Astronomy:Helium-weak star

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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]

List of helium-weak stars

This is a non-extensive list of helium-weak stars.[4][5]

Caption text
Star Name Constellation Apparent Magnitude (mv) Class Notes
20 Eridani (EG Eridani) Eridanus 5.23 B8/9 III α2 CVn variable
30 Capricorni Capricornus 5.38 B5 II/III
θ Hydri Hydrus 5.50 bgcolor="Template:Color temperature"| B8 III/IV Suspected Binary;
22 Eridani (FY Eridani) Eridanus 5.53 B9 IIIpSi (4200) α2 CVn variable
HD 74196 Vela 5.61 B7 Vn Part of IC 2391
HD 28843 (DZ Eridani) Eridanus 5.81 bgcolor="Template:Color temperature"| B9 III SX Arietis variable
12 Canis Majoris (HK Canis Majoris) Canis Major 6.08 bgcolor="Template:Color temperature"| B7 II/III SX Arietis variable
HD 34797 (TX Leporis) Lepus 6.54 B7 Vp α2 CVn variable; binary
HD 35456 Orion 6.95 B9 II/III Binary

Helium-strong star

A related class of stars have anomalously strong helium lines in their spectra, and are known as helium-strong stars.[1]

See also


  1. 1.0 1.1 Landstreet, J. D.; Bohlender, David A. (1988). "Abundance and Magnetic Field Geometries of Helium-Strong and Helium-Weak Stars" (in en). Symposium - International Astronomical Union 132: 309–312. doi:10.1017/S0074180900035191. ISSN 0074-1809. Bibcode1987BAAS...19..704B. 
  2. Preston, George W. (1974). "The Chemically Peculiar Stars of the Upper Main Sequence". Annual Review of Astronomy and Astrophysics 12 (1): 257–277. doi:10.1146/annurev.aa.12.090174.001353. Bibcode1974ARA&A..12..257P. 
  3. "A Digital Spectral Classification Atlas - R. O. Gray". 
  4. Jaschek, Mercedes; Jaschek, Carlos; Arnal, Marcelo (October 1969). "Helium-Weak Stars". Publications of the Astronomical Society of the Pacific 81 (482): 651. doi:10.1086/128832. Bibcode1969PASP...81..650J. 
  5. Alonso, M. S.; López-García, Z.; Malaroda, S.; Leone, F. (April 2003). "Elemental abundance studies of CP stars. The helium-weak stars HD 19400, HD 34797 and HD 35456*". Astronomy and Astrophysics 402: 331. doi:10.1051/0004-6361:20030222. Bibcode2003A&A...402..331A.