POLLUX: a database of synthetic stellar spectra

摘要

Aims. Synthetic spectra are needed to determine fundamentalstellar and wind parameters of all types of stars. They are also usedfor the construction of theoretical spectral libraries helpful forstellar population synthesis. Therefore, a database of theoreticalspectra is required to allow rapid and quantitative comparisons tospectroscopic data. We provide such a database offering anunprecedented coverage of the entire Hertzsprung-Russell diagram. Methods. We present the POLLUX database of synthetic stellar spectra. For objects with K,MARCS atmosphere models are computed and the program TURBOSPECTRUMprovides the synthetic spectra. ATLAS12 models are computed for starswith 7000K 15000K. SYNSPEC gives the corresponding spectra. Finally,the code CMFGEN provides atmosphere models for the hottest stars ( 25~000$ -->K). Their spectra are computed with CMF_FLUX. Both high resolution 150~000)$ -->(R>150000) optical spectrain the range 3000 to 12000? and spectral energydistributions extending from the UV to near-IR ranges are presented.These spectra cover the HR diagram at solar metallicity. Results. We propose a wide variety of synthetic spectra forvarious types of stars in a format that is compliant with the VirtualObservatory standards. A user-friendly web interface allows an easyselection of spectra and data retrieval. Upcoming developments willinclude an extension to a large range of metallicities and to thenear-IR high resolution spectra, as well as a better coverage of the HRdiagram, with the inclusion of models for Wolf-Rayet stars and largedatasets for cool stars. The POLLUX database is accessible at http://pollux.graal.univ-montp2.fr/ and through the Virtual Observatory. Key words: astronomical databases: miscellaneous - stars: general - techniques: spectroscopic