Somario

A comparison of the sizes and colors of the stars in the Alpha Centauri system with the Sun.

Ghe xe na version vetoriale de sta imagine ("SVG"). Te pol dopararla al posto de sta imagine raster co che xe necessaria na risolussion superiore. File:Alpha Centauri relative sizes.png → File:Alpha Centauri relative sizes.svg Par savérghene piassè su la grafica vetoriale lèzi: Commons:conversion a SVG. Ghe xe anca informassion de suporto a le imagini SVG in MediaWiki. In other languages ([//commons.wikimedia.org/w/index.php?title=Template:In_other_languages&action=edit translate this]) Alemannisch ∙ Bahasa Indonesia ∙ Bahasa Melayu ∙ British English ∙ català ∙ čeština ∙ dansk ∙ Deutsch ∙ eesti ∙ English ∙ español ∙ Esperanto ∙ euskara ∙ français ∙ Frysk ∙ galego ∙ hrvatski ∙ Ido ∙ italiano ∙ lietuvių ∙ magyar ∙ Nederlands ∙ norsk bokmål ∙ norsk nynorsk ∙ occitan ∙ Plattdüütsch ∙ polski ∙ português ∙ português do Brasil ∙ română ∙ Scots ∙ sicilianu ∙ slovenčina ∙ slovenščina ∙ suomi ∙ svenska ∙ Tiếng Việt ∙ Türkçe ∙ vèneto ∙ Ελληνικά ∙ беларуская (тарашкевіца) ∙ български ∙ македонски ∙ нохчийн ∙ русский ∙ српски / srpski ∙ татарча/tatarça ∙ українська ∙ ქართული ∙ հայերեն ∙ বাংলা ∙ தமிழ் ∙ മലയാളം ∙ ไทย ∙ 한국어 ∙ 日本語 ∙ 简体中文 ∙ 繁體中文 ∙ עברית ∙ العربية ∙ فارسی ∙ +/−

 

David Benbennick made this image on January 29, 2005 with the following Metapost program as stars.mp:

verbatimtex
\font\foo=cmss9 at 10pt
\foo
etex

sunrad=0.3in;
alpharad = 1.227*sunrad;
betarad = 0.865*sunrad;
proximarad = 0.145*sunrad;
gap = 0.8*sunrad;

pair sunpos, alphapos, betapos, proximapos;
sunpos = (0 + gap + sunrad, 1.9*sunrad);
alphapos = sunpos + (sunrad + gap + alpharad, 0);
betapos = alphapos + (alpharad + gap + betarad, 0);
proximapos = betapos + (betarad + gap + proximarad, 0);

beginfig(1);

  fill unitsquare xscaled ((xpart proximapos) + proximarad + gap)
    yscaled (2 * (ypart sunpos));

  fill fullcircle scaled (2*sunrad) shifted sunpos
    withcolor (1,0.960,0.949);   % Color is fff1ed
  label.bot(btex Sun etex, sunpos - (0, sunrad)) withcolor white;

  fill fullcircle scaled (2*alpharad)
    shifted alphapos
    withcolor (1,0.960,0.949);
  label.bot(btex $\alpha$ Centauri A etex, alphapos - (0, alpharad))
    withcolor white;

  fill fullcircle scaled (2*betarad)
    shifted betapos
    withcolor (1,0.878,0.737);  % ffe0bc
  label.bot(btex $\alpha$ Centauri B etex, betapos - (0, betarad))
    withcolor white;

  fill fullcircle scaled (2*proximarad)
    shifted proximapos
    withcolor (1,0.752,0.411);  % ffcc6f
  label.bot(btex Proxima etex, proximapos - (0, proximarad))
    withcolor white;

endfig;
end;

And I had the following TeX file as stars.tex:

%&latex
\documentclass[10pt]{article}
 \usepackage{graphicx}
 \pagestyle{empty}
\begin{document}
 \includegraphics{stars.1}
\end{document}

Then I ran

mpost stars
tex stars
dvips -mode ljfzzz -D 1200 stars -o
convert -density 1200 -chop 99999x99999+6249+3463 -chop 2479x2095 stars.ps stars.png
pngcrush -reduce -brute -l 9 stars.png stars.crush.png

stars.crush.png was the final output file.

(Apparently it's non-trivial to get dvips to use a given resolution. I would have preferred to use 1600 dpi, but dvips didn't already have a "printer" at that resolution. ljfzzz, at 1200, was the best I could find.)

Mi, che detegno el dirito d'autor su sta opera, la pùblico qua soto le seguenti license:

Se autorixa ła copia, distribusion y modifegasion de sto documento soto i termani de ła liçensa de documentasion libara GNU, version 1.2 o calsiasi altra version dopo, publegada da ła Fonsasion par el Software Libaro; sensa sesion invariabiłi, testi de coertina e njianca testi de contro-coertina. Se include na copia de ła pena dita liçensa in te ła sesion intitołada Liçensa de Documentasion Libara GNU.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue

	Sto file el xe soto ła liçensa Creative Commons Atribusion-Spartisi in te ła stesa manjiera 3.0 Xenèrego.
	Te si libaro: de spartire in jiro – de copiar, distribuir e trasmétar sta opera de modifegar – de adatar sta opera Soto le seguenti condision: atribussion – Te ghe da atribuir ƚa paternità de ƚ'opera ne i modi indicà de l'autor o da chi te gà dà l'opera en lisensa, e en modo tale da no sugerir che lori i sia d'acordo con ti o col modo che te dòpari l'opera. spartisi in te ła stesa manjiera – Se te mis-ci, trasformi o dexviłupi sto laoro, te ghè da spartire łe to contribusion segondo ła stesa liçensa o na conpatibiłe a l'orixenałe.
	Sto tag de copyright lo gavemo zontà ne l'ànbito de l'ajornamento de la licensa dei progeti Wikimedia.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue

Sto file el xe soto la licensa Creative Commons Atribusion-Condividi a lo stesso modo 2.0 Generico.

Te si libaro:

• de spartire in jiro – de copiar, distribuir e trasmétar sta opera
• de modifegar – de adatar sta opera

Soto le seguenti condision:

• atribussion – Te ghe da atribuir ƚa paternità de ƚ'opera ne i modi indicà de l'autor o da chi te gà dà l'opera en lisensa, e en modo tale da no sugerir che lori i sia d'acordo con ti o col modo che te dòpari l'opera.
• spartisi in te ła stesa manjiera – Se te mis-ci, trasformi o dexviłupi sto laoro, te ghè da spartire łe to contribusion segondo ła stesa liçensa o na conpatibiłe a l'orixenałe.

https://creativecommons.org/licenses/by-sa/2.0CC BY-SA 2.0 Creative Commons Attribution-Share Alike 2.0 truetrue

Te połi segnare ła liçensa che te prefarisi

References

• I took the star colors from [1], which indicates they're only approximate. Apparently there are inherent difficulties in representing a star's color on a computer monitor.
• I took the star radii from [2].

derivative works

Opere derivate da questo file:

• Alpha Centauri relative sizes-it.png
• Alpha Centauri relative sizes-nl.png
• Alpha Centauri relative sizes-sv.png