Shockwave Behaviour in RR Lyrae Stars

Here we present the detailed analysis of some modulated Kepler and K2 RR Lyrae stars that show peculiar bump progression in respect to the pulsation phase.Comment: 3 pages, 3 figures, to be published in the proceedings of "The RR Lyrae 2017 Conference", Niepolomice, Poland, 17-21 September 201

Automated Extended Aperture Photometry for K2 RR Lyrae stars

Light curves for RR Lyrae stars can be difficult to obtain properly in the K2 mission due to the similarities between the timescales of the observed physical phenomena and the instrumental signals appearing in the data. We developed a new photometric method called Extended Aperture Photometry (EAP), a key element of which is to extend the aperture to an optimal size to compensate for the motion of the telescope and to collect all available flux from the star before applying further corrections. We determined the extended apertures for individual stars by hand so far. Now we managed to automate the pipeline that we intend to use for the nearly four thousand RR Lyrae targets observed in the K2 mission. We present the outline of our pipeline and make some comparisons to other photometric solutions.Comment: To appear in Astronomical Society of the Pacific Conference Series, Volume 529, "RRLyrae/Cepheid2019: Frontiers of Classical Pulsators: Theory and Observations", Cloudcroft, NM, USA October 13-18, 201

A baromfitakarmányozás és a húsminőség egyes összefüggései

Napjainkban egyre nagyobb nyomás nehezedik a tenyésztőkre, a takarmányozási szakértőkre és az állattartókra, mivel folyamatosan fenn kell tartani, illetve javítani kell a baromfi fajok hízékonyságát, a takarmány-értékesítést, a mellizom méretét és arányát, és csökkenteni kell az abdominális zsír mennyiségét. Ráadásul mindezt úgy kell kivitelezni, hogy a húsminőségbeli problémákat minimalizálják, ehhez tisztában kell lenni a hibákat kiváltó okokkal. Állandóan szükséges monitorozni a baromfihús érzékszervi és fizikai tulajdonságait. A baromfihús fogyasztói minőségét elsődlegesen a fizikai paraméterek (pl.: szín, íz, állag, szag), másodsorban a hús kémiai összetétele (pl.: fehérje-, vitamin-, zsír-, és ásványi-anyag tartalma) határozzák meg. Magát a húsminőséget egy bizonyos szintig befolyásolni lehet: többek között az állat kora, típusa, ivara, genotípusa, a tartás- és takarmányozás technológia, a vágás, végül a hús kezelése, feldolgozása is befolyással van a húsminőségre. Takarmányozással hatást gyakorolhatunk a húsminőségre mind negatív (pl.: halíz előidézése), mind pozitív irányba. Módosítani lehet a vágott baromfi fehérje-zsír arányát, magát a zsírosodást, a zsírsav összetételt (telített:telítetlen; ω-3 zsírsavak aránya, stb.), az ásványianyag- és vitamintartalmát, de a jól megválasztott takarmánnyal akár a brojlercsirkék bőrszínét és ízét is befolyásolni lehet. Érdemes tisztában lenni azzal, hogy mivel milyen, illetve mekkora hatást érhetünk el, mert célunk a fogyasztói igények teljes körű kielégítése

Testing Ultra-low Amplitude Cepheid Candidates in the Galactic Disk by TESS and Gaia

Ultra-low amplitude (ULA) and strange mode Cepheids are thought to be pulsating variable stars that are near to or are at the edges of the classical instability strip. Until now, a few dozen such variable star candidates have been found both in the Large Magellanic Cloud and the Milky Way. In this present work, we studied six ULA Cepheid candidates in the Milky Way, identified by Szab\'o et al. (2009) using CoRoT and 2MASS data. In order to identify their positions in the period--luminosity and color--magnitude diagrams, we used the Gaia DR3 parallax and brightness data of each star to calculate their reddening-free absolute magnitudes and distances. Furthermore, we calculated the Fourier parameters (e.g., period and amplitude) of the light variations based on CoRoT and TESS measurements, and established the long-term phase shifts for four out of six stars. Based on the results, we conclude that none of the six ULA Cepheid candidates are pulsating variable stars, but rather rotation-induced variable stars (rotational spotted and $\alpha^2$~Canum Venaticorum variables) that are either bluer or fainter than Cepheids would be.Comment: 14 pages, 6 tables, 10 figures. Accepted to Astronomy and Astrophysic

Food safety knowledge and awareness of primary school children

The National Food Chain Safety Office (NFCSO) is working to ensure the highest possible level of food safety from farm to table. As an integral part of this, particular attention is paid to minimizing risks that result from the potential lack of knowledge or from the misconceptions of consumers by its awareness raising programs, and emphasis is put on this even in the case of young children who are most receptive to these ideas. In our paper, the results of the survey intended to form the basis of this activity and investigating the knowledge level and awareness of the children are presented. Our research experience indicates that the sometimes incomplete food safety knowledge of children and, in addition, the fact that risks are perceived to be less than actual levels in certain cases justify the coordinated work of teachers and authority experts to instill the necessary knowledge in children already in primary schools

Automated Extended Aperture Photometry of K2 Variable Stars

Proper photometric data are challenging to obtain in the K2 mission of the Kepler space telescope due to strong systematics caused by the two-wheel-mode operation. It is especially true for variable stars wherein physical phenomena occur on timescales similar to the instrumental signals. We originally developed a method with the aim to extend the photometric aperture to be able to compensate the motion of the telescope which we named Extended Aperture Photometry (EAP). Here we present the outline of the automatized version of the EAP method, an open-source pipeline called autoEAP. We compare the light curve products to other photometric solutions for examples chosen from high-amplitude variable stars. Besides the photometry, we developed a new detrending method, which is based on phase dispersion minimization and is able to eliminate long-term instrumental signals for periodic variable stars.Comment: 15 pages, 12 figures. Accepted for publication in PASP. Code available on GitHub: https://github.com/konkolyseismolab/autoeap. Light curve data available: https://konkoly.hu/KIK/data_en.htm