Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apjs...49..273b&link_type=abstract
Astrophysical Journal Supplement Series, vol. 49, June 1982, p. 273-291.
Astronomy and Astrophysics
Astrophysics
9
Binary Stars, Dwarf Stars, Giant Stars, Stellar Spectra, Stellar Spectrophotometry, Balmer Series, Calibrating, Computer Programs, Eclipsing Binary Stars, G Stars, H Gamma Line, Line Spectra, Scanners, Stellar Luminosity
Scientific paper
A set of line and continuum indices is calibrated as a function of spectral type, over the range late O-early G for giants, using low resolution scanner observations in the 3500-4400 A region. Line or feature indices are defined for H-gamma, G band, Ca I (4227 A), Ca II (K), H 3889, and the Balmer jump. The combination of the results with those for standard-luminosity class IV-V stars allows the analysis of composite-spectrum objects. The spectrum scans of 58 visual, spectroscopic and eclipsing pairs are compared with a grid of calculated composites, and a computer program is used to generate giant-giant, giant-dwarf and dwarf-dwarf pairs of composites for comparison with observations. A set of 11 dwarf stars treated in Beavers and Cook (1980) is reexamined using a version of the computer program which fixes Delta(m) for the synthesis procedure to agree with values found in the literature.
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