Fine structure of the age-chromospheric activity relation in solar-type stars I: The Ca II infrared triplet: Absolute flux calibration

Strong spectral lines are useful indicators of stellar chromospheric activity. They are physically linked to the convection efficiency, differential rotation, and angular momentum evolution and are a potential indicator of age. However, for ages > 2 Gyr, the age-activity relationship remains poorly constrained thus hampering its full application. The Ca II infrared triplet (IRT lines) has been poorly studied compared to classical chromospheric indicators. We report in this paper absolute chromospheric fluxes in the three Ca II IRT lines, based on a new calibration tied to up-to-date model atmospheres. We obtain the Ca II IRT absolute fluxes for 113 FGK stars from high signal-to-noise ratio and high-resolution spectra covering an extensive domain of chromospheric activity levels. We perform an absolute continuum flux calibration for the Ca II IRT lines anchored in atmospheric models calculated as an explicit function of effective temperatures, metallicity, and gravities avoiding the degeneracy present in photometric continuum calibrations based solely on color indices. The internal uncertainties achieved for continuum absolute flux calculations are 2\% of the solar chromospheric flux, one order of magnitude lower than photometric calibrations. We gauge the impact of observational errors on the final chromospheric fluxes due to the absolute continuum flux calibration and find that $T_{\rm eff}$ uncertainties are properly mitigated by the photospheric correction leaving [Fe/H] as the dominating factor in the chromospheric flux uncertainty. Across the FGK spectral types, the Ca II IRT lines are sensitive to chromospheric activity. The reduced internal uncertainties reported here enable us to build a new chromospheric absolute flux scale and explore the age-activity relation from the active regime down to very low activity levels and a wide range of $T_{\rm eff}$, mass, [Fe/H], and age.Comment: 12 pages, 12 figures, 6 tables, Accepted for publication on A&A. Abstract edited to comply with arXiv standards regarding the number of character

Por D. Lorenzo Fernandez de Villauicencio ... con D. Geronimo Diego de Auila y con D. Manuel Bartolome de Avila y Siguença ... de Xerez sobre la succession del mayorazgo que fundò Doña Juana Melgarejo ...

En texto consta la fecha de 1595 en r. de la h. 2 como fecha de institución del mayorazgoSign.: []1, B-G2Port. con grab. xil. representando a la Virge

Audiovisual management of the Antarctic Heritage

We live in a visual age. Audiovisual narratives are part of our everyday life and tell us something about the world. Such narratives shape our understanding. This paper explores the audiovisual narratives of the UK Antarctic Heritage Trust, the NZ Antarctic Heritage Trust, and Mawson´s Huts Foundation. In doing so, we examined their websites and posts on YouTube, Instagram, Facebook, and Twitter. The results highlight their main topics of interest and focus on their views about the environmental changes in Antarctica, the challenges for the management of Antarctic Heritage, and the future of the Antarctic Treaty System. This presentation aims to evoke reflections and discussions about the role of audiovisual narratives in the management of the Antarctic heritage.Fil: Lorenzo, Cristian A.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Austral de Investigaciones Científicas; Argentina. Universidad Nacional de Tierra del Fuego, Antártida e Islas del Atlántico Sur. Instituto de Ciencias Polares, Ambientales y Recursos Naturales; ArgentinaFil: Fachel de Medeiro, Rosangela. Universidade Federal de Pelotas; BrasilFil: Navarro Drazich, Diego. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad Nacional de San Juan; ArgentinaSCAR 2020 Antarctic Science - Global ConnectionsHobartAustraliaScientific Committee on Antarctic Researc

Psychological States and Training Habits during the COVID-19 Pandemic Lockdown in Spanish Basketball Athletes.

post-print408 K

Novena a Maria SS. Señora Nuestra, que baxo del Soberano Mysterio de su Assumpcion gloriosa à los Cielos, y de la denominación Bascongada de Uribarri, venera la cordial devocion de la Nobilissima Villa de Tavira de Durango (districto del Inclito Señorio de Vizcaya) en su famosa Iglesia Parroquial Matriz

Sign.: A-E8Fecha tomada del colofónDigitalización. Vitoria-Gasteiz : Archivos y Bibliotecas, Mayo 1995Rústic

Forma de reducir daños causados por errores en las aplicaciones de herbicidas de postemergencia en los agrios

A veces se producen aplicaciones directas a la parte aérea de los cítricos, por defectos en los tratamientos. En el presente trabajo se pretenden extraer consecuencias del grado de fitotoxicidad alcanzado, en una aplicación deliberadamente mal efectuada, y las posibilidades de obviar los daños mediante pulverización de agua, a diversos tiempos. Los productos implicados son unas formulaciones comerciales de glifosato, glifosato +MCPA, glufosinato, fluroxipir, oxifluorfen y paraquat + diquat. Los herbicidas de contacto han producido daños muy evidentes en la primera evaluación (3 días después del tratamiento:3ddt) pero en el caso del Gramoxone plus, se reducen en la última evaluación (240 ddt). Los productos Fusta, MCPA y Roundup responden a la aplicación con agua, si se hace próxima al tratamiento. El Goal es el que menores daños produj

La toxicidad aguda del molinato en "Aphanius iberus"

Aphanius iberus (“fartet”) es un pez de agua dulce, autóctono de zonas húmedas, como la Albufera de Valencia, considerado sensible a la contaminación. Se desconoce el grado de toxicidad de Aphanius a los plaguicidas empleados en el cultivo del arroz. El trabajo describe el procedimiento CLs,-96 h para el molinato. Se realizaron tres experimentos principales. El rango de valores está entre 12,82 y 16,43 mg/l. Estos resultados, se comparan favorablemente con el de Salmo gairdneri, que se encuentra entre 0,16-0,29 mg/l

The role of alexithymia in predicting incident depression in patients at first acute coronary syndrome

Objective Alexithymia has been considered both to predispose to depression and to worsen cardiac prognosis after an acute coronary syndrome. Nonetheless, no studies have evaluated its role as a risk factor for incident depression, in patients with acute coronary syndrome. Methods In 251 consecutive patients, the presence of a first-ever depressive episode was evaluated with the Primary Care Evaluation of Mental Disorders at baseline and 1, 2, 4, 6, 9, 12 and 24 months after their first acute coronary syndrome. At baseline, patients completed the Toronto Alexithymia Scale (TAS-20) and the Hospital Anxiety and Depression Scale. Results Out of 251 subjects (80.9% males), a first-ever depressive episode was diagnosed in 66 patients. Depressed and never-depressed patients differed in female gender, living status, alexithymic scores at TAS-20 and depressive symptoms. Nonetheless, nor the TAS-20 factors nor its total score were predictive of developing a depressive episode in a Cox regression. Moreover, baseline differences in TAS-20 scores between the two groups, disappeared after controlling for anhedonic symptoms. Conclusion Our results do not support the hypothesis that alexithymia at TAS-20 is a risk factor for incident depression after acute coronary syndrome