Results 91 to 100 of about 3,913,690 (210)

History of two mass loss processes in VY CMa. [PDF]

Proc Int Astron Union, 2023
Quintana-Lacaci G, Velilla L, Fonfría JP, Cernicharo J, Castro-Carrizo A, Agúndez M, Decin L.   +6 more
europepmc   +1 more source

218. Red supergiants: the biggest stars

The biggest stars have radii some 1500 times that of the Sun. Although extremely luminous, their detection poses a number of challenges, and their large distances make them difficult to characterise. I explain their importance for understanding stellar evolution, and the ways in which Gaia is contributing.
openaire   +1 more source

VLTI/AMBER studies of the atmospheric structure and fundamental parameters of red giant and supergiant stars [Elektronisk resurs]

, 2015
We present recent near-IR interferometric studies of red giant and supergiant stars, which are aimed at obtaining information on the structure of the atmospheric layers and at constraining the fundamental parameters of these objects.
Arroyo-Torres, B., Wood, P. R., Wittkowski, M., Abellan, F. J., Hauschildt, P. H., Scholz, M., Chiavassa, A., Marcaide, J. M., Quirrenbach, A., Marti-Vidal, Ivan,, Freytag, B., Guirado, J. C., Fabregat, J.   +12 more
core  

Detection of Rydberg Lines from the Atmosphere of Betelgeuse

The Astrophysical Journal Letters
Emission lines from Rydberg transitions are detected for the first time from a region close to the surface of Betelgeuse. The H30 α line is observed at 231.905 GHz, with an FWHM ∼42 km s ^−1 and extended wings. A second line at 232.025 GHz (FWHM ∼21 km s
W. R. F. Dent, G. M. Harper, A. M. S. Richards, P. Kervella, L. D. Matthews   +4 more
doaj   +1 more source

Spectroscopic evidence for a large spot on the dimming Betelgeuse. [PDF]

Nat Commun, 2021
Alexeeva S, Zhao G, Gao DY, Du J, Li A, Li K, Hu S.   +6 more
europepmc   +1 more source

Surface rotation of Kepler red giant stars [PDF]

, 2017
Kepler allows the measurement of starspot variability in a large sample of field red giants for the first time. With a new method that combines autocorrelation and wavelet decomposition, we measure 361 rotation periods from the full set of 17,377 ...
van Saders, J., P. G. Beck, S. Bloemen, Mathur, S., Pinsonneault, M.H., Ceillier, T., Tayar, J., Stello, D., D. Salabert, R. A. García, Bloemen, S., Saders, J. van, J. van Saders, Salabert, D., Garcia, R. A., García, R.A., T. Ceillier, S. Mathur, M. H. Pinsonneault, D. Stello, Beck, P.G., J. Tayar   +21 more
core   +2 more sources

The Infrared-bright SW Knots in the Complex Ejecta of VY CMa

The Astronomical Journal
The red hypergiant VY CMa is remarkable for its very visible record of high-mass-loss events observed over the range of wavelengths from the optical and infrared to the submillimeter region with Atacama Large Millimeter/submillimeter Array (ALMA). The SW
Roberta M. Humphreys, Terry J. Jones, Kris Davidson, A. M. S. Richards, R. Ravi, A. P. Singh, L. M. Ziurys   +6 more
doaj   +1 more source

A comprehensive grid of massive binary evolution models for the Galaxy: Surface properties of post-mass-transfer stars

Astronomy & Astrophysics
Context. Massive stars often evolve in binary systems, and the interactions of these systems significantly affect their evolution. Massive stars in the Galaxy serve as valuable test beds for such interactions due to their proximity. Aims. We computed the
Jin Harim, Langer Norbert, Ercolino Andrea, de Mink Selma E.   +3 more
doaj   +1 more source

Atmospheric dynamics of red supergiant stars and applications to Interferometry

, 2007
We have written a 3D radiative transfer code that computes emerging spectra and intensity maps. We derive from radiative hydrodynamic (RHD) simulations of RSG stars carried out with CO5BOLD (Freytag et al. 2002) observables expected for red supergiant stars (RSG) especially for interferometric observations, with emphasis on small scale structures.
Chiavassa, Andréa, Plez, Bertrand, Josselin, E., Freytag, B.   +3 more
openaire   +4 more sources

RED SUPERGIANT STARS AS COSMIC ABUNDANCE PROBES. III. NLTE EFFECTS IN J-BAND MAGNESIUM LINES

, 2015
Non-local thermodynamic equilibrium (NLTE) calculations for Mg i in red supergiant stellar atmospheres are presented to investigate the importance of NLTE for the formation of Mg i lines in the NIR J-band. Recent work using medium resolution spectroscopy
Bergemann, M, Kudritzki, R-P, Kudritzki, Rolf-Peter, Davies, Ben, Bergemann, Maria, Plez, Bertrand, Gazak, Zach, Plez, B, Gazak, Z, Davies, B   +9 more
core   +1 more source