d:\valid\typelist.txt These variable types are present in the AAVSO Validation File (program star list). The type descriptions given here are very simple. Complete descriptions of variable star types may be found in the General Catalogue of Variable Stars, 4th edition. Qualifiers : - uncertain / - and, based on classification simultaneously by components, shape of light curve, and degree of filling of Roche lobes + - variable belongs to more than one type simultaneously Types * - unique; outside range of classification system ? - unstudied ACV - alpha CVn type rotating variable, strong magnetic field ACYG - alpha Cyg type pulsating variable AGN - active galactic nucleus; optically variable quasi-stellar extragalactic object [GCVS uses GAL] AM - AM Her (magnetic) eruptive variable (polar variable) BCEP - beta Cep type pulsating variable BLLAC - extragalactic BL Lac type object BY - BY Dra type rotating variable CEP - Cepheid type pulsating variable CEP(B) - displaying two or more simultaneously operating pulsation modes CWA - W Vir type with period > 8 days CWB - W Vir type with period < 8 days DCEP - delta Cep type; classical Cepheid DCEPS - light amplitude < 0.5 magnitude CST - non-variable (constant) star, formerly suspected of variability CV - cataclysmic (eruptive) variable DSCT - delta Sct type pulsating variable E - eclipsing binary system EA - Algol (beta Per) type EB - beta Lyr type EW - W UMa type ELL - ellipsoidal rotating variable DM - detached close binary eclipsing system KW - W UMa type contact close binary eclipsing system FU - FU Ori type eruptive irregular Orion variable GCAS - gamma Cas type eruptive irregular variable GRB - gamma ray burster GS - system with giant and/or supergiant component(s) I - irregular, poorly studied, unknown features IA - irregular, poorly studied, early spectral type IB - irregular, poorly studied, intermediate-late spectral type IN - Orion variable; irregular eruptive connected with diffuse nebulosity INA - early spectral type, Algol-like fading INB - intermediate-late spectral type, flares or Algol-like fading INS - rapid light changes observed INSA - early spectral type INSB - intermediate-late spectral type INST - T Tau type INT - T Tau type IS - rapid irregular variable, no apparent connection with diffuse nebulosity ISA - early spectral type ISB - intermediate-late spectral type IST - T Tau type L - irregular; periodicity absent, poorly defined, or insufficiently studied LB - slow, irregular late spectral type variables; also, slow red irregular variables of unknown spectral type LC - irregular variable late spectral type supergiants M - Mira type (long period) pulsating variable N - nova type eruptive system NA - fast rate of fading NB - slow rate of fading NC - remain at maximum light for 10+ years, very slow rate of fading NL - novalike NR - recurrent nova PN - close binary system including nucleus of planetary nebula PVTEL - PV Tel type pulsating variable QSO - quasi-stellar object (quasar) R - close binary system with strong reflection present RCB - R CrB type eruptive variable RR - RR Lyr type pulsating variable RRAB - asymmetric light curve RRC - nearly symmetric, sometimes sinusoidal, light curve RS - RS CVn type eruptive variable RV - RV Tau type pulsating variable RVA - does not vary in mean magnitude RVB - varies in mean magnitude with periodicity S - unstudied variable with rapid light changes SD - close binary eclipsing binary, semidetached system SDOR - S Dor type eruptive variable SEYFERT - Seyfert galaxay SN - supernova eruptive variable SR - semiregular pulsating variable SRA - giant with persistent periodicity SRB - giant with poorly expressed periodicity SRC - supergiant SRD - giant or supergiant with emission lines in spectrum SXARI - SX Ari type rotating variable SXPHE - SX Phe type pulsating variable UG - U Gem type eruptive variable (dwarf nova) UGSS - SS Cyg subtype UGSU - SU UMa subtype UGZ - Z Cam subtype UV - UV Cet type eruptive variable; flare star WD - close binary eclipsing system with white dwarf components WR - close binary eclipsing system with Wolf-Rayet star component X - x-ray source, close binary system with one component a hot, compact object XBP - x-ray burster, showing optical and x-ray bursts XI - x-ray irregular XJ - x-ray binary with relativistic jets evident in x-ray and radio XM - x-ray magnetic variable (AM Her type = polar) with no pulsar or reflection effect XN - x-ray novalike system XND - x-ray novalike system containing a dwarf or subgiant XNGP - x-ray novalike system containing a giant or supergiant and a pulsar XP - x-ray pulsar system XPM - x-ray magnetic variable (AM Her type = polar) with pulsar but no reflection effect XPNG - the same as XNGP XPR - x-ray pulsar system featuring presence of reflection effect ZAND - Z And (symbiotic) eruptive variable ZANDE - with eclipses ZZ - ZZ Cet type pulsating variable