Other Main Sequences
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The simplicity and the importance of the results obtained for the main sequence suggest the extension of this concept to stars of quite different composition. We can then describe a main sequence as any sequence of homogeneous models with various masses M in complete equilibrium, consisting (mainly) of a certain element which burns in the central region. In this sense, the (normal) main sequence as treated before is a special case and is more precisely called the hydrogen main sequence (H-MS). In a further step of generalization, we will even drop the assumption of chemical homogeneity, thus arriving at the so-called generalized main sequences (§23.3,4). Of course, compared with the H-MS, the other sequences are far less important for real, observed stars. But their properties yield valuable information for understanding certain types of evolved stars, for example.
KeywordsRadiation Pressure Main Sequence Stellar Mass Linear Series Carbon Star
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