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pro vyhledávání: '"Andrievsky, Sergei"'
We carried out a new attempt to check for the presence promethium lines in the spectrum of HD101065 (Przybylski's star). The neutron capture element promethium does not have stable isotopes and the maximum half-life time is about 18 years. Thus its p
Externí odkaz:
http://arxiv.org/abs/2304.13623
The Przybylski star spectrum has been studied in order to search for deuterium lines. Since this star is extremely enriched in the s-process elements, which are the product of interaction between free neutrons and seed nuclei, we might as well expect
Externí odkaz:
http://arxiv.org/abs/2302.02487
Autor:
Andrievsky, Sergei M., Korotin, Sergey A., Kovtyukh, Valery V., Khrapaty, Sergey V., Rudyak, Yuri
For the first time, a direct NLTE analysis of carbon and nitrogen lines in the spectra of nine RR Lyrae stars was carried out. We have determined the abundances of these elements together with oxygen, and have shown that the nitrogen content is incre
Externí odkaz:
http://arxiv.org/abs/2106.16109
Autor:
Ivanova, Oleksandra V., Picazzio, Enos, Luk'yanyk, Igor V., Cavichia, Oscar, Andrievsky, Sergei M.
We carried out photometric and spectroscopic observations of comet 29P/ Schwassmann-Wachmann 1 at the SOAR 4.1-meter telescope (Chile) on August 12, 2016. This paper presents the results of only spectroscopic analysis. The spectra revealed presence o
Externí odkaz:
http://arxiv.org/abs/1805.06715
Autor:
D'Orazi, Valentina, Desidera, Silvano, Gratton, Raffaele, Lanza, Antonino F., Messina, Sergio, Andrievsky, Sergei M., Korotin, Sergey, Benatti, Serena, Bonnefoy, Mickael, Covino, Elvira, Janson, Markus
Publikováno v:
A&A 598, A19 (2017)
The recent development of brand new observational techniques and theoretical models have greatly advanced the exoplanet research field. Despite significant achievements, which have allowed the detection of thousands extrasolar systems, a comprehensiv
Externí odkaz:
http://arxiv.org/abs/1609.02530
Autor:
Skuladottir, Asa, Andrievsky, Sergei M., Tolstoy, Eline, Hill, Vanessa, Salvadori, Stefania, Korotin, Sergey A., Pettini, Max
In Galactic halo stars, sulphur has been shown to behave like other $\alpha$-elements, but until now, no comprehensive studies have been done on this element in stars of other galaxies. Here, we use high-resolution ESO VLT/FLAMES/GIRAFFE spectra to d
Externí odkaz:
http://arxiv.org/abs/1505.03155
Autor:
D'Orazi, Valentina, Biazzo, Katia, Desidera, Silvano, Covino, Elvira, Andrievsky, Sergei M., Gratton, Raffaele G.
Recently, several studies have shown that young, open clusters are characterised by a considerable over-abundance in their barium content. In particular, D'Orazi et al. (2009) reported that in some younger clusters [Ba/Fe] can reach values as high as
Externí odkaz:
http://arxiv.org/abs/1204.2635
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