The 77-81 intermediate-band photometric system

Details The 77-81 intermediate-band photometric system The 77-81 intermediate-band photometric system

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97..923c&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 97, March 1989, p. 923-934.

Other

25

Astronomical Photometry, Carbon Stars, Infrared Photometry, Late Stars, M Stars, Absorption Spectra, Charge Coupled Devices, Color-Color Diagram, Electrophotometers, Spectral Bands, Stellar Luminosity, Titanium Oxides

Scientific paper

The 77-81 intermediate-band photometric color system for the study of late-type stars is defined. The passbands are centered on a region of TiO absorption at 7750 A (77) and on a region of CN absorption at 8100 A (81). Good agreement is found between measurements made on the 77-81 system with different detectors. The 77-81 color is well correlated with M type and reasonably correlated with carbon-richness class. The 77-81, V-I color-color diagram clearly distinguishes M and C types from other stars. It is also shown that the 77-81 color may be used to measure TiO band strength.

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