Galactic Evolution of Beryllium and Oxygen

We discuss the early evolution of beryllium and oxygen in our Galaxy by comparing abundances of these elements for halo and disk metal-poor stars. Both, O and Be rise as we go progressively to more metal-rich stars, showing a slope 0.41 +-0.09 ([Be/O] vs [Fe/H]) for stars with [Fe/H] < -1. This relationship provides an observational constraint to the actually proposed Galactic Cosmic Ray theories.Comment: 8 pages, 2 figures, To appear in The Light Elements and Their Evolution, IAU Symp. 198, L. da Silva, M. Spite and R. de Medeiros, eds., AS

Constraints to the Masses of Brown Dwarf Candidates from the Lithium Test

We present intermediate dispersion (0.7-2.2 \AA ~pix$^{-1}$) optical spectroscopic observations aimed at applying the ``Lithium Test'' to a sample of ten brown dwarf candidates located in the general field, two in young open clusters, and two in close binaries. We find evidence for strong Li depletion in all of them, and thus infer lower mass limits of 0.065~M$_\odot$, depending only slightly ($\pm$0.005~M$_\odot$) on the interior models. None of the field brown dwarf candidates in our sample appears to be a very young (age $<$~10$^8$~yr) substellar object. For one of the faintest proper motion Pleiades members known (V=20.7) the Li test implies a mass greater than $\sim$0.08~M$_\odot$, and therefore it is not a brown dwarf. From our spectra we estimate spectral types for some objects and present measurements of Halpha emission strengths and radial velocities. Finally, we compare the positions in the H-R diagram of our sample of brown dwarf candidates with the theoretical region where Li is expected to be preserved (Substellar Lithium Region). We find that certain combinations of temperature calibrations and evolutionary tracks are consistent with the constraints imposed by the observed Li depletion in brown dwarf candidates, while others are not.Comment: 20 pp.; 4 figs, available under request; plain LaTeX, ApJ in press, OACatania-94-00

A search for lithium in metal-poor L dwarfs

The aim of the project is to search for lithium in absorption at 6707.8 Angstroms to constrain the nature and the mass of the brightest low-metallicity L-type dwarfs (refered to as L subdwarfs) identified in large-scale surveys. We obtained low- to intermediate-resolution (R~2500-9000) optical (~560-770 nm) spectra of two mid-L subdwarfs, SDSSJ125637.13-022452.4 (SDSS1256; sdL3.5) and 2MASSJ162620.14+392519.5 (2MASS1626; sdL4) with spectrographs on the European Southern Observatory Very Large Telescope and the Gran Telescopio de Canarias. We report the presence of a feature at the nominal position of the lithium absorption doublet at 6707.8 Angstroms in the spectrum of SDSS1256, with an equivalent width of 66+/-27 Angstroms at 2.4 sigma, which we identify as arising from a CaH molecular transition based on atmosphere models. We do not see any feature at the position of the lithium feature in the spectrum of 2MASS1626. The existence of overlapping molecular absorption sets a confusion detection limit of [Li/H]=-3 for equivalently-typed L subdwarfs. We provided improved radial velocity measurements of -126+/-10 km/s and -239+/-12 km/s for SDSS1256 and 2MASS1626, respectively, as well as revised Galactic orbits. We implemented adjusting factors for the CaH molecule in combination with the NextGen atmosphere models to fit the optical spectrum of SDSS1256 in the 6200-7300 Angstroms range. We also estimate the expected Li abundance from interstellar accretion ([Li/H]=-5), place limits on circumstellar accretion (10^9 g/yr), and discuss the prospects of Li searches in cooler L and T subdwarfs.Comment: 9 pages, 6 figures, 4 tables, accepted to A&

Experiencias de las mujeres en el aborto espontáneo: Revisión narrativa

Trabajo fin de grado en EnfermeríaObjetivos: Conocer las experiencias de las mujeres que sufren un aborto espontáneo y su relación con los profesionales sanitarios. Metodología: Revisión narrativa mediante una búsqueda bibliográfica en las bases de datos Pubmed, Cuiden, Crochane, Cinahl, PsycInfo de estudios publicados entre 2007 y 2017. Se establecieron criterios de inclusión, exclusión y limitadores. Resultados: Se analizaron 14 artículos y se obtuvieron cuatro temas: 1) Experiencias al inicio de los primeros síntomas, 2) experiencias durante el proceso del aborto, 3) experiencias tras el aborto y 4) el papel de los profesionales sanitarios en el aborto. El primer tema expone como las mujeres viven los signos que indican el inicio del aborto, el segundo tema explica cómo se sienten las mujeres durante el tratamiento del aborto, el tercer tema manifiesta los sentimientos de las mujeres que surgen tras el aborto y cómo se enfrentan a ellos y el cuarto tema trata de la relación establecida con las mujeres durante el aborto y los cuidados que proporcionan los profesionales sanitarios. Conclusión: El aborto espontáneo es un problema de salud que afecta a numerosas mujeres a lo largo de su vida reproductiva. La sintomatología física y las emociones experimentadas son particulares de cada mujer. Los profesionales sanitarios deben proporcionar cuidados de forma holística, ya que la calidad de estos influirá en el proceso de recuperación de las mujeres.Aim: To explore women´s experiences of miscarriage and their relationships with health professionals. Methodology: A narrative review was conducted using the databases Pubmed, Cuiden, Crochrane, Cinahl and PsycInfo searching studies published between 2007 and 2017. Inclusive, exclusive criteria and limiters were established. Results: A total of 14 articles were analyzed and we obtained four main themes: 1) the experiences at the beginning of the first symptoms, 2) experiences during the abortion process, 3) after abortion experiences and 4) the health professionals´s role in miscarriage. The first theme symptoms presents how women deal with the signs that confirm the beginning of the miscarriage, the second theme deals with women´s feelings during the miscarriage management, the third theme presents how women confront and deal with the feelings that appear after miscarriage and the fourth theme address the relationship established with the women during miscarriage and the care the health professionals give. Conclusion: Miscarriage is a health problem that affects many women during their reproductive period of life. The physical symptoms and the emotions experienced are individual of each woman. Health professionals should give holistic care, as the cuality of it will influence the women´s healing process

A new flare star member candidate in the Pleiades cluster

We present a new flare star, which was discovered during our survey on a selected field at the edge of the Pleiades cluster. The field was observed in the period 2007 - 2010 with three different CCD-cameras at the University Observatory Jena with telescopes from 25 to 90 cm. The flare duration is almost one hour with an amplitude in the R-band of about 1.08 mag. The location of the flare star in a color-magnitude diagram is consistent with age and distance of the Pleiades. In the optical PSF of the flare star there are two 2MASS objects (unresolved in most images in the optical Jena PSF), so it is not yet known which one of them is responsible for this flare. The BVRIJHK colors yield spectral types of M1 and M2 with extinction being A_V=0.231+/-0.024 mag and A_V=0.266+/-0.020 for those two stars, consistent with the Pleiades cluster.Comment: 8 pages, 7 figure

Vias de aceleração e de desaceleração associadas a intersecções ou a ramos de nós de ligação: metodologia de utilização e de cálculo em países europeus

Esta dissertação tem como objectivo o estudo de um dos grandes problemas da manutenção do Nível de Serviço das vias de comunicação rodoviária e, em especial, da Segurança Rodoviária, que se coloca ao nível das suas acessibilidades, e nas diversas metodologias utilizadas nas vias de aceleração e de desaceleração, ao nível europeu. Neste trabalho, foi coligida a documentação existente em Portugal sobre a introdução e cálculo específico das vias de aceleração e de desaceleração. Seguidamente foi efectuada uma análise deste tema a nível europeu, com base em três países de referência (Espanha, Itália e França), comparando as metodologias respectivas. Por fim, concluída a análise e comparação, são propostas medidas com a finalidade de implementar um conjunto de critérios semelhantes, entre as medidas adoptadas na UE e Portugal