Shulyak, Denis V.

[["dc.bibliographiccitation.firstpage","2548"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Monthly Notices of the Royal Astronomical Society"],["dc.bibliographiccitation.lastpage","2557"],["dc.bibliographiccitation.volume","418"],["dc.contributor.author","Shulyak, D."],["dc.contributor.author","Seifahrt, Andreas"],["dc.contributor.author","Reiners, Ansgar"],["dc.contributor.author","Kochukhov, Oleg"],["dc.contributor.author","Piskunov, Nikolai E."],["dc.date.accessioned","2018-11-07T08:49:03Z"],["dc.date.available","2018-11-07T08:49:03Z"],["dc.date.issued","2011"],["dc.description.abstract","Close M dwarf binaries and higher multiples allow the investigation of rotational evolution and mean magnetic flux unbiased from scatter in inclination angle and age since the orientation of the spin axis of the components is most likely parallel and the individual systems are coeval. Systems composed of an early-type (M0.0-M4.0) and a late-type (M4.0-M8.0) component offer the possibility to study differences in rotation and magnetism between partially and fully convective stars. We have selected 10 of the closest dM systems to determine the rotation velocities and the mean magnetic field strengths based on spectroscopic analysis of FeH lines of Wing-Ford transitions at 1 mu m observed with Very Large Telescope/CRIRES. We also studied the quality of our spectroscopic model regarding atmospheric parameters including metallicity. A modified version of the Molecular Zeeman Library (MZL) was used to compute Landeg-factors for FeH lines. Magnetic spectral synthesis was performed with the synmast code. We confirmed previously reported findings that less massive M dwarfs are braked less effectively than objects of earlier types. Strong surface magnetic fields were detected in primaries of four systems (GJ 852, GJ 234, LP 717-36 and GJ 3322), and in the secondary of the triple system GJ 852. We also confirm strong 2-kG magnetic field in the primary of the triple system GJ 2005. No fields could be accurately determined in rapidly rotating stars with nu sin i > 10 km s(-1). For slowly and moderately rotating stars, we find the surface magnetic field strength to increase with the rotational velocity nu sin i which is consistent with other results from studying field stars."],["dc.identifier.doi","10.1111/j.1365-2966.2011.19644.x"],["dc.identifier.isi","000298088100036"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/21363"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-blackwell"],["dc.relation.issn","0035-8711"],["dc.title","Rotation, magnetism and metallicity of M dwarf systems"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Astronomy Reports"],["dc.bibliographiccitation.lastpage","42"],["dc.bibliographiccitation.volume","60"],["dc.contributor.author","Boyarchuk, A. A."],["dc.contributor.author","Shustov, B. M."],["dc.contributor.author","Savanov, I. S."],["dc.contributor.author","Sachkov, M. E."],["dc.contributor.author","Bisikalo, D. V."],["dc.contributor.author","Mashonkina, L. I."],["dc.contributor.author","Wiebe, D. Z."],["dc.contributor.author","Shematovich, V. I."],["dc.contributor.author","Shchekinov, Yu. A."],["dc.contributor.author","Chugai, N. N."],["dc.contributor.author","Ivanov, P. B."],["dc.contributor.author","Voshchinnikov, N. V."],["dc.contributor.author","Lamzin, S. A."],["dc.contributor.author","Ayres, T."],["dc.contributor.author","Strassmeier, K. G."],["dc.contributor.author","Jeffrey, S."],["dc.contributor.author","Zwintz, S. K."],["dc.contributor.author","Shulyak, D."],["dc.contributor.author","Hubert, B."],["dc.contributor.author","Lammer, H."],["dc.contributor.author","Zhilkin, A. G."],["dc.contributor.author","Kaigorodov, P. V."],["dc.contributor.author","Sichevskii, S. G."],["dc.contributor.author","Ustamuich, S."],["dc.contributor.author","Kanev, E. N."],["dc.contributor.author","Ryabchikova, Tanya"],["dc.contributor.author","Gomez de Castro, Ana I."],["dc.contributor.author","Piskunov, Nikolai E."],["dc.contributor.author","Gerard, J.-C."],["dc.contributor.author","Fossati, Luca"],["dc.contributor.author","Werner, Katharina"],["dc.contributor.author","Kil'pio, E. Yu."],["dc.date.accessioned","2020-12-10T18:37:11Z"],["dc.date.available","2020-12-10T18:37:11Z"],["dc.date.issued","2016"],["dc.description.abstract","The article presents a review of scientific problems and methods of ultraviolet astronomy, focusing on perspective scientific problems (directions) whose solution requires UV space observatories. These include reionization and the history of star formation in the Universe, searches for dark baryonic matter, physical and chemical processes in the interstellar medium and protoplanetary disks, the physics of accretion and outflows in astrophysical objects, from Active Galactic Nuclei to close binary stars, stellar activity (for both low-mass and high-mass stars), and processes occurring in the atmospheres of both planets in the solar system and exoplanets. Technological progress in UV astronomy achieved in recent years is also considered. The well advanced, international, Russian-led Spektr-UV (World Space Observatory-Ultraviolet) project is described in more detail. This project is directed at creating a major space observatory operational in the ultraviolet (115-310 nm). This observatory will provide an effective, and possibly the only, powerful means of observing in this spectral range over the next ten years, and will be an powerful tool for resolving many topical scientific problems."],["dc.identifier.doi","10.1134/S1063772916010017"],["dc.identifier.eissn","1562-6881"],["dc.identifier.isi","000368685900001"],["dc.identifier.issn","1063-7729"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/76867"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Maik Nauka/interperiodica/springer"],["dc.relation.issn","1562-6881"],["dc.relation.issn","1063-7729"],["dc.title","Scientific problems addressed by the Spektr-UV space project (world space Observatory-Ultraviolet)"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]