Determinations of high-precision effective temperatures for giants based on spectroscopic criteria - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Astronomy reports (Astronomicheskii Zhurnal) Année : 2006

Determinations of high-precision effective temperatures for giants based on spectroscopic criteria

Résumé

Spectral lines with high and low excitation potentials respond differently to changes of the effective temperature (T eff), making the ratio of their depths (or equivalent widths) a very sensitive temperature indicator. We derive a set of 100 equations relating T eff to the line-depth ratios, calibrated against accurate (to within 1%) published temperature determinations for giants. These relations are used to determine very accurate temperatures for a sample of 110 giants with nearly solar metallicities based on high-resolution (R = 42 000) échelle spectra with high signal-to-noise ratios (SNRs). The calibration relations are valid for temperatures of 4000–7000 K (F2III–K4III). The internal errors of each of the calibration relations are below 95 K, and applying all these relations together to spectra with SNR = 100 reduces the errors to 5–25 K (1 ?). A major advantage of this technique is that it is independent from interstellar reddening, spectroscopic resolution, and line broadening due to rotation and microturbulence.

Dates et versions

hal-00023197 , version 1 (21-04-2006)

Identifiants

Citer

V. V. Kovtyukh, T. V. Mishenina, T. I. Gorbaneva, O. Bienaymé, C. Soubiran, et al.. Determinations of high-precision effective temperatures for giants based on spectroscopic criteria. Astronomy reports (Astronomicheskii Zhurnal), 2006, 50-2, pp.134-142. ⟨10.1134/S1063772906020065⟩. ⟨hal-00023197⟩
50 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More