Zobrazeno 1 - 10
of 118
pro vyhledávání: '"Gahm, G"'
Autor:
Grinin, V. P., Tambovtseva, L. V., Djupvik, A. A., Gahm, G., Grenman, T., Weber, H., Bengtsson, H., De Angelis, H., Duszanowicz, G., Heinonen, D., Holmberg, G., Karlsson, T., Larsson, M., Warell, J., Wikander, T.
Publikováno v:
MNRAS 2023, 524, 4047
Based on observations obtained with the Nordic Optical Telescope we investigate the spectral variability of the Herbig Ae star RR Tau. This star belongs to the UX Ori family, characterized by very deep fadings caused by the screening of the star with
Externí odkaz:
http://arxiv.org/abs/2308.09688
Publikováno v:
A&A 663, A111 (2022)
Some HII regions that surround young stellar clusters are bordered by molecular shells that appear to expand at a rate inconsistent with our current model simulations. In this study we focus on the dynamics of Sharpless 171 (including NGC 7822), whic
Externí odkaz:
http://arxiv.org/abs/2205.05372
Publikováno v:
A&A 645, A36 (2021)
An intriguing silhouette of a small dust patch can be seen against the disk of the S0 galaxy NGC 3269 in the Antlia cluster in optical images. The images do not provide any clue as to whether the patch is a local Jupiter mass-scale cloudlet or a larg
Externí odkaz:
http://arxiv.org/abs/2011.06988
Autor:
Petrov, P. P., Grankin, K. N., Gameiro, J. F., Artemenko, S. A., Babina, E. V., de Albuquerque, R. M. G., Djupvik, A. A., Gahm, G. F., Shenavrin, V. I., Irsmambetova, T. R., Fernandez, M., Mkrtichian, D. E., Gorda, S. Yu.
Classical T Tauri stars with ages of less than 10 Myr possess accretion discs. Magnetohydrodynamic processes at the boundary between the disc and the stellar magnetosphere control the accretion and ejections gas flows. We carried out a long series of
Externí odkaz:
http://arxiv.org/abs/1811.08635
Publikováno v:
A&A 605, A82 (2017)
The Rosette Nebula is an HII region ionized mainly by the stellar cluster NGC 2244. Elephant trunks, globules, and globulettes are seen at the interface where the HII region and the surrounding molecular shell meet. We have observed a field in the no
Externí odkaz:
http://arxiv.org/abs/1707.05074
Publikováno v:
A&A 577, A73 (2015)
Context. RW Aur A is a classical T Tauri star (CTTS) with an unusually rich emission line spectrum. In 2014 the star faded by ~ 3 magnitudes in the V band and went into a long-lasting minimum. In 2010 the star suffered from a similar fading, although
Externí odkaz:
http://arxiv.org/abs/1503.04158
Publikováno v:
A&A 567, A108 (2014)
Tiny, dense clumps of sub-solar mass called globulettes form in giant galactic HII regions. The young central clusters compress the surrounding molecular shells which break up into clumps, filaments, and elephant trunks that interact with UV light fr
Externí odkaz:
http://arxiv.org/abs/1405.5778
(Abridged) Optical spectra of classical T Tauri stars (cTTS) are rich in emission lines of low-excitation species that are composed of narrow and broad components, related to two regions with different kinematics, densities, and temperatures. The pho
Externí odkaz:
http://arxiv.org/abs/1109.1266
Publikováno v:
Mon.Not.Roy.Astron.Soc. 413 (2011) 2679
Young close binaries open central gaps in the surrounding circumbinary accretion disc, but the stellar components may still gain mass from gas crossing through the gap. It is not well understood how this process operates and how the stellar component
Externí odkaz:
http://arxiv.org/abs/1101.3334
Autor:
Grinin, V., Stempels, H. C., Gahm, G. F., Sergeev, S., Arkharov, A., Barsunova, O., Tambovtseva, L.
The remarkable pre-main-sequence object V718 Per (HMW 15, H187) in the young cluster IC 348 periodically undergoes long-lasting eclipses caused by variable amounts of circumstellar dust in the line-of-sight to the star. It has been speculated that th
Externí odkaz:
http://arxiv.org/abs/0808.1069