S star variable

S star variable

"Slow irregular variables. The light variations of these stars show no evidence of periodicity, or any periodicity present is very poorly defined and appears only occasionally. Like for the type I, stars are often attributed to this type because of being insufficiently studied. Many type L variables are really semiregulars or belong to other types."

"Irregular variable supergiants of late spectral types having amplitudes of about 1 mag in V (TZ Cas)." [http://www.alcyone.de/cgi-bin/search.pl?object=HR1939]


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