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7 results on '"Stateva, Ivanka"'

1. $\tau$ Ori and $\tau$ Lib: Two new massive heartbeat binaries

Author

Pigulski, Andrzej, Kaminska, Monika K., Kaminski, Krzysztof, Paunzen, Ernst, Budaj, Jan, Pribulla, Theodor, Torres, Pascal J., Stateva, Ivanka, Niemczura, Ewa, Skarka, Marek, Alicavus, Filiz Kahraman, Sekeras, Matej, van der Swaelmen, Mathieu, Vanko, Martin, Vanzi, Leonardo, Borisova, Ana, Helminiak, Krzysztof, Alicavus, Fahri, Dimitrov, Wojciech, Tokarek, Jakub, Derekas, Aliz, Fernandez, Daniela, Garai, Zoltan, Napetova, Mirela, Komzik, Richard, Merle, Thibault, Ratajczak, Milena, Richardson, Noel D., Team, Ritter Observing, Kambe, Eiji, and Ukita, Nobuharu

Subjects
Astrophysics - Solar and Stellar Astrophysics
Abstract

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. $\tau$ Lib exhibits shallow eclipses that will soon vanish due to the apsidal motion in the system. In neither system, tidally excited oscillations were detected., Comment: 3 pages, 1 figure, to appear in the Proceedings of the 3rd BRITE Science Conference

Published
2018

2. Looking for flares and CME signatures in the spectra of several cool stars

Author

Avramova-Boncheva, Antoaneta, Korhonen, Heidi, Stateva, Ivanka, Antonova, Antoaneta, Brun, Allan Sacha, Bouvier, Jérôme, and Petit, Pascal

Subjects
cool stars, magnetic activity, coronal mass ejection
Abstract

It is critical to look for and estimate CME and flare signatures from late-type stars in order to understand stellar activity and its impact on space weather and planetary atmospheres. Spectroscopic observations of the Hα Balmer line is one of the methods. We present spectroscopic observations of four stars of spectral types G, K, and M. The observations were made over a number of epochs using the NOT/ALFOSC on La Palma and the 2-m RCC telescope/ESPERO at the National Astronomical Observatory of Rozhen. In April, July, and September of 2021, we collected 303 spectra over six nights. With the ALFOSC instrument, we obtained 168 spectra, and the ESPERO instrument, we obtained 135 spectra. The results do not show the events we are looking for, which raises concerns., This research is based on activities supported by the Bulgarian National Science Fund under contract DN 06-Н58/3 – 16.11.2021.

Published
2022
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4. Tau Ori And Tau Lib: Two New Massive Heartbeat Binaries

Author

Pigulski, Andrzej, Kaminska, Monika K., Kaminski, Krzysztof, Paunzen, Ernst, Budaj, Jan, Pribulla, Theodor, Torres, Pascal J., Stateva, Ivanka, Niemczura, Ewa, Skarka, Marek, Alicavus, Filiz Kahraman, Sekeras, Matej, van der Swaelmen, Mathieu, Vanko, Martin, Vanzi, Leonardo, Borisova, Ana, Helminiak, Krzysztof, Alicavus, Fahri, Dimitrov, Wojciech, and Tokarek, Jakub

Subjects
Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics
Abstract

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. tau Lib exhibits shallow eclipses that will soon vanish due to the apsidal motion in the system. In neither system, tidally excited oscillations were detected.

Published
2018

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