Astronomy and Astrophysics – Astrophysics
Scientific paper
1993-12-17
Astronomy and Astrophysics
Astrophysics
plain TeX, figures available upon request from held@lma02.bo.astro.it ; BAP#12-1993-043-OAB
Scientific paper
10.1086/116944
We present the results of spectroscopic observations of 10 nucleated dwarf elliptical galaxies (dE's) in the Fornax cluster. The blue spectra of Fornax dE galaxies indicate a wide range of metallicities at a given luminosity, similar to those of intermediate to \it metal-rich globular clusters. Metal abundances derived in this paper are well correlated with optical colors and agree with previous spectroscopic results. A discrepancy with metallicities inferred from infrared colors is evident; possible causes include an intermediate age population and dilution of spectral features by a blue light excess. Dwarf ellipticals exhibit a wide variation of hydrogen line strength which points to a complex star formation history. Prominent Balmer absorption lines are the signature of a young stellar population in the nuclei of some (but not all) dE's, while moderately strong Balmer lines in relatively metal-rich dE's are more consistent with an extended main sequence. The velocity distribution of the Fornax dwarfs is flatter than that of brighter galaxies at the 75\% confidence level, possibly indicating a difference in the kinematics of the two samples.
Held Enrico V.
Mould Jeremy R.
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