Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apjs...60..879c&link_type=abstract
Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 60, March 1986, p. 879-891. Research supported by the Pontificia
Astronomy and Astrophysics
Astrophysics
16
Late Stars, Red Dwarf Stars, Stellar Spectra, Stellar Spectrophotometry, Ubv Spectra, Variable Stars, Astronomical Catalogs, Data Reduction, Electrophotometry, M Stars, Mira Variables, Spectrum Analysis, Stellar Color
Scientific paper
A total of 50 Mira- and SR-type red variable stars were observed by means of the photoelectric photometry UBVRI Kron-Cousins system. In addition, 15 nearby red dwarf stars having spectral subtypes similar to those of Mira stars at maximum were observed in order to show that the conversion of the natural system into the Landolt (1983) standard system can be made for stars as red as the Mira variables, in spite of the shortage of standard late M-type stars. The relationship function and spectral type-color index scale on the Johnson system was converted into the present system. By means of VRI photometry, the spectral subtype can immediately be determined in different phases of the light curve. SR variables have the same color indices and spectral subclasses as Mira variables.
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