Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....50..343n&link_type=abstract
Astronomy and Astrophysics, vol. 50, no. 3, Aug. 1976, p. 343-352.
Astronomy and Astrophysics
Astrophysics
51
Abundance, B Stars, Helium, Main Sequence Stars, Star Clusters, Stellar Spectrophotometry, Atmospheric Composition, Galactic Structure, Interstellar Gas, Milky Way Galaxy, Photoelectric Emission, Stellar Atmospheres
Scientific paper
Seven groups of B-type stars - Sco-Cen, NGC 6231, LacOBI, OriOBIb, h + chi Per, CepOBIII, and field stars - were investigated photoelectrically to determine whether helium abundance is uniform in the solar neighborhood and in a region of the spiral arm of the Galaxy. Observations were performed using an echelle spectrometer in the narrow band index of the I (4026) of the He I-4026 line. A model-atmosphere analysis of I (4026) and the beta index of the H beta line shows that in the spectral range B O-B 2, the relation between I (4026) and beta is insensitive to differences in the surface gravity but sensitive to differences in the helium to hydrogen ratio. It is found that stars in the two groups most distant from the sun - h + chi Per and CepOBIII - have a lower helium abundance than stars in the solar neighborhood.
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