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Astron. Astrophys. Suppl. Ser. 135, 339-346

CHIANTI - an atomic database for emission lines

III. Continuum radiation and extension of the ion database

E. Landi1 - M. Landini1 - K.P. Dere2 - P.R. Young3 - H.E. Mason3

Send offprint request: E. Landi (

1 - Department of Astronomy and Space Science, University of Florence, Italy
2 - Naval Research Laboratory, Washington DC, U.S.A.
3 - Department of Applied Mathematics and Theoretical Physics, University of Cambridge, UK

Received August 10; accepted October 9, 1998


CHIANTI provides a database of atomic energy levels, wavelengths, radiative transition probabilities and electron excitation data for a large number of ions of astrophysical interest. This database allows the calculation of theoretical line emissivities necessary for the analysis of optically thin emission line spectra, and includes also a suite of IDL (Interactive Data Language) programs to calculate optically thin synthetic spectra and to perform spectral analysis and plasma diagnostics.

The first version (1.0) of the CHIANTI database was released in 1996 (Dere et al. 1997) and has been extensively used for analysis of line spectra from astrophysical sources by the scientific community.

The present paper describes the first major update to the CHIANTI database which will subsequently be labeled version 2.0. The update consists of the addition of a large number of new ions, the revision of existing data for some ions and the inclusion of an IDL procedure to calculate the continuum.

The CHIANTI atomic database and supporting IDL routines are freely available through the internet.

Key words: atomic data -- astronomical data bases: miscellaneous -- ultraviolet: general -- Sun: atmosphere -- stars: atmosphere -- atomic database

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