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110 papers
A multiwavelength study of the flat spectrum radio-quasar NVSS J141922-083830 covering four flaring episodes
D. A. H. Buckley, R. J. Britto, S. Chandra +9
We present multiwavelength observations and a model for flat spectrum radio quasar NVSS J141922-083830, originally classified as a blazar candidate of unknown type (BCU II object)…
A search for period changes of eight short-period Type II Cepheids
Alemiye M. Yacob, Leonid N. Berdnikov, Elena N. Pastukhova +2
In this study, we investigate the period changes of eight short-period Type II Cepheids of the BL Her subtype, i.e., with periods in the 1-4 day range. The diagrams for these…
SALT observations of the supernova remnant MCSNR J0127-7332 and its associated Be X-ray binary SXP 1062 in the SMC
V. V. Gvaramadze, A. Y. Kniazev, J. S. Gallagher +4
We report the results of optical spectroscopy of the Small Magellanic Cloud supernova remnant (SNR) MCSNR J0127-7332 and the mass donor Be star, 2dFS 3831, in its associated high-m…
New luminous blue variable candidates in the NGC 247 galaxy
Y. Solovyeva, A. Vinokurov, A. Sarkisyan +6
We search for LBV stars in galaxies outside the Local Group. Here we present a study of two bright sources in the NGC 247 galaxy. Object j004703.27-204708.4 ($M_V=-9.08 \pm 0.…
The structure of stellar disks in isolated lenticular galaxies
Olga K. Sil'chenko, Alexei Yu. Kniazev, Ekaterina M. Chudakova
We have obtained imaging data in two photometric bands, g and r, for a sample of 42 isolated lenticular galaxies with the Las Cumbres Observatory one-meter telescope network. We ha…
Direct evidence for shock-powered optical emission in a nova
Elias Aydi, Kirill V. Sokolovsky, Laura Chomiuk +39
Classical novae are thermonuclear explosions that occur on the surfaces of white dwarf stars in interacting binary systems (Bode & Evans 2008). It has long been thought that the lu…