Stability chart of the triangular points in the elliptic restricted problem of three bodies

The possible observations of Trojan-like extrasolar planets stimulate the deeper understanding of the stability behaviour of the co-orbital resonant motion. By using Hill's equations and the energy-rate method an analysis of the stability map of the elliptic restricted three-body problem is performed. Regions of the $\mu-e$ parameter plane are described numerically and related to the resonant frequencies of librational motion. Stability and instability can therefore be obtained by analysing the two independent frequency modes depending on system parameters. The key role of the long period libration in determining the structure of the stability is demonstrated and also a stability mechanism is found that is responsible for extended life time of the test particle in the unstable domain of the stability map.Comment: 7 pages, 8 figures, accepted to MNRA

Synergies between Exoplanet Surveys and Variable Star Research

With the discovery of the first transiting extrasolar planetary system back to 1999, a great number of projects started to hunt for other similar systems. Because of the incidence rate of such systems was unknown and the length of the shallow transit events is only a few percent of the orbital period, the goal was to monitor continuously as many stars as possible for at least a period of a few months. Small aperture, large field of view automated telescope systems have been installed with a parallel development of new data reduction and analysis methods, leading to better than 1% per data point precision for thousands of stars. With the successful launch of the photometric satellites CoRot and Kepler, the precision increased further by one-two orders of magnitude. Millions of stars have been analyzed and searched for transits. In the history of variable star astronomy this is the biggest undertaking so far, resulting in photometric time series inventories immensely valuable for the whole field. In this review we briefly discuss the methods of data analysis that were inspired by the main science driver of these surveys and highlight some of the most interesting variable star results that impact the field of variable star astronomy.Comment: This is a review presented at "Wide-field variability surveys: a 21st-century perspective" - 22nd Los Alamos Stellar Pulsation Conference Series Meeting, held in: San Pedro de Atacama, Chile, Nov. 28-Dec. 2, 2016. To appear in Web of Conferences Journal: 13 pages, 8 figure

Gender Equality in Virtual Work II.: Regulatory Suggestions

This article focuses on gender equality in virtual work, taking special account of the regulatory challenges. It contributes to broader debates on the workers' situation in the sharing economy in two ways. Firstly, it makes an inaugural attempt to evaluate the implications of the new forms of work in the sharing economy for female virtual workers, looking at the issue of equal treatment. Secondly, it offers preliminary suggestions regarding a future regulation to improve equality between genders in virtual work. This is the second part of a paper on gender equality in virtual work. The first part (published in the 2018/1 issue of the Hungarian Labour Law E-Journal) defined "virtual work", classified its two basic forms and emphasised the specific traits of this form of work to demonstrate the need of special protection against discrimination. Subsequently, it identified the possible beneficial and adverse implications of virtual work for female workers and gender equality. This second part firstly provides a summary of the gender equality law of the European Union that serves as a point of reference when speaking about antidiscrimination law. Section 2 offers three normative perspectives and suggestions as to how to enhance gender equality in virtual work. Finally, the paper concludes

Gender Equality in Virtual Work I.: Risks

This article focuses on gender equality in virtual work, taking special account of the regulatory challenges. It contributes to broader debates on the workers' situation in the sharing economy in two ways. Firstly, it makes an inaugural attempt to evaluate the implications of the new forms of work in the sharing economy for female virtual workers, looking at the issue of equal treatment. Secondly, it offers preliminary suggestions regarding a future regulation to improve equality between genders in virtual work. The paper is divided into four main parts. The first section defines "virtual work", classifies its two basic forms and emphasises the specific traits of this form of work to demonstrate the need of special protection against discrimination. Secondly, the paper identifies the possible beneficial and adverse implications of virtual work for female workers and gender equality. Thirdly, the paper provides a summary of the gender equality law of the European Union that serves as a point of reference when speaking about antidiscrimination law. Section 4 offers three normative perspectives and suggestions as to how to enhance gender equality in virtual work. Finally, the paper concludes. This first part of this two-part paper concentrates on the risks of virtual work for equal treatment, while the second part is going to address the regulatory options and suggestions

Are all RR Lyrae stars modulated?

We analyzed 151 variables previously classified as fundamental mode RR Lyrae stars from Campaigns 01-04 of the Kepler two wheel (K2) archive. By employing a method based on the application of systematics filtering with the aid of co-trending light curves in the presence of the large amplitude signal component, we searched for additional Fourier signals in the close neighborhood of the fundamental period. We found only 13 stars without such components, yielding the highest rate of 91% of modulated (Blazhko) stars detected so far. A detection efficiency test suggests that this occurrence rate likely implies a 100% underlying rate. Furthermore, the same test performed on a subset of the Large Magellanic Cloud RR Lyrae stars from the MACHO archive shows that the conjecture of high true occurrence rate fits well to the low observed rate derived from this database.Comment: Submitted to Astronomy & Astrophysics (6 pages, 8 figures