Astronomy and Astrophysics – Astronomy
Scientific paper
May 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....95.1484b&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 95, May 1988, p. 1484-1493.
Astronomy and Astrophysics
Astronomy
21
Cool Stars, Dwarf Stars, F Stars, Hubble Space Telescope, Stellar Color, Stellar Spectrophotometry, Calibrating, Globular Clusters, Subdwarf Stars
Scientific paper
Recent synthetic spectrum and color calculations for cool dwarf star models are tested by comparison with observation. First, the accuracy of the computed dependence of the thermal colors B-V and b-y on effective temperature is examined. Secondly, Hβ indices are presented and compared with observed values. Thirdly, the accuracy of the predictions of the Strömgren uvby system metal-abundance indicator m1 and the luminosity indicator c1 are tested. A new calibration of the c1, b-y diagram in terms of absolute magnitudes is given, making use of recent calculations of stellar isochrones. Some comments are made about the development of a Strömgren type system using filters from the Wide Field Camera on the Hubble Space Telescope. Finally, observations of very metal-poor subdwarfs are used to study the accuracy of the isochrones.
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