Exploring the properties of the DDO system using synthetic colors

Details Exploring the properties of the DDO system using synthetic colors Exploring the properties of the DDO system using synthetic colors

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....102..744t&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 102, Aug. 1991, p. 744-762.

Astronomy and Astrophysics

Astronomy

30

Dwarf Stars, Optical Filters, Stellar Color, Stellar Models, Astronomical Catalogs, Color-Color Diagram, Giant Stars, Line Spectra, Stellar Composition

Scientific paper

The properties of the David Dunlap Observatory (DDO) system (which uses bandpasses centered at about 3450, 3800, 4180, 4250, 4500, 4850, and 5150 A, referred to as 35, 38, 41, 42, 45, 48, and 51 filters) are explored by applying synthetic colors. Using DDO colors for a sample of stars for which spectrophotometric data were reported by Gunn and Stryker (1983), the correctness of the transmission profiles of the filters was established. It is shown that the presence of MgH lines in the 48 bandpass is an important reason why cool dwarfs and giants are separated in the C(45-48) vs C(42-45) diagram. It was found that including SiH lines in the spectra improved the agreement between observed and computed C(41-45) colors for dwarfs.

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