Multiplicity Among Massive Stars

Computer Science

Scientific paper

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Scientific paper

Multiwavelength observations as exemplified by NASA's Great Observatories have provided a far clearer picture of the frequency of multiplicity in star systems. Cepheids (typically 5 Msun) are good representatives of massive stars. It is frequently the case that a third star is not apparent until the second star can be directly observed. As an example, the spectra of hot secondaries in Cepheid systems can be obtained in the satellite ultraviolet. In a number of ways (to be illustrated) this has provided evidence of a third star. In a recent compilation of the best studied ``binary'' Cepheid systems, 44 percent are in fact triple systems.

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