Library of high-resolution UES echelle spectra of F, G, K and M field dwarf stars

We present a library of Utrecht echelle spectrograph (UES) observations of a sample of F, G, K and M field dwarf stars covering the spectral range from 4800 AA to 10600 AA with a resolution of 55000. These spectra include some of the spectral lines most widely used as optical and near-infrared indicators of chromospheric activity such as H_beta, Mg I b triplet, Na I D_1, D_2, He I D_3, H_alpha, and Ca II IRT lines, as well as a large number of photospheric lines which can also be affected by chromospheric activity. The spectra have been compiled with the aim of providing a set of standards observed at high-resolution to be used in the application of the spectral subtraction technique to obtain the active-chromosphere contribution to these lines in chromospherically active single and binary stars. This library can also be used for spectral classification purposes. A digital version with all the spectra is available via ftp and the World Wide Web (WWW) in both ASCII and FITS formats.Comment: Latex file with 5 figures using l-aa.sty and psfig.sty. Full postscript (text and figures) available at http://www.ucm.es/OTROS/Astrof/fgkmsl/UESfgkmsl.html Accepted for publication in: Astronomy and Astrophysics Supplement

Multiwavelength optical observations of chromospherically active binary systems V. FF UMa (2RE J0933+624): a system with orbital period variation

This is the fifth paper in a series aimed at studying the chromospheres of active binary systems using several optical spectroscopic indicators to obtain or improve orbital solution and fundamental stellar parameters. We present here the study of FF UMa (2RE J0933+624), a recently discovered, X-ray/EUV selected, active binary with strong H_alpha emission. The objectives of this work are, to find orbital solutions and define stellar parameters from precise radial velocities and carry out an extensive study of the optical indicators of chromospheric activity. We obtained high resolution echelle spectroscopic observations during five observing runs from 1998 to 2004. We found radial velocities by cross correlation with radial velocity standard stars to achieve the best orbital solution. We also measured rotational velocity by cross-correlation techniques and have studied the kinematic by galactic space- velocity components (U, V, W) and Eggen criteria. Finally, we have determined the chromospheric contribution in optical spectroscopic indicators, from Ca II H & K to Ca II IRT lines, using the spectral subtraction technique. We have found that this system presents an orbital period variation, higher than previously detected in other RS CVn systems. We determined an improved orbital solution, finding a circular orbit with a period of 3.274 days. We derived the stellar parameters, confirming the subgiant nature of the primary component and obtained rotational velocities (vsini), of 33.57 km/s and 32.38 km/s for the primary and secondary components respectively. From our kinematic study, we can deduce its membership to the Castor moving group. Finally, the activity study has given us a better understanding of the possible mechanisms that produce the orbital period variation.Comment: Latex file with 16 pages, 18 figures. Available at http://www.ucm.es/info/Astrof/invest/actividad/actividad_pub.html Accepted for publication in: Astronomy & Astrophysics (A&A

Corporate e-communication: its relationship with the corporate logo in the construction of digital interaction platforms

Purpose – The purpose of this article is to examine the influence of the corporate logo on the consumer’s attitude within corporate e-communication. Design/methodology/approach – This research designed a model and a number of hypotheses, based on previous studies on corporate logo, its antecedents on e-communication, corporate image and corporate reputation. Online survey was conducted consumers and followers of the shopping social networking platforms (Facebook and Twitter) in from Colombia. Findings – Taking into account previous corporate constructs theories, the author proposes a new conceptual framework to explain how corporate e-communication interacts within an organisation’s structure, and also to show that the consumer’s interaction in corporate e-communication platforms is based on the corporate logo perception held by consumers; as a consequence, the corporate reputation is affected. Originality/value – This study contributes on the understanding and expansion of the organisation’s structure by introducing a new corporate construct, named ‘corporate e-communication’, defined as the digital interaction than an organisation has with its stakeholders, it involves everything it says, shows and does. However, there are a few other areas of concern with regard to consequences related to corporate image and corporate reputation, particularly in Colombian retail setting

Lippia

https://thekeep.eiu.edu/herbarium_specimens_byname/18920/thumbnail.jp

A multi-criteria approach to building resilient neighborhoods through green space investments in Sacramento

The consequences of climate change and urbanization have increased heat, air pollution, and flood risks in urban areas. Green spaces—parks, trees, trails, and gardens—are multifunctional solutions that help communities adapt to these various climate vulnerabilities, promoting urban resiliency through the socio-ecological service they provide. Yet, low-income communities and neighborhoods of color are often deprived of these services. As a result, this study utilizes a multi-criteria analysis to assess a variety of social, climate, and green space indicators in North and South Sacramento, two racially diverse and historically marginalized communities, to recommend more robust green space implementation strategies. Priority areas are identified along the northeastern and eastern edge of North Sacramento and within the central area and eastern boundary of South Sacramento, concluding that both communities could benefit from the additional park and tree investments to meet the area\u27s unique climate needs. Recommendations to maximize green space benefits include: 1) considering multifunctionality in all green space implementation projects 2) further assessing priority areas to identify appropriate locations for future green spaces 3) effectively and equitably engaging with community stakeholders 4) utilizing GIS to better integrate both social equity and climate data 5) consider environmental justice concerns and basic needs of the communities 6) designing green spaces to meet the unique climate and social needs of the areas. These recommendations will serve as a model to direct City of Sacramento decision-makers and planners to consider social and ecological variables in future green space projects in North and South Sacramento