Konkoly Observatory

Dec 4, 2024 | phys.org | Konkoly Observatory

In a study published in Nature Communications, researchers from the Leibniz-Institut for Astrophysics Potsdam (AIP) and the HUN-REN Research Centre for Astronomy and Earth Sciences (HUN-REN CSFK) have reconstructed the temporal changes in the distribution of surface spots on the red giant star XX Trianguli. The research is based on a unique series of spectroscopic observations carried out by the STELLA robotic observatory over 16 years.

Nov 8, 2024 | academic.oup.com | Université de Toulouse |Departamento de Física |Av. Antônio Carlos |Konkoly Observatory

This paper presents near-infrared spectropolarimetric and velocimetric observations of the young planet-hosting T Tauri star PDS 70, collected with SPIRou at the 3.6-m Canada-France-Hawaii Telescope from 2020 to 2024. Clear Zeeman signatures from magnetic fields at the surface of PDS 70 are detected in our data set of 40 circularly polarized spectra.

Jun 8, 2024 | academic.oup.com | Konkoly Observatory |ELTE Eötvös Loránd |Instituto de Astrofísica |Universidad Andres Bello

Long gamma-ray bursts (LGRBs) with1T ≳ 2 s (Kouveliotou et al. 1993) are thought to emerge from the death of rapidly rotating, metal-poor, and massive stars (e.g. Wolf–Rayet; Woosley 1993; Woosley, Heger & Weaver 2002; Piran 2004; Zhang, Woosley & Heger 2004; Maeder & Meynet 2012; Zhang 2019).

Feb 6, 2024 | academic.oup.com | Place Eugène Bataillon |Konkoly Observatory |ELTE Eötvös Loránd

Understanding the accretion of pre-main-sequence (PMS) stars is a major aim of stellar and planetary formation and evolution studies, because, together with the ejection processes, it governs the transport of angular momentum which ensures the star’s stability, and shapes the disc, birthplace of exoplanets.

Nov 6, 2023 | academic.oup.com | Konkoly Observatory |ELTE Eötvös Loránd

There are currently 4124 spectroscopically identified active galactic nuclei (AGNs) at redshifts z ≥ 4 collected in our continuously updated catalogue of high-redshift AGNs.1 (P17 hereafter, Perger et al. 2017). Around 8 per cent of them were detected in either of the large sky surveys in radio bands, the Faint Images of the Radio Sky at Twenty-centimeters (FIRST; White et al. 1997; Helfand, White & Becker 2015) survey, the NRAO VLA Sky Survey (NVSS; Condon et al.