| ActChr | - Active chromospheric stars |
| AeBe | - Herbig Ae/Be stars |
| Be | - Be stars |
| CSM | - Stars with circumstellar material |
| Catacl | - Cataclysmic stars |
| DN | - Dwarf novae |
| Flare | - Flare stars |
| Flx-St | - Flux standard stars |
| HyperG | - Hyper giant stars |
| ISM | - Stars used to study the interstellar medium |
| ISM-Dbl | - Double stars used to study the ISM |
| ISM-a | - Stars used to study the ISM around EZ-CMa |
| ISM-b | - Stars used to study the ISM around HD45677 |
| ISM-c | - Stars used to study the ISM around V1974-Cyg |
| IntBin | - Interacting binaries |
| LRV | - Luminous red variables |
| LRV-Lb | - LRV subclass Lb |
| LRV-Lc | - LRV subclass Lc |
| LRV-M | - LRV subclass M stars |
| LRV-SRa | - LRV semi-regular subclass a |
| LRV-SRb | - LRV semi-regular subclass b |
| LRV-SRc | - LRV semi-regular subclass c |
| Nova | - Novae |
| OBsg | - OB supergiant stars |
| Oe/Be | - Oe/Be stars |
| PN | - Planetary nebulae |
| Pol-St | - Polarization standard stars |
| PreMS | - Pre-Main sequence stars |
| PrePN | - Pre-Planetary nebula stars |
| RCrb | - R-Crb type stars |
| RSCVn | - RS-CVn type stars |
| RV-Tau | - RV-Tau type stars |
| RV-TauA | - RV-Tau subclass A stars |
| RV-TauB | - RV-Tau subclass B stars |
| RV-TauC | - RV-Tau subclass C stars |
| RapRot | - Rapidly rotating stars |
| ReflNeb | - Reflection nebulae |
| Sol-Sys | - Targets within the solar system |
| Symb | - Symbiotic stars |
| TTau | - T-Tau type stars |
| Unpol | - Unpolarized standard stars |
| WR | - Wolf-Rayet stars |
| WUMa | - W-UMa type stars |
| XRTr | - X-Ray mass transfer binaries |
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