Zobrazeno 1 - 10
of 34
pro vyhledávání: '"Kolka, Indrek"'
Autor:
Põder, Sven, Benito, María, Pata, Joosep, Kipper, Rain, Ramler, Heleri, Hütsi, Gert, Kolka, Indrek, Thomas, Guillaume F.
Publikováno v:
A&A, 676 (2023) A134
Our goal is to calculate the circular velocity curve of the Milky Way, along with corresponding uncertainties that quantify various sources of systematic uncertainty in a self-consistent manner. The observed rotational velocities are described as cir
Externí odkaz:
http://arxiv.org/abs/2309.02895
Autor:
Folsom, Colin P., Kama, Mihkel, Eenmäe, Tõnis, Kolka, Indrek, Aret, Anna, Checha, Vitalii, Kasikov, Anni, Leedjärv, Laurits, Ramler, Heleri
Publikováno v:
A&A 658, A105 (2022)
Context: Few exoplanets around hot stars with radiative envelopes have been discovered, although new observations from the TESS mission are improving this. Stars with radiative envelopes have little mixing at their surface, and thus their surface abu
Externí odkaz:
http://arxiv.org/abs/2111.07526
Autor:
Kraus, Michaela, Kolka, Indrek, Aret, Anna, Nickeler, Dieter H., Maravelias, Grigoris, Eenmäe, Tõnis, Lobel, Alex, Klochkova, Valentina G.
Yellow hypergiants are evolved massive stars that were suggested to be in post-red supergiant stage. Post-red supergiants that evolve back to the blue, hot side of the Hertzsprung-Russell diagram can intersect a temperature domain in which their atmo
Externí odkaz:
http://arxiv.org/abs/1812.03065
B[e] supergiants and yellow hypergiants share a number of common properties regarding their circumstellar environments. Using the forbidden [O I] and [Ca II] lines as disk tracers, we suggest the presence of a Keplerian disk or ring around the yellow
Externí odkaz:
http://arxiv.org/abs/1611.06044
Spectroscopic monitoring of the yellow hypergiant $\rho$ Cas revealed a new outburst in 2013, which is obvious from the development of TiO bands in the spectra. Also many atmospheric lines characteristic for a later spectral type appear. This spectro
Externí odkaz:
http://arxiv.org/abs/1611.04493
Yellow Hypergiants (YHGs) and B[e] supergiants (B[e]SGs), though in different phases in their evolution, display many features in common. This is partly due to the fact that both types of objects undergo strong, often asymmetric mass loss, and the ej
Externí odkaz:
http://arxiv.org/abs/1611.04490
Publikováno v:
A&A 598, A108 (2017)
The stellar evolution theory of massive stars remains uncalibrated with high-precision photometric observational data mainly due to a small number of luminous stars that are monitored from space. Automated all-sky surveys have revealed numerous varia
Externí odkaz:
http://arxiv.org/abs/1611.02452
Publikováno v:
A&A 581, A37 (2015)
Context. Mass loss is an important property in evolution models of massive stars. As up to 90% of the massive stars have a visual or spectroscopic companion and many of them exhibit mass exchange, mass-loss rates can be acquired through the period st
Externí odkaz:
http://arxiv.org/abs/1507.00180
Autor:
Martayan, Christophe, Fremat, Yves, Blomme, Ronny, Jonckheere, Anthony, Borges, Marcelo, De Batz, Bertrand, Leroy, Bernard, Sordo, Rosanna, Bouret, Jean-Claude, Martins, Fabrice, Zorec, Jean, Neiner, Coralie, Nazé, Yael, Alecian, Evelyne, Floquet, Michele, Hubert, Anne-Marie, Briot, Danielle, Miroshnichenko, Anatholy, Kolka, Indrek, Stee, Philippe, Lanz, Thierry, Meynet, Georges
The Gaia satellite will be launched at the end of 2011. It will observe at least 1 billion stars, and among them several million emission line stars and hot stars. Gaia will provide parallaxes for each star and spectra for stars till V magnitude equa
Externí odkaz:
http://arxiv.org/abs/0809.4417
Publikováno v:
Zenodo
V509 Cas is one of the rare evolved massive stars known as yellow hypergiants. These stars are in an unstable phase of evolution, during which their atmospheres undergo recurring outbursts. Over the 20th century, V509 Cas went through multiple erupti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::076b2ee1ef250aa120c1242a78a893e1