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Topic: Irregular variable

	Variable star - Wikipedia, the free encyclopedia
		By 1786 twelve variable stars were known, among them the first eclipsing variable, Algol, discovered by Geminiano Montanari in 1669; John Goodricke in 1784 gave the correct explanation of its variability.
		Variable stars are generally analysed using photometry, spectrophotometry and spectroscopy.
		Variability of T Tauri stars is due to spots on the stellar surface and gas-dust clumps, orbiting in the circumstellar disks.
	en.wikipedia.org /wiki/Variable_star (3628 words)

	Irregular variable - Wikipedia, the free encyclopedia
		An irregular variable is a type of variable star in which variations in brightness show no regular periodicity.
		The third category of eruptive irregulars are the IS stars, which show rapid variations of 0.5 to 1 magnitude in a few hours or days; again, these come in subgroups ISA and ISB.
		Irregular pulsating giants or supergiants, all of late spectral types (K, M, C, or S), are classed as type L-LB for giants and LC for supergiants.
	en.wikipedia.org /wiki/Irregular_variable (168 words)

	Irregular Choice Resources & Information - choice irregular
		In language, irregular choice and shoes it is applied to a word that do not follow the most irregular choice london common rules of the language, such as irregular verb, plural or spelling.
		By itself, a single irregularity is of little choice irregular consequence, but when many irregularities irregular choice occur together, they may be signs of hidden fraud, misconduct or malfeasance.
		In military terms, an irregular is a soldier who is not irregular choice mens shoes part of the official regular army, or does not follow regular army tactics.
	www.bizhisto.com /Biz-Retail-Companies-I---Ke/Irregular-Choice.html (372 words)

	[No title] (Site not responding. Last check: 2007-10-31)
		ISA Rapid irregular variables of the early spectral types, B-A or Ae; ISB Rapid irregular variables of the intermediate and late spectral types, F-M and Fe-Me. RCB Variables of the R Coronae Borealis type.
		The period of variation is close to the orbital one, and the variability amplitude is usually as great as 0.2 mag in V (UX Ari).
		The variability of the wave's amplitude (which may be up to 0.2 mag in V) is explained by the existence of a long-period stellar activity cycle similar to the 11-year solar activity cycle, during which the number and total area of spots on the star's surface vary.
	www.sai.msu.su /groups/cluster/gcvs/gcvs/iii/vartype.txt (4771 words)

	Variable Stars
		As for the physical variable stars, on the contrary, the luminosity variations are due to changes of the characteristics of the star: so the star must find another equilibrium state.
		In other cases these variations occur regularly and periodically; during one period the magnitude, the temperature, the density, the radius and the radial velocity of the stellar gas change, with real oscillations or pulsations.
		The RR Lyrae are pulsating variable stars of a different type and magnitude: these are stars of the horizontal branch, and are going through a phase of instability.
	www.pd.astro.it /E-MOSTRA/NEW/A3041VAR.HTM (701 words)

	Deep Sky Intro
		Variable stars- these are the stars that modify their brightness.
		The former vary their brightness for physical reasons (contraction, eruption, expansion) while the latter's variation in brightness is a result of periodical eclipses of the star by another star orbiting around it, or because of star rotation effects.
		Irregular galaxies have no definite shape, being formed of chaotic agglomerations of stars and gas.
	www.nightskyinfo.com /deep_sky_intro (1190 words)

	Variable Stars (Site not responding. Last check: 2007-10-31)
		Variable stars may be classified into three broad types according to the origin and nature of their variability: (1) eclipsing, (2) pulsating, and (3) explosive.
		In an eclipsing variable, one member of a double, or binary, star system partially blocks the light of its companion as it passes in front of the latter, as observed from Earth.
		Unlike eclipsing binaries, the other two types of variable stars are intrinsically variable--that is to say, their own output of radiant energy fluctuates with time, and are used for distance scale measurements.
	abyss.uoregon.edu /~js/glossary/variable_stars.html (209 words)

	[No title]
		For an irregular field, there is no restriction on the correspondence between computational space and physical space.
		variable n file=filespec filetype=type skip=n offset=m stride=p coord n file=filespec filetype=type skip=n offset=m stride=p variable specifies where to find data information, its type, and how to read it.
		The individual parameters are interpreted as follows: n An integer value that specifies which element of a data vector or which coordinate (1 for x, 2 for y, 3 for z, etc.) the subsequent read instructions apply to.
	www.nada.kth.se /~johani/read_field.txt (4366 words)

	CU Draconis
		Slow irregular variables of late spectral types (K, M, C, S); as a rule, they are giants (CO Cyg).
		This type is also ascribed, in the GCVS, to slow red irregular variables in the case of unknown spectral types and luminosities.
		Irregular variable supergiants of late spectral types having amplitudes of about 1 mag in V (TZ Cas).
	www.alcyone.de /SIT/bsc/HR5226.html (375 words)

	[No title]
		The new variability types (ZZO, AM, R, BE, LBV, BLBOO) have been added in the Name-Lists 67- 72 and in the GCVS vol.V. ZZO ZZ Cet type variables of the DO spectral type showing HeII and and CIV absorbtion lines in their spectra.
		GAL Optically variable quasistellar extragalactic objects (active galactic nuclei [AGNs]) considered to be variable stars by mistake.
		QSO Optically variable quasistellar extragalactic sources (quasars) that earlier were erroneously considered to be variable stars.
	www.aavso.org /gcvstype.txt (4696 words)

	Heart Irregular -- Recommendations and Resources (Site not responding. Last check: 2007-10-31)
		The term ''irregular'' is used loosely used in many fields, and most fields don't have an article for their meaning of ''irregular''.
		Truly irregular verbs in Latin are a rather small class; they include ''esse'' ("to be"); ''dare'' and its derivatives ("to give"); ''êsse'' ("to eat"); ''ferre'' and its derivatives ("to carry"); ''velle'' and its derivatives ("to wish"); ''ire'' and its derivatives ("to go"); and ''fieri'' ("to become").
		The irregular verbs in Latin AFAIK are ''esse'' and its derivatives, ''posse'', ''dare'', ''êsse'', ''ferre'' and its derivatives, ''velle'' and its derivatives, ''fieri'', and ''ire'' and its derivatives.
	www.becomingapediatrician.com /health/71/heart-irregular.html (1375 words)

	Paper Abstract (Site not responding. Last check: 2007-10-31)
		We present the results of an extensive search for periodic and irregular variable pre-main sequence (PMS) stars in the young (2-4 Myr) open cluster NGC 2664, based on photometric monitoring using the Wide Field Imager (WFI) on the 2.2m telescope on La Silla (Chile).
		We found that the periodic variables, as a group, have a smaller degree of variability and smaller Halpha index than the irregular variables.
		This suggests that the sample of periodically variable stars is biased towards weak-line T Tauri stars (WTTSs) while most of the irregular variables are probably classical T Tauri stars (CTTSs).
	www.mpia-hd.mpg.de /homes/calj/ngc2264_p1.html (426 words)

	variable star
		Variable stars fall into two general categories: intrinsic variables, in which physical changes, such as pulsations or eruptions, are involved, and extrinsic variables, in which the light output fluctuates due to eclipses or stellar rotation.
		Specific types of variable star are often named after a prototype (see variable star naming).
		Semi-regular variable (giant star; periodic with intervals of irregular variation)
	www.daviddarling.info /encyclopedia/V/variablestar.html (463 words)

	AVS Field Data
		There are two variants: we shall consider first data-parsing mode, which is more general, and then look briefly at native mode.
		The variable and coord lines have the same format, and explain how these values are to be found.
		For example, the values for the two variables might be in separate files; or we might have all the values for one variable, followed by all the values for the other.
	astronomy.swin.edu.au /~pbourke/dataformats/field (679 words)

	How To Decipher Those Classification Codes
		Many years ago, many classes of variable were described in terms of a prototype star; and astronomers would define new classes to encompass minor observational differences from known variables.
		Adding to the confusion, many variables would be in two or more classes depending on the criteria used to describe them.
		Variations from 2.5 to 11 magnitudes or more; and variations do not repeat exactly from one cycle to the next.
	www.assa.org.au /sig/variables/classifications.asp (1860 words)

	[No title]
		For this, variables correspond to regions, and values of the variables correspond to labels (from a finite label set) for the identity of each region.
		This is because when two adjacent expressions don't have variables in common, the variable bindings in the first are irrelevant to the success or failure of the second, and backtracking may be wasting its time going to the second when a failure is due to the first.
		Studying variable r1 Studying variable r2 Possibilities for r2 reduced to [grass] Studying variable r3 Possibilities for r3 reduced to [house] Studying variable r4 Possibilities for r4 reduced to [pavement] Studying variable r5 Possibilities for r5 reduced to [house,vehicle] Studying variable r1 Possibilities for r1 reduced to [water] choice_list(r1,[water]).
	www.cs.nps.navy.mil /people/faculty/rowe/book/chap13.html (8962 words)

	Margill - The Interest calculation software - Loan calculations, Line of credit, APR
		Irregular loan : refund interest only, then of a fixed principal amount and a regular refund.
		Enter 3 of 4 variables (Interest, Principal, Number of payments or Payment) and the 4th will be calculated automatically.
		A loan is made with regular or irregular payments but with an unknown interest rate.
	www.margill.com /calculations/loans-en.htm (1476 words)

	Abstract (Site not responding. Last check: 2007-10-31)
		We identified 405 periodic variable and 184 irregular variable PMS stars as cluster members using these two different tests.
		We find that the periodic variables, as a group, have a smaller degree of variability and smaller Halpha index than the irregular variables.
		This suggests that the sample of periodic variables is biased towards weak-line T Tauri stars (WTTSs) while most of the irregular variables are probably classical T Tauri stars (CTTSs).
	www.astro.utoronto.ca /~aleks/lamm_abs.html (465 words)

	cataclysmic variable concept from the Astronomy knowledge base (Site not responding. Last check: 2007-10-31)
		has acronym CV has definition A type of variable including flare stars and novae (common, recurrent, and dwarf), all of which are believed to be very close binary systems in which hydrogen-rich matter flows from a late-type star onto a hot white-dwarf primary.
		pulsating nova (2 facts) - A variable star, probably not a true nova, in which the change between more and less luminous stages is extreme.
		R Coronae Borealis variable (1 kind, 17 facts) - A very luminous helium-rich, carbon-rich, hydrogen-poor eruptive variable supergiant whose light declines up to 8 magnitudes at irregular intervals.
	www.site.uottawa.ca:4321 /astronomy/cataclysmicvariable.html (790 words)

	CBA Belgium Observatory CCD Repository (Site not responding. Last check: 2007-10-31)
		V478 Her previously was classified as an irregular variable (IS:), with a variability range of mag 15.5 - 17.1p.
		The variable was estimated to be mag 15.85 (unfiltered).
		Due to the short nights in Belgium, during this period of the year, we could not follow the variable for a longer duration, but we hope that contributions from other observatories will help in securing the classification of the variable.
	users.skynet.be /fa079980/cv_2001/Her_V478_jun_2001.html (325 words)

	Magnitude of Oscillations in the Response of Ia Muscle Spindle Endings Under a Static gamma Stimulation of Increasing ...
		frequency or of submultiples of it or to irregular discharging
		interpret the variable and irregular Ia discharges as being a
		Ia afferents are driven in a 1:1 rhythm with the
	jn.physiology.org /cgi/content/full/89/4/1748 (7626 words)

	[75.17] Classification of the Enigmatic Variable XX Sct (Site not responding. Last check: 2007-10-31)
		The irregular variable XX Sct has been ascribed five different variability types since its discovery in 1924, from a Cepheid to a rapid irregular variable.
		We sought to resolve this puzzle by a careful reexamination of nearly 1200 blue photographic plates of this star at the Maria Mitchell Observatory.
		These revealed strong irregular variability of up to 2 magnitudes on different time scales, including Algol-like minima with a timescale of 10 days or less.
	www.aas.org /publications/baas/v31n5/aas195/599.htm (190 words)

	R Coronae Stars (Site not responding. Last check: 2007-10-31)
		These are among the strangest of all variable stars, and also peculiar in that their normal (i.e., non-variable) state is maximum, so while the dwarf novae have outbursts, these have fades.
		Naturally, these variations are completely random and unpredictable, both in style and duration, though typically the recovery to maximum is slower than the fall, and tends to be interrupted by irregular fluctuations.
		The minimum is caused by a dust cloud of amorphous carbon (extinction curves have confirmed that the dust causing the decline is carbon-rich), which eclipses the photosphere of R CrB, preventing an observer from seeing the entirety of the star’s luminosity.
	freespace.virgin.net /m.poxon/rcbstars.htm (2156 words)

	[No title]
		Cepheids, RR Lyrae and other variable stars play an important role in determining the scale of the Universe.
		On the one hand, numerical hydrodynamical simulations generate accurate state-of-the-art models and their stability properties, and on the other hand, analytical approaches, such as bifurcation theory and normal forms, provide a framework within which one can understand the systematics of the variety of observed behavior.
		In the case of variable stars we can thus extract novel physical properties of the underlying pulsation mechanism from the mere knowledge of the observed lightcurves of irregular variable stars.
	www.phys.ufl.edu /~buchler/brochure.html (655 words)

	Variable Stars (Site not responding. Last check: 2007-10-31)
		Nebular or Orion variables, irregular variables associated with bright diffuse nebulae.
		There are type I (Delta Cephei) and type II (W Virginis) Cepheids, distinguished by chemical composition and membership in different stellar populations (type I Cepheids are found in population I, i.e.
		spiral arms and irregular galaxies, type II in population II, globular clusters, galactic halos and ellipticals), and different period-luminosity relations (for the same period, type I Cepheids are typically about 1.5 magnitudes brighter).
	www.seds.org /~spider/spider/ScholarX/variables.html (329 words)

	Fourth supplement to the catalogue of observed periods of Ap stars
		21 further stars are introduced for which a periodic variability has recently been discovered or for which it was known before but it was not reported in previous issues of this catalogue.
		Recently attributed variable star names are also quoted.
		Light variations are mainly due to the eclipse by a ring or cloud of circumstellar material (Groote and Hunger 1982) [HD 47152]: interf.
	www.cs.wisc.edu /niagara/data/nasa/A+AS_121_57.xml (2068 words)

	irregular variable Comparison Table (Site not responding. Last check: 2007-10-31)
		Next variable: luminous blue variable Up: variable Previous variable: bright blue variable
		The class comprises supernovae, novae, recurrent novae, dwarf novae and flare stars.
		Also called T Tauri variable, a type of variable star of spectral classification F, G or K (giants above the main sequence on the Hertzsprung-Russell diagram) that loses an appreciable proportion of its mass in its (irregular) more luminous periods, and is thus surrounded by volumes of gas and dust.
	www.site.uottawa.ca:4321 /astronomy/irregularvariable_table.html (117 words)

	Modeling Neuromuscular Modulation in Aplysia. III. Interaction of Central Motor Commands and Peripheral Modulatory ...
		Representative dataset of irregular firing of motor neurons B15 and B16 in a freely feeding animal.
		-h irregular meal simulated with one set of modulatory components was subtracted from the corresponding performance with a different set of modulatory components.
		"Median of irregular, regular": a regular pattern constructed with the median parameter values of the 749 cycles of the irregular meal from Fig.
	jn.physiology.org /cgi/content/full/93/3/1523 (6688 words)

	Chaos in the Stars
		The pulsations of this star are quite violent, with the luminosity varying up to factors of 40, with shockwaves and ionization fronts criss-crossing the stellar envelope.
		State of the art hydrodynamical simulations of the nonlinear behavior of similar types of stars (W Virginis type stars) that were performed a decade ago [5, 6] had predicted the chaotic nature of these pulsations.
		Kovacs G. and Buchler J.R. Regular and Irregular Pulsations in Population II Cepheids, Astrophysical Journal 334, 971.
	www.phys.ufl.edu /~buchler/chaos/chaos.html (686 words)

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