5 papers
Study of Massive OBA Stars with X-ray Emission
E. A. Nikolaeva, I. F. Bikmaev, E. N. Irtuganov +3
A study of the physical parameters of a sample of 15 OBA-type stars with detected X-ray emission from the Spektr-RG/eROSITA telescope is presented. While X-ray emission from cool s…
SRG/eROSITA-SDSS view on the relation between X-ray and UV emission for quasars
S. A. Prokhorenko, S. Yu. Sazonov, M. R. Gilfanov +5
Motivated by the idea of using quasars as standardizable candles for cosmology, we examine the relation between X-ray (at 2 keV, ) and ultraviolet (at 2500 Angstrom,…
Is the Fermi source 4FGL J1824.2+1231 a transitional millisecond pulsar?
D. A. Zyuzin, A. V. Karpova, A. Yu. Kirichenko +9
Transitional millisecond pulsars (tMSPs) in tight binary systems represent an important evolutionary link between low-mass X-ray binaries and radio millisecond pulsars. To date, on…
850 SRG/eROSITA X-ray sources associated with Pleiades stars
I. M. Khamitov, I. F. Bikmaev, M. R. Gilfanov +2
Using data from the SRG/eROSITA all-sky X-ray survey and the GAIA-based catalog of 2,209 members of the Pleiades open star cluster, we found 850 X-ray sources associated with the c…
Superflare on a rapidly-rotating solar-type star captured in X-rays
Andrey Mukhin, Roman Krivonos, Ilfan Bikmaev +5
In this work, we studied X-ray source SRGe~J021932.4040154 (SRGe J021932), which we associated with a single X-ray active star of spectral class G2V-G4V and the rotational perio…