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Astron. Astrophys. 325, 1025-1030 (1997)

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Indicators of star formation: 4000 Å break and Balmer lines

B.M. Poggianti 1, 2 and G. Barbaro 3

1 Institute of Astronomy and Royal Greenwich Observatory, Madingley Road, Cambridge, UK, bianca@ast.cam.ac.uk
2 Kapteyn Instituut, PO Box 800, 9700 AV Groningen, The Netherlands
3 Dipartimento di Astronomia, vicolo dell'Osservatorio 5, I-35122 Padova, Italy, barbaro@astrpd.pd.astro.it

Received 9 November 1995 / Accepted 18 March 1997


The behaviour of the 4000 Å break index and of the equivalent width of the main Balmer lines is investigated a) for a single star as a function of effective temperature, gravity and metallicity and b) for a single stellar population as a function of age and metallicity. Consequences for the interpretation of integrated spectra are presented.

Key words: galaxies: stellar content – stars: general – galaxies: star clusters – galaxies: evolution

Send offprint requests to: B.M. Poggianti (RGO)


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© European Southern Observatory (ESO) 1997

Online publication: April 28, 1998