DY Persei
Encyclopedia
DY Persei is a variable star
in the Perseus
constellation, being a prototype star to the very rare type of DY Persei variable
s, that pulsate like red variables, but also fade from sight like R Coronae Borealis variable
s.
Variable star
A star is classified as variable if its apparent magnitude as seen from Earth changes over time, whether the changes are due to variations in the star's actual luminosity, or to variations in the amount of the star's light that is blocked from reaching Earth...
in the Perseus
Perseus (constellation)
Perseus is a constellation in the northern sky, named after the Greek hero Perseus. It was one of the 48 constellations listed by the 2nd century astronomer Ptolemy, and remains one of the 88 modern constellations defined by the International Astronomical Union...
constellation, being a prototype star to the very rare type of DY Persei variable
DY Persei variable
DY Persei variables are a subclass of R Coronae Borealis variables. They are carbon-rich asymptotic giant branch stars that exhibit pulsational variability of AGB stars and irregular variability of RCB stars....
s, that pulsate like red variables, but also fade from sight like R Coronae Borealis variable
R Coronae Borealis variable
A R Coronae Borealis variable is an eruptive variable star that varies in luminosity in two modes, one low amplitude pulsation , and one irregular unpredictably sudden fading by 1 to 9 magnitudes...
s.