सारांश:

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:

GNU Free Documentation Licenseका नीमआ अन्साऱ येइ कागजातलाई साद्द्या, बाण्ण्या रे/या फेलबदेल अद्द्या अनुमति दियीरैछ, Free Software Foundation बठेइ प्रकाशित भया: भर्जन १.२ या कोइलै नौलो भर्जन; बिना कोइ अपरिवर्तनीय धारा, फ्रन्ट कभर पाठ, रे ब्याक कभर पाठ सित। अनुमतियो यक प्रति GNU Free Documentation License शीर्षक भया: खण्डमी समाबेश अरीरैछ।http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue

	यै फाइलको आधिकारिकता निम्न अन्तर्गत निर्धारण गर्याछ । क्रिएटिभ कमन्स एलाइक ३.० अनपोर्टेड लाईसेंस ।
	तम खालि भया बाण – कार्यको प्रतिलिपि, वितरण र प्रेषितका लाइ मिस – कामको अनुशरण अद्दु तल दिया सर्तहरु अनुसार: एट्रिब्युसन – तमले निश्चित लेखक वा आधिकारिक व्यक्तिले निर्धारण गरया मान्यतामी आधारित होइबर ये कार्यलाई योगदान अद्दु सकंछौ( तर कोइलई सल्लाहकर्ताले आफ्नो इछ्या रे चाहना अनुसार अद्दु सक्दाईनन्)| शेयर अलाइक – यदि तम ये कार्यमी के निर्माण, परिवर्तन, रे थप अद्दु चाहन्छौ भन्या येले निर्धारण गर्या निश्चित आधिकारिक प्रारूप भित्र रई बटि मात्र अद्धु सकुन्छौ |
	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.

तम खालि भया

• बाण – कार्यको प्रतिलिपि, वितरण र प्रेषितका लाइ
• मिस – कामको अनुशरण अद्दु

तल दिया सर्तहरु अनुसार:

• एट्रिब्युसन – तमले निश्चित लेखक वा आधिकारिक व्यक्तिले निर्धारण गरया मान्यतामी आधारित होइबर ये कार्यलाई योगदान अद्दु सकंछौ( तर कोइलई सल्लाहकर्ताले आफ्नो इछ्या रे चाहना अनुसार अद्दु सक्दाईनन्)|
• शेयर अलाइक – यदि तम ये कार्यमी के निर्माण, परिवर्तन, रे थप अद्दु चाहन्छौ भन्या येले निर्धारण गर्या निश्चित आधिकारिक प्रारूप भित्र रई बटि मात्र अद्धु सकुन्छौ |

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

तम आफुना इच्छा अन्साऽरो अनुमतिपत्र छान्न सकन्छौ|

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