Characteristics of Stars
... Classification • H-R diagram • Absolute magnitude vs. temperature • For most stars the brightness increases as surface temp increases • Main sequence stars are band in center ...
... Classification • H-R diagram • Absolute magnitude vs. temperature • For most stars the brightness increases as surface temp increases • Main sequence stars are band in center ...
Section 2
... temperature is based on the color of the star • Blue or blue white is the hottest and red is the coolest ...
... temperature is based on the color of the star • Blue or blue white is the hottest and red is the coolest ...
Stars
... The sun is a star. With the exception of the sun, stars appear to be fixed, maintaining the same pattern in the skies year after year. However, stars are actually in rapid motion, but their distances are so great that their relative changes in position become apparent only over the centuries. The nu ...
... The sun is a star. With the exception of the sun, stars appear to be fixed, maintaining the same pattern in the skies year after year. However, stars are actually in rapid motion, but their distances are so great that their relative changes in position become apparent only over the centuries. The nu ...
Gemini
... cubic parsec. Some authors have estimated a larger diameter of up to 46' (H. Shapley in 1930). With about 100 million years (WEBDA gives a value 95, the Sky Catalogue 2000.0 of 110 million years), it is of intermediate age, and contains some post-main sequence stars (including several yellow and ora ...
... cubic parsec. Some authors have estimated a larger diameter of up to 46' (H. Shapley in 1930). With about 100 million years (WEBDA gives a value 95, the Sky Catalogue 2000.0 of 110 million years), it is of intermediate age, and contains some post-main sequence stars (including several yellow and ora ...
22.2 Stars Change Over Their Life Cycles
... Nebula: cloud of gas and dust in which stars may form ...
... Nebula: cloud of gas and dust in which stars may form ...
Star catalogue
A star catalogue, or star catalog, is an astronomical catalogue that lists stars. In astronomy, many stars are referred to simply by catalogue numbers. There are a great many different star catalogues which have been produced for different purposes over the years, and this article covers only some of the more frequently quoted ones. Star catalogues were compiled by many different ancient peoples, including the Babylonians, Greeks, Chinese, Persians, and Arabs. Most modern catalogues are available in electronic format and can be freely downloaded from NASA's Astronomical Data Center.Completeness and accuracy is described by the weakest apparent magnitude V (largest number) and the accuracy of the positions.