Zobrazeno 1 - 10
of 84
pro vyhledávání: '"Potravnov, I."'
The surface magnetic and abundance inhomogeneities in chemically peculiar Ap/Bp stars are coupled and responsible for their rotationally modulated variability. Within the framework of fossil field hypothesis these inhomogeneities are considered to be
Externí odkaz:
http://arxiv.org/abs/2407.13645
We present the results of the spectroscopic study of a chemically peculiar star HD 152564. Using medium-resolution ($R=37000$) observations obtained with the HRS spectrograph mounted on the South African Large Telescope we determined atmospheric para
Externí odkaz:
http://arxiv.org/abs/2312.09594
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 520, Issue 3, April 2023, Pages 3706-3711
It has been shown that during the outburst of accretion activity observed in UX Ori type star RZ Psc in 2013, the accretion rate increased approximately by an order of magnitude. This means that the accretion process at the late stages of the Pre-Mai
Externí odkaz:
http://arxiv.org/abs/2301.11693
We present results of the spectroscopic study of the chemically peculiar star BD+30$^\circ$549 which is bona-fide member of young NGC 1333 star forming region. We found that the star possesses negligible rotation and helium-weak spectroscopic pattern
Externí odkaz:
http://arxiv.org/abs/2301.07856
BP Psc is an active late-type (sp:G9) star with unclear evolutionary status lying at high galactic latitude $b=-57^{\circ}$. It is also the source of the well collimated bipolar jet. We present results of the proper motion and radial velocity study o
Externí odkaz:
http://arxiv.org/abs/2209.07727
Autor:
Müllner, M., Zwintz, K., Corsaro, E., Steindl, T., Potravnov, I., Guenther, E. W., Kniazev, A., Gvaramadze, V.
Publikováno v:
A&A 647, A168 (2021)
In recent years, our understanding of solar-like oscillations from main sequence to red giant stars has improved dramatically thanks to pristine data collected from space telescopes. One of the remaining open questions focuses around the observationa
Externí odkaz:
http://arxiv.org/abs/2012.07878
Publikováno v:
A&A 638, L9 (2020)
Rotation periods inferred from the magnetic variability of some Ap stars are incredibly long, exceeding ten years in some cases. An explanation for such slow rotation is lacking. This paper attempts to provide an explanation of the super-slow rotatio
Externí odkaz:
http://arxiv.org/abs/2003.00684
Publikováno v:
A&A 630, A64 (2019)
We discuss a revision of accretion activity and kinematics of the enigmatic isolated UX Ori type star RZ Psc. Previously, RZ Psc was known to possess only spectroscopic signatures of outflow in the low-excitation lines of alkali metals. The archival
Externí odkaz:
http://arxiv.org/abs/1908.08673
RZ Psc is an isolated high-latitude post-T Tauri star that demonstrates a UX Ori-type photometric activity. The star shows very weak spectroscopic signatures of accretion, but at the same time possesses the unusual footprints of the wind in Na I D li
Externí odkaz:
http://arxiv.org/abs/1701.03312
Autor:
Muthumariappan, C., Parthasarathy, M., Leadbeater, R., Potravnov, I. S., Appakutty, M., Jayakumar, K.
We report high-resolution (R = 30\ 000, 45\ 000 and 75\ 000) echelle and medium-resolution (R = 22\ 000 and 10\ 000) spectroscopic observations of the long-period, eclipsing binary $\epsilon$ Aurigae during the 2009 - 2011 eclipse. Low-excitation she
Externí odkaz:
http://arxiv.org/abs/1409.5493