Light and colour variation of the Mira stars

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Late Stars, M Stars, Mira Variables, Ubv Spectra, Variable Stars, Graphs (Charts), Light Curve, Stellar Spectrophotometry, Tables (Data)

Scientific paper

A total of 3743 V, B-V and U-B photoelectric measurements of 60 Mira-type variable stars, mainly in the southern hemisphere, were made at the Cerro Tololo Inter-American Observatory during 14 observation periods, from December 1972 to March 1974. Light curves are given for each star based on a probable graphic interpolation as a function of time. Elements of each light and color curve are derived. The principal characteristics observed in the V curves are that the form of variation remains the same in each star and that there are groups of stars whose light curves are similar, even though the elements are not constant. The variation of the color indices is also analyzed, showing the most important properties.

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