Molecules and late-type stellar models

A difficulty encountered by Osterbrock, when he tried to identify particular red dwarf stars by interpolating between his models of late-type main-sequence stars, is shown to be alleviated by including the effects produced by hydrogen molecules in the convective zone

On the absorption continuum of the negative oxygen ion

A new determination of the electron affinity of oxygen (3.07 e.v.) suggests that the ionization continuum of 0<SUP>-</SUP> in the photographic ultraviolet region becomes so strong in late K and M stars that its contribution to the monochromatic absorption coefficient cannot be neglected. The influence of 0<SUP>-</SUP> on the Rosseland mean is insignificant. A discontinuity in the spectra of M giants, first observed by Lindblad, is tentatively identified with the absorption edge of 0<SUP>-</SUP> near &#955;4050. The theoretical strength of the Lindblad discontinuity depends on the abundance ratio of atomic oxygen to atomic hydrogen, which in M stars varies with the pressure-sensitive shift of the dissociation equilibrium of the several hydrides and oxides. The result is a positive absolute magnitude effect for the Lindblad discontinuity. The differential of free-oxygen abundance implied by Lindblad's spectrophotometric observations agrees as to order of magnitude with that predicted by Russell from the dissociation equilibrium in giant and dwarf stars of the oxygen branch

Hormonal Contraception. Guideline of the DGGG, OEGGG and SGGG (S3 Level, AWMF Registry Number 015/015, January 2020).

Aims This is an official interdisciplinary guideline published and coordinated by the German Society for Gynecology and Obstetrics (DGGG), the Austrian Society for Gynecology and Obstetrics (OEGGG) and the Swiss Society for Gynecology and Obstetrics (SGGG). The guideline was developed for use in German-speaking regions and is backed by numerous professional societies and organizations. The aim of this guideline is to provide an evidence- and consensus-based overview of the diagnostic approach and the management of hormonal contraception based on a systematic evaluation of the relevant literature. Methods To compile this S3-guideline, a systematic search for evidence was carried out in PubMed and the Cochrane Library to adapt existing guidelines and identify relevant reviews and meta-analyses. A structured evaluation of the evidence was subsequently carried out on behalf of the Guidelines Commission of the DGGG, and a structured consensus was achieved based on consensus conferences attended by representative members from the different specialist societies and professions. Recommendations Evidence-based recommendations about the advice given to women requesting contraception were compiled. The guideline particularly focuses on prescribing contraceptives which are appropriate to women's individual needs, take account of her personal circumstances, and have few or no side effects

Search for Scalar Diphoton Resonances in the Mass Range 65−60065-600 GeV with the ATLAS Detector in pppp Collision Data at s\sqrt{s} = 8 TeVTeV

A search for scalar particles decaying via narrow resonances into two photons in the mass range 65–600 GeV is performed using $20.3\text{}\text{}{\mathrm{fb}}^{-1}$ of $\sqrt{s}=8\text{}\text{}\mathrm{TeV}$ $pp$ collision data collected with the ATLAS detector at the Large Hadron Collider. The recently discovered Higgs boson is treated as a background. No significant evidence for an additional signal is observed. The results are presented as limits at the 95% confidence level on the production cross section of a scalar boson times branching ratio into two photons, in a fiducial volume where the reconstruction efficiency is approximately independent of the event topology. The upper limits set extend over a considerably wider mass range than previous searches