Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...145..433v&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 145, no. 2, April 1985, p. 433-438.
Astronomy and Astrophysics
Astrophysics
18
Elliptical Galaxies, Star Formation, Balmer Series, Electrophotometry, Hot Stars, Ubv Spectra, Ultraviolet Spectroscopy
Scientific paper
Photometric and spectroscopic observations are presented for a complete sample of 320 giant elliptical and SO galaxies from the Revised Shapely Ames catalog. The observations were carried out using the Image Detector Scanner and Boller and Chivens spectrograph attached to the 1.52-m ESO telescope. The dispersion of the observations was 171 A/mm, and the resolution was 10 A (FWHM). The wavelength range common to all deredshifted spectra was 4310-6930 A. The observations show a well defined correlation between the U-B and B-V colors of the galaxies. The three bluest galaxies showed stronger Balmer absorption lines in their spectra than the mean elliptical, indicating the presence of hot stars. The possibility that the hot stars are also young stars rather than members of a horizontal branch is also considered.
Véron Pascal
Veron-Cetty M.-P.
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