Helium-weak stars are chemically peculiar stars which have a weak helium lines for their spectral type.[1] [2] Their helium lines place them in a later (i.e. cooler) spectral type then their hydrogen lines.[3]
This is a non-extensive list of helium-weak stars.[4] [5]
| Star Name | Constellation | Apparent Magnitude (mv) | Class | Notes |
|---|---|---|---|---|
| 20 Eridani (EG Eridani) | 5.23 | B8/9 III | α2 CVn variable | |
| 30 Capricorni | Capricornus | 5.38 | B5 II/III | |
| 5.50 | B8 III/IV | Suspected Binary; | ||
| 22 Eridani (FY Eridani) | 5.53 | B9 IIIpSi (4200) | α2 CVn variable | |
| HD 74196 | Vela | 5.61 | B7 Vn | Part of IC 2391 |
| HD 28843 (DZ Eridani) | 5.81 | B9 III | SX Arietis variable | |
| 12 Canis Majoris (HK Canis Majoris) | 6.08 | B7 II/III | SX Arietis variable | |
| HD 34797 (TX Leporis) | 6.54 | B7 Vp | α2 CVn variable
| |
| Orion | 6.95 | B9 II/III | Binary | |
A related class of stars have anomalously strong helium lines in their spectra, and are known as helium-strong stars.[1]