irregular variable star

irregular variable star

[i′reg·yə·lər ¦ver·ē·ə·bəl ′stär]
(astronomy)
A star with no fixed period.
References in periodicals archive ?
Hind's Variable Nebula is usually visible as two or three faint arcs of nebulosity about 40" west or southwest of the irregular variable star, T Tauri, which varies erratically between magnitude 9 and 13.
Scan 7 1/2[degrees] east of Alkaid, into the northwestern corner of Bootes, where you'll find the irregular variable star CH Bootis, which fluctuates between magnitudes 5.
A subtle cometlike patch of nebulosity, C68 is lit by the irregular variable star R Coronae Australis.
In 1908 the programme consisted of 5 Algol, 9 short-period, 27 long-period and 9 irregular variable stars.