Astronomy:Helium-weak star

From HandWiki

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 (ie. 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]

  • HR 939
  • HR 1100
  • HR 1121
  • HR 1441
  • HR 2509
  • HR 3448
  • HR 4801
  • HR 8137
  • Theta Hydri
  • HD 34797
  • HD 35456

See also

References

  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. https://www.cambridge.org/core/journals/symposium-international-astronomical-union/article/div-classtitleabundance-and-magnetic-field-geometries-of-helium-strong-and-helium-weak-starsdiv/6D7A782B53D786BEA022B5FFF4F1872E#. 
  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". https://ned.ipac.caltech.edu/level5/Gray/Gray9.html. 
  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.