Star formation history of early-type galaxies in low density environments. I. Nuclear line-strength indices

Details Star formation history of early-type galaxies in low density environments. I. Nuclear line-strength indices Star formation history of early-type galaxies in low density environments. I. Nuclear line-strength indices

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26as..130..251l&link_type=abstract

Astronomy and Astrophysics Supplement, v.130, p.251-265

Astronomy and Astrophysics

Astrophysics

41

Galaxies: Fundamental Parameters, Galaxies: Elliptical And Lenticular, Galaxies: Interactions, Galaxies: Evolution

Scientific paper

This paper is the first of a series \cite[(Longhetti et al. 1997a,b)]{lon97} dedicated to the study of the star formation history in early-type galaxies which show fine structures and/or signatures of interaction. It presents nuclear line-strength indices for a sample composed of 21 shell galaxies, from the \cite[Malin & Carter (1983)]{mal83} southern survey, and 30 members of isolated interacting pairs, from the \cite[Reduzzi & Rampazzo (1995)]{red95} catalogue, located in low density environments. The spectral range covers 3700 Angstroms < lambda < 5700 Angstroms at 2.1 Angstroms FWHM resolution. We measure 16 red (lambda > 4200 Angstroms) indices defined by the Lick Group. Measures have been transformed into the Lick-IDS ``standard'' system. The procedure has been tested on a set of 5 elliptical galaxies selected from the \cite[Gonzalez (1993)]{gon93} sample. We derive also three blue (lambda < 4200) indices, namely Delta (4000 Angstroms) defined by \cite[Hamilton (1985)]{ham85}, H+K(CaII) and Hdelta /FeI defined by \cite[Rose (1984, 1985)]{ros84}. Blue indices are correlated to the age of the last starburst occurred in a galaxy \cite[(Leonardi & Rose 1996)]{leo96}. The determination of these indices, the estimate of the measurement errors and the correction for the galaxies velocity dispersions are discussed in detail. In the Appendix A we present the indices for a set of hot stars (T> 10000 K) which may be used for extending W92 fitting functions toward high temperatures. Based on observations obtained at ESO, La Silla, Chile. Tables 1-8 are also available in electronic form at CDS and Tables 9-15 are only available in electronic form at CDS: via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html

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