circuit equivalence checking using Haar Spectral coefficients and partial BDDs.(binary decision diagram)
Magazine article from: VLSI Design; 1/1/2002; ; 700+ words
; ...values. However, some classes of functions result in OBDDs...terms of a subset of Haar spectral coefficients [10,11]. Given a set of Haar spectral coefficients, we examine...provide subsets of Haar spectral coefficients [8,9,18...
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Spectral Classes for Main Sequence Stars
Book article from: The Columbia Encyclopedia, Sixth Edition
Spectral Classes for Main Sequence Stars Characteristics of Spectral Classes for Main Sequence Stars Class Color Surface Temperature Strong Lines O blue-white 35,000°C ionized helium B blue-white 21,000°C helium A white 10...
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spectral class
Book article from: The Columbia Encyclopedia, Sixth Edition
spectral class in astronomy, a classification...which lists the spectral classes of 255,000 stars...R, N, and S are classes similar to the K and...numeral is added to the spectral class to specify the luminosity...
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spectral classification
Book article from: A Dictionary of Astronomy
...In the late 1990s, spectral types L and T were added...brown dwarfs (with class Y reserved for the coolest...range of luminosity classes indicated by a Roman...stars). Luminosity classes VI (subdwarfs) and...assigned luminosity class Ia‐0. The dominant spectral features and ...
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Spectral Classification of Stars
Encyclopedia entry from: The Gale Encyclopedia of Science
...two groups based on their spectral lines. He eventually extended...than 4,000 stars into four classes. The basis of the current system of classification of spectral types began in the late 1800s...smooth transition between the class boundaries. This reordering...changes within a class. This ...
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luminosity class
Book article from: A Dictionary of Astronomy
...can vary widely for a given spectral type . Luminosity class indicates, for example...or a dwarf. The luminosity class is assigned by examination...line ratios. The luminosity classes generally used are: Ia...Russell diagram . See also spectral classification .
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