Odessa database of atmospheric Odessa database of atmospheric parameters and chemical parameters and chemical

composition of starscomposition of stars

F. A. ChekhonadskikhF. A. Chekhonadskikh

Odessa Astronomical ObservatoryOdessa Astronomical Observatory

Workshop – SCOPES – Odessa 2011

Mishenina, Kovtyukh, et al.Mishenina, Kovtyukh, et al.

Analysis of neutron capture elements in metal-poor Analysis of neutron capture elements in metal-poor stars.// A&A, 2001-2003.stars.// A&A, 2001-2003.

On the correlation of elemental abundances with On the correlation of elemental abundances with kinematics among galactic disk stars.// A&A, 2004.kinematics among galactic disk stars.// A&A, 2004.

Elemental abundances in the atmosphere of clump Elemental abundances in the atmosphere of clump giants.// A&A, 2006-2007.giants.// A&A, 2006-2007.

Spectroscopic investigation of stars on the lower Spectroscopic investigation of stars on the lower main sequence.// A&A, 2008.main sequence.// A&A, 2008.

Main results:Main results:

100 metal-poor stars, -3 < 100 metal-poor stars, -3 < [Fe/H] [Fe/H] < -0.5, chemical < -0.5, chemical composition: 15 elements.composition: 15 elements.

174 FGK dwarfs, 4683K < Teff. < 6178K, chemical 174 FGK dwarfs, 4683K < Teff. < 6178K, chemical composition: Fe and composition: Fe and αα-elements.-elements.

177 clump giants, 177 clump giants, chemical composition: 10 chemical composition: 10 elements.elements.

131 cool main sequence stars, chemical composition: 131 cool main sequence stars, chemical composition: 15 elements.15 elements.

Andrievsky, Kovtyukh, et al.Andrievsky, Kovtyukh, et al.

Using Cepheids to determine the galactic Using Cepheids to determine the galactic abundance gradient. I-IV.// A&A, 2002-abundance gradient. I-IV.// A&A, 2002-2003.2003.

Phase-dependent variation of the Phase-dependent variation of the fundamental parameters of Cepheids. I-fundamental parameters of Cepheids. I-IV.// PASP, AJ, 2003-2008.IV.// PASP, AJ, 2003-2008.

Main results:Main results:

225 classical Cepheids, chemical composition: 225 classical Cepheids, chemical composition: 25 elements.25 elements.

Galactic abundance gradient of 25 elements Galactic abundance gradient of 25 elements was obtained for the distance range 4-16 kpc.was obtained for the distance range 4-16 kpc.

Phase-dependent variation of the Phase-dependent variation of the fundamental parameters and fundamental parameters and abundancesabundances were researched.were researched.

Spectra:Spectra:

1.93-m telescope, ELODIE – OHP (France)1.93-m telescope, ELODIE – OHP (France) 2.1-m Struve reflector, Sandiford echelle 2.1-m Struve reflector, Sandiford echelle

spectrograph – McDonald Observatory (USA)spectrograph – McDonald Observatory (USA) 1.52-m, 3.5-m, 8-m telescopes, FEROS, EMMI, 1.52-m, 3.5-m, 8-m telescopes, FEROS, EMMI,

UVES – ESO (Chile)UVES – ESO (Chile)

R ~ 35000 – 60000, signal-to-noise better 100R ~ 35000 – 60000, signal-to-noise better 100

Tasks:Tasks:

The original data, itemized in a MySQL The original data, itemized in a MySQL database managed by the SQL language.database managed by the SQL language.

The code package, written in PHP for routine The code package, written in PHP for routine operations to import-export and backup data. operations to import-export and backup data.

The web interface on CMS, written in HTML The web interface on CMS, written in HTML and PHP.and PHP.

Database content:Database content: List of stars: HD, comment.List of stars: HD, comment. List of chemical elements: name of chemical List of chemical elements: name of chemical

element, atomic number, mass number, etc. element, atomic number, mass number, etc. Fundamental parameters of stellar atmospheres: Fundamental parameters of stellar atmospheres:

effective temperature, microturbulent velosity effective temperature, microturbulent velosity and gravity.and gravity.

Tables of abundances:Tables of abundances: 12lglg HN

XNX

XXHX lglg *

Future challenges:Future challenges:

Organization of a cross-access with SIMBADOrganization of a cross-access with SIMBAD Expansion of the database by adding Expansion of the database by adding

additional characteristics of stars: absolute additional characteristics of stars: absolute stellar magnitudes, intrinsic color indexes, stellar magnitudes, intrinsic color indexes, color excess, radial velocities, distances, etc. color excess, radial velocities, distances, etc.

Further testing and refining of the web-Further testing and refining of the web-interface for better usabilityinterface for better usability

Thanks for your Thanks for your attention!attention!