Danasîn

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

File:Alpha Centauri relative sizes.svg is a vector version of this file. It should be used in place of this PNG file when not inferior. File:Alpha Centauri relative sizes.png → File:Alpha Centauri relative sizes.svg For more information, see Help:SVG. In other languages 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.)

I, the copyright holder of this work, hereby publish it under the following licenses:

Ev dosye di bin Lîsansa Belgekirina Azad a GNU hate barkirin. Kopîkirin, belavkirin û guhartin di bin qebûlkirinên lîsansa GNU de ye, versiyona 1.2 versiyoneke kevintirîn a belavkirinê ya ji bo Weqfa Nivîsbara Azad, tê qebûlkirin. Kopyeyek lîsanse di beşa bi sernavê Lîsansa Belgekirina Azad a GNUde cî digre.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue

	Ev pel di bin lîsansa Creative Commons Attribution-Share Alike 3.0 Unported de lîsanskirî ye.
	Tu azad î: parve bike – ji bo kopîkirin, belavkirin û weşandina xebatê ji bo guhartin û adaptekirina naverokê – ji bo adaptekirina xebatê Di bin van mercan de: isnad – Divê tu isnadeke maqûl bikî, lînekek pêşkêş bikî ji bo lîsansê, û diyar bikî ku guhartin hatiye kirin an na. Tu dikarî vê yekê bi adilî bi cih bînî, lê ne bi awayê ku wekî lîsansor te an bikaranîna te pejirandibe. parvekirinê mîna hev – Ger tu materyalê biguherînî, bizivirînî formeke din, an ava bikî divê beşdariyên xwe di bin eynî lîsansê an lîsansa hevaheng de wekî ya eslî belav bikî.
	This licensing tag was added to this file as part of the GFDL licensing update.http://creativecommons.org/licenses/by-sa/3.0/CC BY-SA 3.0Creative Commons Attribution-Share Alike 3.0truetrue

This file is licensed under the Creative Commons Attribution-Share Alike 2.0 Generic license.

Tu azad î:

• parve bike – ji bo kopîkirin, belavkirin û weşandina xebatê
• ji bo guhartin û adaptekirina naverokê – ji bo adaptekirina xebatê

Di bin van mercan de:

• isnad – Divê tu isnadeke maqûl bikî, lînekek pêşkêş bikî ji bo lîsansê, û diyar bikî ku guhartin hatiye kirin an na. Tu dikarî vê yekê bi adilî bi cih bînî, lê ne bi awayê ku wekî lîsansor te an bikaranîna te pejirandibe.
• parvekirinê mîna hev – Ger tu materyalê biguherînî, bizivirînî formeke din, an ava bikî divê beşdariyên xwe di bin eynî lîsansê an lîsansa hevaheng de wekî ya eslî belav bikî.

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

Tu dikarî lîsansa ku tu dixwazî hilbijêrî.

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

Derivative works of this file:

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