2018 год
| № | Название статьи | Авторы | Название журнала | Краткая аннотация | Ссылка |
| 1 | Toward Understanding the B[e] Phenomenon. VII. AS 386, a Single-lined Binary with a Candidate Black Hole Component | Khokhlov, S.A., Miroshnichenko, A.S., Zharikov, S.V., Agishev, A..Kouprianov, V.V., Haislip, J.B. |
Astrophysical Journal Q1 in Physics and Astronomy |
We report the results of spectroscopic and photometric observations of the emission-line object AS 386. For the first time we found that it exhibits the B[e] phenomenon and fits the definition of an FS CMa type object. The optical spectrum shows the presence of a B-type star with the following properties: T eff = 11,000 ± 500 K, log L/L o = 3.7 ± 0.3, a mass of 7 ± 1 M o, and a distance D = 2.4 ± 0.3 kpc from the Sun. We detected regular radial velocity variations of both absorption and emission lines with the following orbital parameters: P orb =131.27 ± 0.09 days, semiamplitude K 1 = 51.7 ± 3.0 km s-1, systemic radial velocity γ = -31.8 ± 2.6 km s-1, and a mass function of f(m) = 1.9 ± 0.3 M o. AS 386 exhibits irregular variations of the optical brightness (V = 10.92 ± 0.05 mag), while the near-IR brightness varies up to ∼0.3 mag following the spectroscopic period. We explain this behavior by a variable illumination of the dusty disk inner rim by the B-type component. Doppler tomography based on the orbital variations of emission-line profiles shows that the material is distributed near the B-type component and in a circumbinary disk. We conclude that the system has undergone a strong mass transfer that created the circumstellar material and increased the B-type component mass. The absence of any traces of a secondary component, whose mass should be ≥7 M o, suggests that it is most likely a black hole. |
https://www.scopus.com/record/display.uri?eid=2-s2.0-85045535987&origin=resultslist&sort=plf-f |
| 2 | High-mass Outflows Identified from COHRS CO (3-2) Survey | Li, Q., Zhou, J., Esimbek, J., ...Ji, W., Zhexeray, D. |
Astrophysical Journal Q1 in Physics and Astronomy |
An unbiased search of molecular outflows within the region of the CO High Resolution survey has identified 157 high-mass outflows from a sample of 770 APEX Telescope Large Area Survey of the Galaxy clumps with a detection rate of 20%. The detection rate of outflows increases for clumps with higher M clump, L bol, L bol/M clump, NH2, and T dust compared to the clumps with no outflow. The detection rates of the outflow increase from protostellar (8%) to young stellar object clump (17%) to massive star-forming clump (29%). The detection rate 26% for quiescent clump is preliminary, because the sample of quiescent clumps is small. A statistical relation between the outflow and clump masses for our sample is log(Mout M⊙) = (-1.1 ± 0.21) + (0.9 ± 0.07)log(Mclump M⊙). The detection rate of outflows and the outflow mass-loss rate show an increase with increasing M clump, L bol, NH2, and T dust, which indicates that clumps with outflow with higher parameter values are at a more advanced evolutionary stage. The outflow mechanical force increases with increasing bolometric luminosities. No clear evidence has yet been found that higher-mass outflows have different launching conditions than low-mass outflows. |
https://www.scopus.com/record/display.uri?eid=2-s2.0-85056693619&origin=resultslist&sort=plf-f |
| 3 | Chemical model for positively charged dust particles | Davletov, A.E., Kurbanov, F., Mukhametkarimov, Y.S. |
Physics of Plasmas Q2 in Condensed Matter Physics |
A chemical model of electron-dust plasmas consisting of electrons and dust particles is systematically developed. An insight is exploited that a single dust particle forms a potential well for electrons, whose depth is determined by the work function of the dust material. The whole electron fluid, initially concentrated inside the dust particles, is somehow reallocated between the bulk of the dust matter and the ambient space available, which is then interpreted as thermionic emission. An expression is employed for the Helmholtz free energy of the system, which includes the ideal and excess parts to thoroughly deal with interactions between the dusty plasma constituents. Numerical calculations of dust particle charge are performed in quite a broad domain of plasma parameters, and a straightforward comparison is made with the orbital motion limited (OML) approximation to demonstrate that the proposed calculation scheme predicts higher positive charge values of dust grains. It is also proved that the OML approximation exactly corresponds to the ideal-gas model when interactions between plasma particles are entirely neglected. |
https://www.scopus.com/record/display.uri?eid=2-s2.0-85057716637&origin=resultslist&sort=plf-f |
| 4 | Dust particles of finite dimensions in complex plasmas: Thermodynamics and dust-acoustic wave dispersion | Davletov, A.E., Yerimbetova, L.T., Arkhipov, Yu.V., Mukhametkarimov Ye.S..Kissan, A., Tkachenko, I.M. |
Journal of Plasma Physics Q2 in Condensed Matter Physics |
Grounded on the premise that dust particles are charged hard balls, the analysis in Davletov et al. (Contrib. Plasma Phys., vol. 56, 2016, 308) provides an original pseudopotential model of intergrain interaction in complex (dusty) plasmas. This accurate model is engaged herein to consistently treat the finite-size effects from the process of dust particle charging to determination of the thermodynamic quantities and the dust-acoustic wave dispersion in the strongly coupled regime. The orbital motion limited approximation is adopted to evaluate an electric charge of dust grains immersed in a neutralizing background of the buffer plasma. To account for finite dimensions of dust particles, the radial distribution function is calculated within the reference hypernetted-chain (RHNC) approximation to demonstrate a well-pronounced short-range order formation at rather large values of the coupling parameter and the packing fraction. The evaluated excess pressure of the dust component is compared to the available theoretical approaches and the simulation data and is then used to predict the dust-acoustic wave (DAW) dispersion in the strongly coupled regime under the assumption that the dust particles charge varies in the course of propagation. In contrast to many previous investigations, it is demonstrated for the first time ever that for DAWs the charge variation of dust particles should necessarily be taken into account while evaluating the dust isothermal compressibility. |
https://www.scopus.com/record/display.uri?eid=2-s2.0-85057311386&origin=resultslist&sort=plf-f |
| 5 | IRAS 22150+6109 - A young B-type star with a large disc | Zakhozhay, O.V., Miroshnichenko, A.S., Kuratov, K.S., ...Zharikov, S.V., Manset, N. Khokhlov, S.A |
Monthly Notices of the Royal Astronomical Society Q1 in Space and Planetary Science |
We present the results of a spectroscopic analysis and spectral energy distribution (SED) modelling of the optical counterpart of the infrared source IRAS 22150+6109. The source was suggested to be a Herbig Be star located in the star-forming region L 1188. Absorption lines in the optical spectrum indicate a spectral type B3, while weak Balmer emission lines reflect the presence of a circumstellar gaseous disc. The star shows no excess radiation in the near-infrared spectral region and a strong excess in the far-infrared that we interpret as radiation from a large disc, the inner edge of which is located very far from the star (550 au) and does not attenuate its radiation. We conclude that IRAS 22150+6109 is an intermediate-mass star that is currently undergoing a short pre-main-sequence evolutionary stage. |
https://www.scopus.com/record/display.uri?eid=2-s2.0-85046647885&origin=resultslist&sort=plf-f |
| 6 | Toward Understanding the B[e] Phenomenon. VII. AS 386, a Single-lined Binary with a Candidate Black Hole Component | Khokhlov, S.A., Miroshnichenko, A.S., Zharikov, S.V., Kouprianov, V.V., Haislip, J.B. Khokhlov, S.A. |
Astrophysical Journal Q1 in Physics and Astronomy
|
We report the results of spectroscopic and photometric observations of the emission-line object AS 386. For the first time we found that it exhibits the B[e] phenomenon and fits the definition of an FS CMa type object. The optical spectrum shows the presence of a B-type star with the following properties: T eff = 11,000 ± 500 K, log L/L o = 3.7 ± 0.3, a mass of 7 ± 1 M o, and a distance D = 2.4 ± 0.3 kpc from the Sun. We detected regular radial velocity variations of both absorption and emission lines with the following orbital parameters: P orb =131.27 ± 0.09 days, semiamplitude K 1 = 51.7 ± 3.0 km s-1, systemic radial velocity γ = -31.8 ± 2.6 km s-1, and a mass function of f(m) = 1.9 ± 0.3 M o. AS 386 exhibits irregular variations of the optical brightness (V = 10.92 ± 0.05 mag), while the near-IR brightness varies up to ∼0.3 mag following the spectroscopic period. We explain this behavior by a variable illumination of the dusty disk inner rim by the B-type component. Doppler tomography based on the orbital variations of emission-line profiles shows that the material is distributed near the B-type component and in a circumbinary disk. We conclude that the system has undergone a strong mass transfer that created the circumstellar material and increased the B-type component mass. The absence of any traces of a secondary component, whose mass should be ≥7 M o, suggests that it is most likely a black hole. |
https://www.scopus.com/record/display.uri?eid=2-s2.0-85045535987&origin=resultslist&sort=plf-f |
| 7 | Simultaneous observation of lightning emission in different wave ranges of electromagnetic spectrum in Tien Shan mountains | Gurevich, A.V., Garipov, G.K., Almenova, A.M., Mukashev, K..Zhukov, V.V., Zybin, K.P. |
Atmospheric Research Q1 in Atmospheric Science |
Simultaneous registration of electromagnetic emission generated by atmospheric lightning discharges in the radio-frequency (f = 0.1–30 MHz), infrared (λ = 610–800 nm), ultraviolet (λ = 240–380 nm), and in the soft energy gamma-radiation (Eγ = 0.1–4 MeV) ranges of electromagnetic spectrum was made synchronously in mountain conditions with complex detector system of the Tien Shan High-Mountain Cosmic Ray Station. We discuss preliminary results of these measurements and perspectives of future application of the multispectral investigation technique to study of the effects of thunderstorm activity. |
https://www.scopus.com/record/display.uri?eid=2-s2.0-85047414085&origin=resultslist&sort=plf-f |
| 8 | Hydrogenation of p-Nitrobenzoic Acid by Gold and Palladium Nanoparticles Immobilized Within Macroporous Amphoteric Cryogels in Aqueous Solution | Kudaibergenov, S., Dauletbekova, M., Toleutay, G., Seilkhanov, T., Abdullin, K |
Journal of Inorganic and Organometallic Polymers and Materials Q2 in Polymers and Plastics |
Aqueous solutions of sodium salt of p-nitrobenzoic acid (p-NBA) were hydrogenated in mild conditions in the presence of palladium (PdNPs) and gold nanoparticles (AuNPs) immobilized within macroporous amphoteric cryogel based on N,N-dimethylaminoethylmethacrylate (DMAEM) and methacrylic acid (MAA). The morphology of the macroporous catalyst DMAEM-co-MAA/AuNPs was characterized using SEM. The pore sizes of sponge-like porous structure of cryogels are in the range of 5–40 µm, while the average sizes of AuNPs immobilized within the macroporous amphoteric cryogel are 80 ± 20 nm. The reduction of p-NBA to p-aminobenzoic acid (p-ABA) and further to by-products p,p′-azodibenzoate and sodium 4-(4-aminobenzamido)benzoate was confirmed by Raman and 1H NMR spectroscopy. The conversion degree, kinetic parameters, and activation energies of hydrogenation of p-NBA were found. |
https://www.scopus.com/record/display.uri?eid=2-s2.0-85050591404&origin=resultslist&sort=plf-f |