List of semiregular variable stars
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 | Type | Comment |
|---|---|---|---|---|---|---|---|---|---|
| θ Aps | Apus | 4m.65 | 6m.20 | 1.55 | 119 | M7III | SRb | ||
| β And (Mirach) | Andromeda | 2m.01 | 2m.10 | 0.09 | 119 | M0IIIa | SRb | suspected | |
| Z Aqr | Aquarius | 7m.4 | 10m.2 | 2.8 | 136.6 | M1e-M7III | SRa | ||
| V Aql | Aquila | 6m.6 | 8m.4 | 1.8 | 353 | C5,4-C6,4(N6) | SRb | ||
| W Boö | Boötes | 4m.49 | 5m.40 | 0.67 | 450 | M2-M4III | SRb: | ||
| VZ Cam | Camelopardalis | 4m.80 | 4m.96 | 0.16 | 23.7 | M4IIIa | Lb in GCVS | ||
| Y CVn (La Superba) | Canes Venatici | 4m.8 | 6m.3 | 1.5 | 160 | 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 | 2.1 | 320 | F8pIa-K0pIa-0 | SRd | |
| WZ Cas | Cassiopeia | 6m.3 | 8m.5 | 2.2 | C9,2JLi(N1p) | SRb | Visual double star, visible through binoculars | ||
| V806 Cen | Centaurus | 4m.16 | 4m.26 | 0.1 | 12 | M5III | SRb | ||
| T Cen | Centaurus | 5m.5 | 9m.0 | 3.5 | 90.44 | K0:e-M4II:e | SRa | classified as RV Tauri variable by some | |
| V810 Cen | Centaurus | 4m.95 | 5m.12 | 0.17 | 130 | F5-G0Ia-0 | SRd | B1 Iab companion | |
| μ Cep (Herschel's Garnet Star) | Cepheus | William Herschel (1782) | 3m.43 | 5m.10 | 1.67 | 730 | M2eIa | SRc | |
| SS Cep | Cepheus | 6m.5 | 7m.7 | 1.2 | 90 | M5III | SRb | ||
| AR Cep | Cepheus | 7m.0 | 7m.9 | 0.9 | ~364 | M4III | SRb | ||
| T Cet | Cetus | 4m.96 | 6m.90 | 1.94 | 159 | M5-6SIIe | SRc | ||
| T Cnc | Cancer | Hind (1850) | 7m.6 | 10m.5 | 2.9 | 482 | C3,8-C5,5(R6-N6) | SRb | |
| X Cnc | Cancer | 5m.69 | 6m.94 | 1.25 | 180 | C5,4(N3) | SRb | ||
| RR CrB | Corona Borealis | 7m.3 | 8m.2 | 0.9 | 60.8 | M3-M6 | SRb | ||
| W Cyg | Cygnus | 5m.10 | 6m.83 | 1.73 | 131 | M4e-M6e(Tc:)III | SRb | ||
| AF Cyg | Cygnus | 6m.4 | 7m.7 | 1.3 | 92.5 | M5e-M7 | SRb | ||
| U Del | Delphinus | 6m.14 | 7m.61 | 1.47 | 110 | M5II-III | SRb | ||
| EU Del | Delphinus | 5m.79 | 6m.9 | 1.11 | 59.7 | M6.4III | SRb | ||
| η Gem (Propus) | Gemini | Schmidt (1865) | 3m.15 | 3m.90 | 0.75 | 233 | M3IIIab | SRa | also Algol eclipsing binary? |
| α Her (Rasalgethi) | Hercules | William Herschel (1759) | 2m.74 | 4m.00 | 1.26 | M5Ib-II | SRc | ||
| 30 Her | Hercules | 4m.3 | 6m.3 | 2.0 | 89.2 | M6III | SRb | ||
| X Her | Hercules | 5m.8 | 7m.0 | 1.1 | 95.0 | M6e | SRb | ||
| U Hya | Hydra | 4m.56 | 5m.40 | 2.4 | ~450 | C6.5,3(N2)(Tc) | SRb | ||
| RX Lep | Lepus | 5m.0 | 7m.4 | 2.4 | ~60 | M6.2III | SRb | ||
| σ Lib (Brachium) | Libra | 3m.20 | 3m.46 | 0.26 | 20 | M5III | SRb | ||
| R Lyr | Lyra | 3m.88 | 5m.00 | 1.12 | ~46 | M5III | SRb | ||
| α Ori (Betelgeuse) | Orion | John Herschel (1840) | 0m.0 | 1m.3 | 1.3 | 2,335 | M1-M2Ia-Ibe | SRc | |
| W Ori | Orion | 5m.5 | 6m.9 | 4.2 | 212 | C5,4(N5) | SRb | ||
| CK Ori | Orion | 5m.9 | 7m.1 | 1.2 | ~120 | K2IIIe: | probably not variable | ||
| S Pav | Pavo | 6m.6 | 10m.4 | 3.8 | 381 | M7IIe-M8III | SRa | ||
| GZ Peg | Pegasus | 4m.95 | 5m.23 | 0.28 | 92.66 | M4SIII | SRa | ||
| ρ Per | Perseus | 3m.30 | 4m.00 | 0.70 | ~50 | M4IIb-IIIa | SRb | ||
| R Pic | Pictor | 6m.35 | 10m.10 | 3.75 | 171 | M1IIe-M4IIe | |||
| L2 Puppis | Puppis | 2m.6 | 6m.2 | 3.6 | 141 | M5IIIe-M6IIIe | SRb | ||
| VX Sgr | Sagittarius | 6m.52 | 14m.00 | 7.08 | 732 | M4eIa-M10eIa | SRc | one of the largest stars known | |
| η Scl | Sculptor | Cousins/Stoy (1962) | 4m.8 | 4m.9 | 0.1 | M4IIIa | SRb | ||
| τ4 Ser | Serpens | 5m.89 | 7m.07 | 1.18 | 100 | M5IIb-IIIa | SRb | ||
| CE Tau | Taurus | 4m.23 | 4m.54 | 0.31 | 165 | M2Iab-Ib | SRc | ||
| SS Vir | Virgo | 6m.0 | 9m.6 | 3.6 | 364.14 | C6,3e(Ne) | SRa | ||
| SV UMa | Ursa Major | 9m.1 | 10m.6 | 3.2 | 76 | G1Ibe-K3Iap | SRd | ||
| Z UMa | Ursa Major | 6m.2 | 9m.4 | 3.2 | 196 | M5IIIe | SRb | ||
| RR UMi | Ursa Minor | 4m.44 | 4m.85 | 0.41 | 43.3 | M5III | SRb |