Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.220.1003b&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 220, June 15, 1986, p. 1003-1020. SERC-supported resear
Astronomy and Astrophysics
Astronomy
35
Early Stars, Galactic Clusters, Main Sequence Stars, Southern Sky, Stellar Composition, Stellar Spectrophotometry, Absorption Spectra, Angular Velocity, Chemical Composition, Helium, Hydrogen, Line Spectra, Spectral Line Width, Thermodynamic Equilibrium
Scientific paper
Seventy-one early-type main-sequence stars have been observed spectroscopically in five southern galactic clusters and a loose association. Hydrogen-line profiles and helium-diffuse-line equivalent widths have been measured for all stars, together with line strengths for metal and helium nondiffuse lines in 27 stars with small projected rotational velocities. Stromgren photometry has been obtained for stars where previous results do not exist, and effective temperatures have been determined from the index. Surface gravities have been estimated primarily from theoretical profiles fitted to the H-delta absorption line, and also from H-beta photometry. Abundances, deduced from comparison with LTE and non-LTE model-atmosphere calculations, are generally found to be consistent with a normal early-type stellar composition.
Brown Paul J. F.
Dufton Philip L.
Keenan Francis P.
Lennon Daniel J.
No associations
LandOfFree
The chemical composition of six southern clusters and associations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The chemical composition of six southern clusters and associations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The chemical composition of six southern clusters and associations will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1833831