Autor: Marchev, D. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Spectroscopic solution of the star QX Cas
Autorzy:: Zoła, Stanisław
Marchev, D. V.
Kjurkchieva, D. P.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

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Skocz do pozycji: 2.

Tytuł:: Physical parameters of components in close binary systems. I
Autorzy:: Zakrzewski, B.
Stachowski, G.
Kreiner, J. M.
Kjurkchieva, D.
Baran, A.
Rucinski, S. M.
Ogloza, W.
Marchev, D.
Gazeas, K.
Zoła, Stanisław
Niarchos, P.
Drozdz, M.
Pokrzywka, B.
Opis:: The paper presents combined spectroscopic and photometric orbital solutions for four close binary systems: SW Lyn, QW Gem, AP Leo and V2150 Cyg. The photometric data are new, while the spectroscopy has been recently obtained within the radial velocity programme at the David Dunlap Observatory. This paper is the first in the planned series of investigations. We give an extensive description of the motivation for the series and of the main assumptions made in our solutions. The four targets of this investigation span a range of typical configurations and thus present different levels of difficulty for the combined spectroscopic and photometric orbital solutions.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

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Skocz do pozycji: 3.

Tytuł:: Physical parameters of components in close binary systems. V
Autorzy:: Siwak, Michał
Drozdz, M.
Kjurkchieva, D. P.
Kozieł-Wierzbowska, Dorota
Zakrzewski, B.
Pokrzywka, B.
Zoła, Stanisław
Ogloza, W.
Baran, A.
Marchev, D. V.
Rucinski, S. M.
Kreiner, J. M.
Opis:: The paper presents combined spectroscopic and photometric orbital solutions for ten close binary systems: CN And, V776 Cas, FU Dra, UV Lyn, BB Peg, V592 Per, OU Ser, EQ Tau, HN UMa and HT Vir. The photometric data consist of new multicolor light curves, while the spectroscopy has been recently obtained within the radial velocity program at the David Dunlap Observatory (DDO). Absolute parameters of the components for these binary systems are derived. Our results confirm that CN And is not a contact system. Its configuration is semi-detached with the secondary component filling its Roche lobe. The configuration of nine other systems is contact. Three systems (V776 Cas, V592 Per and OU Ser) have high (44-77%) and six (FU Dra, UV Lyn, BB Peg, EQ Tau, HN UMa and HT Vir) low or intermediate (8-32%) fill-out factors. The absolute physical parameters are derived.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

na półce

Skocz do pozycji: 4.

Tytuł:: The W UMa-type Stars Program : first results, current status and perspectives
Autorzy:: Zakrzewski, B.
Stachowski, G.
Kreiner, J. M.
Kjurkchieva, D.
Niarchos, P. G.
Siwak, Michał
Kozieł-Wierzbowska, Dorota
Rucinski, S. M.
Ogloza, W.
Marchev, D.
Gazeas, K.
Zoła, Stanisław
Drozdz, M.
Pokrzywka, B.
Opis:: We present the results of a statistical investigation of the period-color and period-bolometric magnitude relations using a carefully selected sample of 120 contact systems with known physical parameters.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

Artykuł

na półce

Skocz do pozycji: 5.

Tytuł:: Physical parameters of close binary systems : VIII
Autorzy:: Zakrzewski, B.
Stachowski, G.
Kreiner, J. M.
Kjurkchieva, D.
Baran, A.
Erdem, A.
Szalankiewicz, S.
Kozieł-Wierzbowska, Dorota
Drozdz, M.
Rucinski, S. M.
Ogloza, W.
Siwak, M.
Marchev, D.
Gazeas, K.
Zoła, Stanisław
Liakos, A.
Opis:: This paper presents the results of a combined spectroscopic and photometric study of 20 contact binary systems: HV Aqr, OO Aql, FI Boo, TX Cnc, OT Cnc, EE Cet, RW Com, KR Com, V401 Cyg, V345 Gem, AK Her, V502 Oph, V566 Oph, V2612 Oph, V1363 Ori, V351 Peg, V357 Peg, Y Sex, V1123 Tau, and W UMa, which was conducted in the frame of the W UMa Project. Together with 51 already covered by the project and an additional 67 in the existing literature, these systems bring the total number of contact binaries with known combined spectroscopic and photometric solutions to 138. It was found that mass, radius, and luminosity of the components follow certain relations along the MS and new empirical power relations are extracted. We found that 30 per cent of the systems in the current sample show extreme values in their parameters, expressed in their mass ratio or fill-out factor. This study shows that, among the contact binary systems studied, some have an extremely low mass ratio (q < 0.1) or an ultrashort orbital period (Porb < 0.25 d), which are expected to show evidence of mass transfer progress. The evolutionary status of these components is discussed with the aid of correlation diagrams and their physical and orbital parameters compared to those in the entire sample of known contact binaries. The existence of very short orbital periods confirms the very slow nature of the merging process, which seems to explain why their components still exist as MS stars in contact configurations even after several Gyr of evolution.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego