The problem of age-related and spatial variations of the helium abundance in the Galactic disk

Details The problem of age-related and spatial variations of the helium abundance in the Galactic disk The problem of age-related and spatial variations of the helium abundance in the Galactic disk

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pazh...16..619k&link_type=abstract

Pis'ma v Astronomicheskii Zhurnal (ISSN 0320-0108), vol. 16, July 1990, p. 619-624. In Russian. In Russian. In Russian.

Astronomy and Astrophysics

Astronomy

Abundance, B Stars, Helium, Milky Way Galaxy, Stellar Atmospheres, Astronomical Catalogs, Astronomical Photometry, Astronomical Spectroscopy, Line Spectra, Spatial Distribution

Scientific paper

Data from the Main Stellar Spectrograph of the 6-meter telescope indicate that the average He abundance for stars with Te greater than 16,000 K is the same for field stars and for star members of open clusters. From a study of the B-star members of 18 open clusters, it is concluded that age-related (on a scale of 1-100 Myr) and spatial (at a distance of about 3 kpc) variations of the average helium abundance are absent.

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