This is a list of semiregular variable stars. Variability ranges are taken from the General Catalogue of Variable Stars (GCVS) where these are visual magnitudes, otherwise from the International Variable Star Index (VSX). Spectral types are taken from the GCVS, which may differ from more recent MK spectral types but often defines a range.
Star Constellation Discovery Maximum (mV) Minimum (mV) Range Period (days)Spectral Type TypeComment θ Aps Apus 4m.65 6m.20 M7III SRb β And (Mirach) Andromeda 2m.01 2m.10 M0IIIa SRb suspectedZ AqrAquarius 7m.4 10m.2 M1e-M7III SRa V Aql Aquila 6m.6 8m.4 C5,4-C6,4(N6) SRb W Boö (Alrumh) Boötes 4m.49 5m.40 M2-M4III SRb: VZ Cam Camelopardalis 4m.80 4m.96 M4IIIa Lb in GCVS Y CVn (La Superba) Canes Venatici 4m.8 6m.3 C5,4J(N3) SRb one of the reddest stars visible to the unaided eye ρ Cas Cassiopeia L.D.Wells (1901) 4m.1 6m.2 F8pIa-K0pIa-0 SRd WZ Cas Cassiopeia 6m.3 8m.5 C9,2JLi(N1p) SRb Visual double star, visible through binoculars V806 Cen Centaurus 4m.16 4m.26 M5III SRb T Cen Centaurus 5m.5 9m.0 K0:e-M4II:e SRa classified as RV Tauri variable by some V810 Cen Centaurus 4m.95 5m.12 F5-G0Ia-0 SRd B1 Iab companion μ Cep (Herschel's Garnet Star) Cepheus (1782) 3m.43 5m.10 M2eIa SRc SS Cep Cepheus 6m.5 7m.7 M5III SRb AR Cep Cepheus 7m.0 7m.9 ~364 M4III SRb T Cet Cetus 4m.96 6m.90 M5-6SIIe SRc T Cnc Cancer Hind (1850) 7m.6 10m.5 C3,8-C5,5(R6-N6) SRb X Cnc Cancer 5m.69 6m.94 C5,4(N3) SRb RR CrBCorona Borealis 7m.3 8m.2 M3-M6 SRb W Cyg Cygnus 5m.10 6m.83 M4e-M6e(Tc:)III SRb AF CygCygnus 6m.4 7m.7 M5e-M7 SRb U Del Delphinus 6m.14 7m.61 M5II-III SRb EU Del Delphinus 5m.79 6m.9 M6.4III SRb η Gem (Propus) Gemini Schmidt (1865) 3m.15 3m.90 M3IIIab SRa also Algol eclipsing binary? α Her (Rasalgethi) Hercules (1759) 2m.74 4m.00 M5Ib-II SRc 30 Her Hercules 4m.3 6m.3 M6III SRb X Her Hercules 5m.8 7m.0 M6e SRb U Hya Hydra 4m.56 5m.40 ~450 C6.5,3(N2)(Tc) SRb RX Lep Lepus 5m.0 7m.4 ~60 M6.2III SRb σ Lib (Brachium) Libra 3m.20 3m.46 M5III SRb R Lyr Lyra 3m.88 5m.00 ~46 M5III SRb α Ori (Betelgeuse) Orion John Herschel (1840) 0m.0 1m.3 M1-M2Ia-Ibe SRc W Ori Orion 5m.5 6m.9 C5,4(N5) SRb CK Ori Orion 5m.9 7m.1 ~120 K2IIIe: probably not variable S Pav Pavo 6m.6 10m.4 M7IIe-M8III SRa GZ Peg Pegasus 4m.95 5m.23 M4SIII SRa ρ Per Perseus 3m.30 4m.00 ~50 M4IIb-IIIa SRb R Pic Pictor 6m.35 10m.10 M1IIe-M4IIe L2 Puppis Puppis 2m.6 6m.2 M5IIIe-M6IIIe SRb VX Sgr Sagittarius 6m.52 14m.00 M4eIa-M10eIa SRc one of the largest stars known η Scl Sculptor Cousins/Stoy (1962) 4m.8 4m.9 M4IIIa SRb τ4 Ser Serpens 5m.89 7m.07 M5IIb-IIIa SRb CE TauTaurus 4m.23 4m.54 M2Iab-Ib SRc SS VirVirgo 6m.0 9m.6 C6,3e(Ne) SRaSV UMaUrsa Major 9m.1 10m.6 G1Ibe-K3Iap SRd Z UMa Ursa Major 6m.2 9m.4 M5IIIe SRb RR UMi Ursa Minor 4m.44 4m.85 M5III SRb
See also Lists of astronomical objects Lists of stars List of stars that have unusual dimming periods Variable star designation
References