Star Formation in Early-type galaxies (Longhetti+ 1998)

Details Star Formation in Early-type galaxies (Longhetti+ 1998) Star Formation in Early-type galaxies (Longhetti+ 1998)

Mar 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998ycat..41300251l&link_type=abstract

VizieR On-line Data Catalog: J/A+AS/130/251. Originally published in: 1998A&AS..130..251L

Computer Science

Galaxy Catalogs, Spectroscopy

Scientific paper

The paper is the first of a series (Longhetti et al., 1998A&AS..130..267L, 1998b (Paper III) in press) dedicated to the study of the star formation history in early-type galaxies which show fine structures and/or interaction signatures. It presents nuclear line-strength indices for a sample composed of 21 shell galaxies, from the Malin & Carter (1983ApJ...274..534M) southern survey, and 30 members of isolated interacting pairs, from the Reduzzi & Rampazzo (1995ApL....30....1R) catalogue, located in low density environments. The spectral range covers 3700Å<λ<5700Å at 2.1ÅFWHM resolution. We measure 16 red (λ>4200Å) 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 Gonzalez (1993, Ph.D. thesis) sample. We derive also three blue (λ<4200) indices, namely {DELTA}(4000Å) defined by Hamilton (1985ApJ...297..371H), H+K(CaII) and Hdelta/FeI defined by Rose (1984AJ.....89.1238R, 1985AJ.....90.1927R). Blue indices are correlated to the age of the last starburst occurred in a galaxy (Leonardi & Rose, 1996AJ....111..182L). The indices determination, 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>10000K) which may be used for extending, toward high temperatures, Worthey (1992, Ph.D. Thesis) fitting functions. (12 data files).

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