Rotational modulation and single g-mode pulsation in the B9pSi star HD 174356?

Chemically peculiar (CP) stars of the upper main sequence are characterized by specific anomalies in the photospheric abundances of some chemical elements. The group of CP2 stars, which encompasses classical Ap and Bp stars, exhibits strictly periodic light, spectral, and spectropolarimetric variations that can be adequately explained by the model of a rigidly rotating star with persistent surface structures and a stable global magnetic field. Using observations from the Kepler K2 mission, we find that the B9pSi star HD 174356 displays a light curve variable in both amplitude and shape, which is not expected in a CP2 star. Employing archival and new photometric and spectroscopic observations, we carry out a detailed abundance analysis of HD 174356 and discuss its photometric and astrophysical properties in detail. We employ phenomenological modelling to decompose the light curve and the observed radial velocity variability. Our abundance analysis confirms that HD 174356 is a silicon-type CP2 star. No magnetic field stronger than 110 G was found. The star's light curve can be interpreted as the sum of two independent strictly periodic signals with and. The periods have remained stable over 17 yr of observations. In all spectra, HD 174356 appears to be single-lined. From the simulation of the variability characteristics and investigation of stars in the close angular vicinity, we put forth the hypothesis that the peculiar light variability of HD 174356 arises in a single star and is caused by rotational modulation due to surface abundance patches (P1) and g-mode pulsation (P2).Fil: Mikulaek, Z. Masaryk University; República ChecaFil: Paunzen, E.. Masaryk University; República ChecaFil: Hümmerich, S.. Masaryk University; República ChecaFil: Niemczura, E.. University of Wrocław; PoloniaFil: Walczak, P.. University of Wrocław; PoloniaFil: Fraga, L.. Masaryk University; República ChecaFil: Bernhard, K.. American Association of Variable Star Observers ; Estados UnidosFil: Janik, J.. Masaryk University; República ChecaFil: Hubrig, S.. Leibniz-Institut für Astrophysik Potsdam; AlemaniaFil: Järvinen, S.. Masaryk University; República ChecaFil: Jagelka, M.. Leibniz Institute For Astrophysics Potsdam; AlemaniaFil: Pintado, Olga Ines. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tucumán. Instituto Superior de Correlación Geológica. Universidad Nacional de Tucumán. Facultad de Ciencias Naturales e Instituto Miguel Lillo. Departamento de Geología. Cátedra Geología Estructural. Instituto Superior de Correlación Geológica; Argentina. Universidad San Pablo Tucumán; ArgentinaFil: Krticka, J.. Masaryk University; República ChecaFil: Prisegen, M.. Masaryk University; República ChecaFil: Skarka, M.. Masaryk University; República ChecaFil: Zejda, M.. Masaryk University; República ChecaFil: Ilyin, I.. Leibniz-Institut für Astrophysik Potsdam; AlemaniaFil: Pribulla, T.. Masaryk University; República ChecaFil: Kaminski, K.. Adam Mickiewicz University; PoloniaFil: Kaminska, M. K.. Adam Mickiewicz University; PoloniaFil: Tokarek, J.. Adam Mickiewicz University; PoloniaFil: Zielinski, P.. Astronomical Observatory University of Warsaw; Poloni

Tau Ori and Tau Lib: Two New Massive Heartbeat Binaries

We report the discovery of two massive eccentric systems with BRITE data, tau Ori and tau Lib, showing heartbeat effects close to the periastron passage. τ Lib exhibits shallow eclipses that will soon vanish due to the apsidal motion in the system. In neither system, tidally excited oscillations were detected

Principal component analysis of summertime ground site measurements in the Athabasca oil sands with a focus on analytically unresolved intermediate-volatility organic compounds

In this paper, measurements of air pollutants made at a ground site near Fort McKay in the Athabasca oil sands region as part of a multi-platform campaign in the summer of 2013 are presented. The observations included measurements of selected volatile organic compounds (VOCs) by a gas chromatograph–ion trap mass spectrometer (GC-ITMS). This instrument observed a large, analytically unresolved hydrocarbon peak (with a retention index between 1100 and 1700) associated with intermediate-volatility organic compounds (IVOCs). However, the activities or processes that contribute to the release of these IVOCs in the oil sands region remain unclear. Principal component analysis (PCA) with varimax rotation was applied to elucidate major source types impacting the sampling site in the summer of 2013. The analysis included 28 variables, including concentrations of total odd nitrogen (NOy), carbon dioxide (CO2), methane (CH4), ammonia (NH3), carbon monoxide (CO), sulfur dioxide (SO2), total reduced-sulfur compounds (TRSs), speciated monoterpenes (including α- and β-pinene and limonene), particle volume calculated from measured size distributions of particles less than 10 and 1&thinsp;µm in diameter (PM10−1 and PM1), particle-surface-bound polycyclic aromatic hydrocarbons (pPAHs), and aerosol mass spectrometer composition measurements, including refractory black carbon (rBC) and organic aerosol components. The PCA was complemented by bivariate polar plots showing the joint wind speed and direction dependence of air pollutant concentrations to illustrate the spatial distribution of sources in the area. Using the 95&thinsp;% cumulative percentage of variance criterion, 10 components were identified and categorized by source type. These included emissions by wet tailing ponds, vegetation, open pit mining operations, upgrader facilities, and surface dust. Three components correlated with IVOCs, with the largest associated with surface mining and likely caused by the unearthing and processing of raw bitumen.</p

Porównanie jakości życia pacjentów po zabiegu planowej koronarografii z dostępu promieniowego i udowego

Background: Radial access during coronary angiography has become an increasingly popular alternative to femoral access. The procedural outcomes and complications of these two approaches have been thoroughly evaluated; however, no studies have focused exclusively on the postprocedural quality of life of patients. Aim: To determine and compare both methods from the patient’s point of view. Methods: Data were gathered from 165 consecutive patients scheduled for elective coronary angiography (from October 2011 to June 2012). The choice of the access site was left at operator’s discretion. Femoral and radial groups consisted of 91 and 74 patients, respectively. Quality of life was assessed by the Short Form of the McGill Questionnaire and a self-designed questionnaire (Questionnaire II) consisting of eight questions evaluating the procedure-specific aspects of recovery time. After three months from index hospitalisation post-discharge interviews were conducted using a modified version of Questionnaire II with an additional two questions. Results: Patients from the transfemoral approach group characterised their pain (according to McGill Questionnaire) more often as aching (mean value ± SD: 0.84 ± 1.2 vs. 0.21 ± 0.6; p = 0.003), heavy (0.29 vs. 0.027; p = 0.02), and exhausting (0.22 ± 0.7 vs. 0.07 ± 0.2; p = 0.037). Moreover, in Questionnaire II they indicated tenderness of the puncture site (0.42 ± 0.8 vs. 0.23 ± 0.07; p = 0.00004) more frequently. Conclusions: The quality of life of patients who underwent coronary angiography from radial access was remarkably better in terms of pain characteristic and overall discomfort.Wstęp: Użycie dostępu promieniowego przy planowych zabiegach koronarograficznych stało się interesującą alternatywą dla klasycznego dostępu przez tętnicę udową. Porównanie obu dostępów pod kątem efektywności i bezpieczeństwa jest szero­ko opisywane w literaturze. Jednak żadne z dotychczasowych badań nie skupiało się wyłącznie na jakości życia pacjentów w czasie rekonwalescencji szpitalnej. Cel: Celem pracy były ocena i porównanie jakości życia po zabiegu planowej koronarografii z dostępu promieniowego i udowego z perspektywy pacjenta. Metody: Do badania włączono 165 kolejnych pacjentów. Grupy dostępu promieniowego i udowego liczyły odpowiednio 74 i 91 osób. Jakość życia oceniono za pomocą skróconej wersji kwestionariusza McGill oraz kwestionariusza dedykowa­nego (Kwestionariusz II) zaprojektowanego na potrzeby tego badania, oceniającego 8 specyficznych aspektów dyskomfortu pozabiegowego. Po 3 miesiącach od hospitalizacji ponownie oceniono jakość życia w czasie rekonwalescencji szpitalnej, używając zmodyfikowanej wersji Kwestionariusza II (IIA), zawierającej 2 dodatkowe pytania dotyczące ogólnej oceny komfortu pozabiegowego z punktu widzenia pacjentów. Wyniki: Chorzy z grupy dostępu udowego częściej określali ból jako: uciążliwy (śr. ± SD: 0,84 ± 1,2 vs. 0,21 ± 0,6 p = 0,003), ciężki (0,29 vs. 0,027; p = 0,02) i wyczerpujący (0,22 ± 0,7 vs. 0,07 ± 0,2; p = 0,037). Ponadto częściej wskazywali na ból w miejscu dostępu jako dokuczliwy (0,42 ± 0,8 vs. 0,23 ± 0,07; p = 0,00004). Wnioski: Wykorzystanie dostępu promieniowego przy planowych zabiegach poprawia jakość życia i zwiększa komfort pacjentów w okresie rekonwalescencji szpitalnej

Emissions of C9 – C16 hydrocarbons from kelp species on Vancouver Island: Alaria marginata (winged kelp) and Nereocystis luetkeana (bull kelp) as an atmospheric source of limonene

In this paper, measurements of C9 – C16 biogenic volatile organic compounds (BVOCs) in the headspaces above near-shore marine vegetation samples of Fucus gardneri (rock weed), Ulva spp. (sea lettuce), Callophyllis spp. (red sea fans), Alaria marginata (winged kelp), and Nereocystis luetkeana (bull kelp) collected on the west coast of Vancouver Island, British Columbia, Canada, are presented. Numerous BVOCs were observed in the headspace samples, including n-alkanes (e.g., n-dodecane, n-tridecane, n-tetradecane and n-pentadecane) and oxygenated hydrocarbons (e.g., octanal, nonanal, geranyl acetone, and 6-methyl-hepten-2-one), though the majority of VOCs emitted was not identified. The emissions from Ulva spp., Callophyllis spp. and F. gardneri samples contained a similar assortment of n-alkanes and oxygenated BVOCs (e.g., n-aldehydes) as observed at Mace Head, Ireland, whereas the headspaces above N. luetkeana and A. marginata contained monoterpenes, foremost limonene, and toluene. Further studies are needed to constrain emissions of BVOCs from near-coastal vegetation as they have the potential to substantially impact coastal O3 budgets and the organic content of marine derived aerosol.Natural Sciences and Engineering Research Council (NSERC

Low levels of nitryl chloride at ground level: nocturnal nitrogen oxides in the Lower Fraser Valley of British Columbia

The nocturnal nitrogen oxides, which include the nitrate radical (NO3), dinitrogen pentoxide (N2O5), and its uptake product on chloride containing aerosol, nitryl chloride (ClNO2), can have profound impacts on the lifetime of NOx ( =  NO + NO2), radical budgets, and next-day photochemical ozone (O3) production, yet their abundances and chemistry are only sparsely constrained by ambient air measurements.Here, we present a measurement data set collected at a routine monitoring site near the Abbotsford International Airport (YXX) located approximately 30 km from the Pacific Ocean in the Lower Fraser Valley (LFV) on the west coast of British Columbia. Measurements were made from 20 July to 4 August 2012 and included mixing ratios of ClNO2, N2O5, NO, NO2, total odd nitrogen (NOy), O3, photolysis frequencies, and size distribution and composition of non-refractory submicron aerosol (PM1).At night, O3 was rapidly and often completely removed by dry deposition and by titration with NO of anthropogenic origin and unsaturated biogenic hydrocarbons in a shallow nocturnal inversion surface layer. The low nocturnal O3 mixing ratios and presence of strong chemical sinks for NO3 limited the extent of nocturnal nitrogen oxide chemistry at ground level. Consequently, mixing ratios of N2O5 and ClNO2 were low ( &lt;  30 and  &lt;  100 parts-per-trillion by volume (pptv) and median nocturnal peak values of 7.8 and 7.9 pptv, respectively). Mixing ratios of ClNO2 frequently peaked 1–2 h after sunrise rationalized by more efficient formation of ClNO2 in the nocturnal residual layer aloft than at the surface and the breakup of the nocturnal boundary layer structure in the morning. When quantifiable, production of ClNO2 from N2O5 was efficient and likely occurred predominantly on unquantified supermicron-sized or refractory sea-salt-derived aerosol. After sunrise, production of Cl radicals from photolysis of ClNO2 was negligible compared to production of OH from the reaction of O(1D) + H2O except for a short period after sunrise

Characteristics of patients presenting with myocardial infarction with non-obstructive coronary arteries (MINOCA) in Poland: data from the ORPKI national registry

Myocardial infarction (MI) with non-obstructive coronary arteries (MINOCA) is an important clinical problem especially in the era of extensive utilization of coronary angiography in MI patients. Its pathophysiology is poorly understood which makes diagnostics and treatment of MINOCA challenging in everyday clinical practice. The aim of the study was to assess characteristics of MINOCA patients in Poland based on data from the Polish National ORPKI Registry. In 2016, 49,893 patients with non-ST-segment elevation (NSTEMI) or ST-segment elevation (STEMI) myocardial infarction entered the ORPKI registry. MINOCA was defined as a non-obstructive coronary artery disease (CAD) and a lack of previous coronary revascularization. MINOCA was identified in 3924 (7.8%) patients and clinical presentation was more often NSTEMI than STEMI (MINOCA: 78 vs. 22%; obstructive CAD 51.1 vs. 48.9%; p\u2009<\u20090.0001). MINOCA patients were younger and more often females with significantly lower rates of diabetes, smoking, arterial hypertension, kidney disease, previous MI and previous stroke comparing to patients with obstructive CAD. Myocardial bridge was visualized in angiography more often in the MINOCA group (2.2 vs. 0.4%; p\u2009<\u20090.0001). Additional coronary assessment inducing fractional flow reserve, intravascular ultrasound, optical coherence tomography was marginally (<\u20091%) used in both groups. Periprocedural mortality was lower in MINOCA group (0.13% vs. 0.95%; p\u2009<\u20090.0001). MINOCA patients represent a significant proportion of MI patients in Poland. Due to multiple potential causes, MINOCA should be considered rather as a working diagnosis after coronary angiography and further efforts should be taken to define the cause of MI in each individual patient

A large contribution of anthropogenic organo-nitrates to secondary organic aerosol in the Alberta oil sands

10.5194/acp-19-12209-2019Atmospheric Chemistry and Physics191912209-1221