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Type of publication: research article
Type of publication (PDB): Straipsnis Clarivate Analytics Web of Science / Article in Clarivate Analytics Web of Science (S1)
Field of Science: Astronomija / Astronomy (N008)
Author(s): Straižys, Vytautas;Lazauskaitė, Romualda;Zdanavičius, K
Title: Star classification possibilities with the GAIA spectrophotometers. II. A method for empirical decontamination of the BP/RP spectra
Is part of: Baltic astronomy. , Vol. 19, iss. 3-4 (2010)
Extent: p. 181-195
Date: 2010
Keywords: Fundamental parameters (classification, colors, spectral types, luminosities);ISM: extinction, space vehicles: GAIA
Abstract: The contamination in the GAIA BP and RP spectra, caused by the LSF smearing, is a serious obstacle for the classification of stars since the contamination values at different wavelengths depend on temperatures, gravities, metallicities and interstellar reddenings of stars, and these parameters are unknown before the classification. This makes impossible to apply traditional methods for photometric classification of stars based on color indices or interstellar reddening-free Q-parameters. For determining contamination for the stars of `normal' spectral sequence we propose the method of `color equations', well known in stellar photometry. The equations connecting the decontamination correction at a chosen wavelength with the observed `color indices' are derived. These equations make possible to determine decontamination corrections for unreddened stars with an accuracy of 0.01--0.02 mag in the wavelength range of 400--1000 nm. The equations are different for M-type stars which can be separated from stars of earlier spectral classes using the contaminated RP spectra and treated separately. The equations are valid not only for unreddened stars but also for stars affected by interstellar extinction up to AV = 3 mag. At shorter wavelengths (350--400 nm) the contamination is much larger and can be determined with lower accuracy
Affiliation(s): Vilniaus universiteto Teorinės fizikos ir astronomijos institutas
Vytauto Didžiojo universitetas
Švietimo akademija
Appears in Collections:Universiteto mokslo publikacijos / University Research Publications

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