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Chemical composition of a palomar 12 blue straggler
Pasquini, L.; Bonifacio, P.; Randich, S. +5 more
With the equivalent area of a 16-m telescope, ESPRESSO in 4UT mode allows to inaugurate high resolution spectroscopy for solar-type stars belonging to extragalactic globular clusters. We determine the chemical composition of an extragalactic blue straggler (BS). The star has a G magnitude of 19.01 and belongs to the globular cluster Pal12, that is…
A Gap at 1 au in the Disk of DI Cha A Revealed by Infrared Interferometry
Pál, András; Moór, Attila; Ábrahám, Péter +6 more
DI Cha A is K0-type pre-main-sequence star, the brightest component of a quadruple stellar system. Here we report on a detailed study of this star based on archival VLTI/MIDI and VLTI/PIONIER infrared interferometric observations, as well as optical-infrared photometric monitoring from ground-based and space-born instruments. We determined the str…
Cometocentric coordinates of the tail axis of comet 67P/Churyumov-Gerasimenko
Ibragimov, A. A.
In this paper, we consider errors in the measurement of cometocentric coordinates. The sequence of actions for determining the cometocentric coordinates by perspective projection of the image points of the comet onto the orbital plane is given on the example of comet 67P. Conditions are shown that increase the accuracy of determining the angle of …
Similarities and Differences of SARs in Solar Cycle 24
Li, Ting; Wang, Jingxiu; Chen, Anqin
Solar Cycle 24 is a particularly weak cycle and there are only six super active regions (SARs). Except for NOAA active region (AR) 12192, all other SARs are coronal mass ejection rich (CME-rich) and produced CMEs faster than 1000 kms−1. By studying the similarities and differences between CME-poor SARs and CME-rich SARs in Solar Cycle 2…
First Byurakan Spectral Survey. Late-Type Stars. Dwarfs
Gigoyan, K. K.; Gigoyan, K. S.; Kostandyan, G. R. +5 more
A total of 18 lists of the First Byurakan Survey of Late-Type Stars (FBS LTS) were published between 1990 and 2016. The stars were found on FBS low-dispersion spectral plates. A systematic search and selection were carried out on a surface of ∼16 000 deg^2 on almost the whole area of the FBS. Since 2007, all FBS low-resolution spectral plates have…
X-ray characterisation of the massive galaxy cluster ClG J104803.7+313843 at z = 0.76 with XMM-Newton
Rossetti, M.; Bartalucci, I.; Molendi, S. +6 more
We present the characterisation of the massive cluster ClG J104803.7+313843 at z = 0.76 performed using a serendipitous XMM-Newton observation. High redshift and massive objects represent an ideal laboratory to benchmark our understanding of how clusters form and assembly formation is mainly driven by gravity. Leveraging the high throughput of XMM…
X-ray investigation of the X-ray source 1RXS J121902.7-630910 with Suzaku
Bakis, Hicran; Raycheva, Nergis C.; Sezer, Aytap +1 more
We present a study of the unidentified X-ray source 1RXS J121902.7-630910 based on Suzaku X-ray Imaging Spectrometer observation. We aim at clarifying the nature of the emission from 1RXS J121902.7-630910. We found that the spectrum is well represented by a thermal plasma model with an electron temperature of kTe ∼ 3.7 keV, the upper li…
Galactic cosmic ray transport in inner heliosphere: Study with ion chamber and neutron monitor data for 1936-2006
Modzelewska, R.; Ahluwalia, H. S.; Gololobov, P. Yu.
Galactic cosmic ray (GCR) solar diurnal variation data recorded by shielded ion chambers at Cheltenham/Fredericksburg (CH-IC) and Yakutsk (Yak-IC) are corrected for diurnal temperature variation in upper atmosphere and used to calculate the ratio α of GCR free paths normal (λ⊥) and parallel (λ||) to mean interplanetary magnetic field (I…
Solar Photospheric Magnetic Fields, Coronal Mass Ejections, and Type II Radio Bursts in Cycles 23 and 24
Bilenko, I. A.
We consider the events of type II radio bursts (RBII) in the decametric and hectometric ranges from 1 to 16 MHz and the dependence of the parameters of associated coronal mass ejections (CMEs) on the background characteristics of the plasma and interplanetary magnetic field (IMF) in the regions where each radio burst was detected in solar cycles 2…
Correction to: The Psyche Topography and Geomorphology Investigation
Williams, David A.; Bell, James F.; Jaumann, Ralf +16 more