Bright red variables of large amplitude in the Magellanic Clouds

Details Bright red variables of large amplitude in the Magellanic Clouds Bright red variables of large amplitude in the Magellanic Clouds

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.212..955e&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 212, Feb. 15, 1985, p. 955-973.

Astronomy and Astrophysics

Astronomy

12

Magellanic Clouds, Red Giant Stars, Stellar Spectra, Variable Stars, Amplitude Distribution Analysis, Astronomical Photography, Mira Variables, Radial Velocity, Stellar Composition, Stellar Luminosity

Scientific paper

Periods and epochs of maximum light are given for 17 red variables in the Magellanic Clouds. Spectroscopic observations of six SMC variables of large amplitude confirm membership and show that a wide range of carbon and heavy element enrichment occurs: in particular two stars are of type CS. The high luminosity of these stars and the absence of stars with a similar moderate degree of carbon enrichment from the intermediate-age clusters is explicable in terms of stellar evolution theory. A new discussion of the Harvard data for bright red variables in both Magellanic Clouds confirms the presence of two groups, of high and intermediate mass, and indicates that stars in the latter group have M less than or equal to approximately 6 solar masses. The infrared colors show the same dependence on amplitude and on chemical composition as do those of red giant variables in the Galaxy. The large amplitude variables of high luminosity follow a linear relation in the log P-M(bol)diagram, with a slope steeper than that found for ordinary Mira variables in the LMC.

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