Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...140..155s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 140, no. 1, Nov. 1984, p. 155-158.
Astronomy and Astrophysics
Astrophysics
Astronomical Photometry, Galaxies, Spectrophotometry, Ubv Spectra, Color, Elliptical Galaxies, Error Analysis, Red Shift
Scientific paper
Recent claims that there exist certain intrinsic relations between Stromgren indices and redshift values of elliptic galaxies and of N-galaxies are investigated. Synthetic colors in the rest system of the respective galaxies are estimated from spectrophotometric surveys, with the result that none of the alleged trends in the (b-y) and m(1) indices of these galaxies can be confirmed. At present, no discrimination appears possible between N-galaxies, 'active ellipticals', and 'standard candles' using Stromgren indices only, nor does the m(1) index give a measure of the metallicity in these objects. Finally, problems arising from the calibration of absolute spectrophotometry at near-infrared wavelengths and from chance effects such as light variability and reddening are pointed out.
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