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2. Color–color diagram - Wikipedia

   en.wikipedia.org/wiki/Color–color_diagram

   As such, color-color diagrams can be used as a means of representing the stellar population, much like a Hertzsprung–Russell diagram, and stars of different spectral classes will inhabit different parts of the diagram. This feature leads to applications within various wavelength bands.

3. Star coloring - Wikipedia

   en.wikipedia.org/wiki/Star_coloring

   The star chromatic number ⁠ ⁠ of G is the fewest colors needed to star color G. One generalization of star coloring is the closely related concept of acyclic coloring, where it is required that every cycle uses at least three colors, so the two-color induced subgraphs are forests. If we denote the acyclic chromatic number of a graph G by ...

4. Stellar isochrone - Wikipedia

   en.wikipedia.org/wiki/Stellar_isochrone

   In stellar evolution, an isochrone is a curve on the Hertzsprung-Russell diagram, representing a population of stars of the same age but with different mass. [1] The Hertzsprung-Russell diagram plots a star's luminosity against its temperature, or equivalently, its color. Stars change their positions on the HR diagram throughout their life.

5. Dia (software) - Wikipedia

   en.wikipedia.org/wiki/Dia_(software)

   Dia has special objects to help draw entity-relationship models, Unified Modeling Language (UML) diagrams, flowcharts, network diagrams, and simple electrical circuits. It is also possible to add support for new shapes by writing simple XML files, using a subset of Scalable Vector Graphics (SVG) to draw the shape.

6. UBV photometric system - Wikipedia

   en.wikipedia.org/wiki/UBV_photometric_system

   The apparent magnitudes of stars in the system are often used to determine the color indices B−V and U−B, the difference between the B and V magnitudes and the U and B magnitudes respectively. [1] The system is defined using a set of color optical filters in combination with an RMA 1P21 photomultiplier tube. [2]

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8. Celestia - Wikipedia

   en.wikipedia.org/wiki/Celestia

   Typical DSO survey in Celestia. Celestia versions 1.6.3 and under display the Hipparcos Catalogue (HIP) of 118,322 stars and a compiled catalogue of galaxies, while version 1.7.0 includes stars from the Tycho-2 Catalogue alongside the Hipparcos stars, with some data from Gaia, increasing the star count to over 2 million. [23]

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