Three colour observations of southern red variable giant stars

Details Three colour observations of southern red variable giant stars Three colour observations of southern red variable giant stars

May 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26as...44..273w&link_type=abstract

Astronomy and Astrophysics Supplement Series, vol. 44, May 1981, p. 273-303.

Astronomy and Astrophysics

Astrophysics

11

Color, Red Giant Stars, Stellar Spectrophotometry, Variable Stars, Carbon Stars, Light Curve, M Stars, Southern Sky, Stellar Luminosity, Stellar Magnitude, Ubv Spectra

Scientific paper

UBV observations have been made of southern red variables of various types over a period of two years. Accurate light curves of about 35 variables have been obtained; in many cases the observations covered more than one cycle. It appears that the M-type SRb and Lb variables define a curved strip in the (B-V)-(U-B) plane. The mean (U-B) of the variable stars is about 0.5 mag bluer than the (U-B) of the nonvariable K-type giants. The red variables may be divided into different groups: the carbon stars and the M-type variables, of which the M-type stars are again to be divided into three groups on the basis of their color variations and consequently their loops in the two-color plane.

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