Results 11 to 20 of about 12,394 (217)

A Census of B[e] Supergiants

Galaxies, 2019
Stellar evolution theory is most uncertain for massive stars. For reliable predictions of the evolution of massive stars and their final fate, solid constraints on the physical parameters, and their changes along the evolution and in different ...
Michaela Kraus
exaly   +3 more sources

Dusty Blue Supergiants: News from High-Angular Resolution Observations

Advances in Astronomy, 2014
An overview is presented of the recent advances in understanding the B[e] phenomenon among blue supergiant stars in light of high-angular resolution observations and with an emphasis on the results obtained by means of long baseline optical stellar ...
W. J. de Wit, R. D. Oudmaijer, J. S. Vink   +2 more
doaj   +3 more sources

A supergiants [PDF]

Proceedings of the International Astronomical Union, 2004
A-type supergiants are primary targets for quantitative spectroscopy of individual stars in nearby galaxies because of their intrinsic brightness. An overview is given on the non-LTE techniques required for their analysis. Applications concentrate on placing observational constraints on evolutionary models for massive stars and their host galaxies by ...
Przybilla, N., Bresolin, F., Butler, K., Kaufer, A., Kudritzki, R. P., Venn, K. A.   +5 more
openaire   +2 more sources

Extragalactic Supergiants [PDF]

Proceedings of the International Astronomical Union, 2016
AbstractBlue supergiant stars of B and A spectral types are amongst the visually brightest non-transient astronomical objects. Their intrinsic brightness makes it possible to obtain high quality optical spectra of these objects in distant galaxies, enabling the study not only of these stars in different environments, but also to use them as tools to ...
Urbaneja, M. A., Kudritzki, R. P.
openaire   +2 more sources

Physical Properties of 5000 Cool Large Magellanic Cloud Supergiants with Gaia XP Spectra: A Detailed Portrait of the Upper H-R Diagram Hints at Missing Supernova Progenitors

The Astrophysical Journal, 2023
Characterizing the physical properties of cool supergiants allows us to probe the final stages of a massive star’s evolution before it undergoes core collapse. Despite their importance, the fundamental properties of these stars— $\mathrm{log}{T}_{\mathrm{
Trevor Z. Dorn-Wallenstein, Kathryn F. Neugent, Emily M. Levesque   +2 more
doaj   +1 more source

THE TEMPERATURES OF RED SUPERGIANTS [PDF]

The Astrophysical Journal, 2013
We present a re-appraisal of the temperatures of Red Supergiants (RSGs) using their optical and near-infrared spectral energy distributions (SEDs). We have obtained data of a sample of RSGs in the Magellanic Clouds using VLT+XSHOOTER, and we fit MARCS model atmospheres to different regions of the spectra, deriving effective temperatures for each star ...
Davies, Ben, Kudritzki, Rolf-Peter, Plez, Bertrand, Trager, Scott, Lancon, Ariane, Gazak, Zach, Bergemann, Maria, Evans, Chris, Chiavassa, Andrea   +8 more
openaire   +6 more sources

Endoscopic resection of supergiant pituitary adenoma [PDF]

Surgical Neurology International, 2021
Background: Giant pituitary adenomas are a rare finding and the literature is inconclusive regarding the most appropriate approach. In supergiant adenomas, where the size of the tumor is exceptional, both a combine approach versus a solely transcranial or endoscopic approach have been reported.[2,3,5] Case Description: In this video, an entirely ...
Penner, Federica, Di Perna, Giuseppe, Baldassarre, Bianca Maria, Garbossa, Diego, Zenga, Francesco   +4 more
openaire   +2 more sources

Statistical properties of a sample of periodically variable B-type supergiants - Evidence for opacity-driven gravity-mode oscillations [PDF]

, 2006
We have studied a sample of 28 periodically variable B-type supergiants selected from the HIPPARCOS mission and 12 comparison stars covering the whole B-type spectral range.
Abt, Aerts, Aerts, Aerts, Balona, Belikov, Bianchi, Bosch, Bresolin, Burki, Burki, C. Aerts, Crowther, Daflon, Eggen, Evans, Evans, Fabbian, Fullerton, Georgelin, Gies, Glatzel, Glatzel, Gray, Gray, Grevesse, Gummersbach, Herrero, Hillenbrand, Hillier, Howarth, Hubeny, J. Puls, K. Lefever, Kaufer, Kaufer, Kaufer, Kilian, Kilian, Kubát, Kudritzki, Kudritzki, Lamers, Lamers, Lamers, Lennon, Lovy, Lyubimkov, Marchenko, Markova, Markova, Martins, Massey, Massey, Mathias, Maíz-Apellániz, McErlean, McErlean, Michaud, Mokiem, Mokiem, Morel, Najarro, Pamyatnykh, Pauldrach, Paunzen, Piters, Prinja, Prinja, Prinja, Prinja, Przybilla, Puls, Puls, Puls, Repolust, Repolust, Rivinius, Rolleston, Ryans, Saio, Santolaya-Rey, Scargle, Simón-Díaz, Slowik, Solano, Stellingwerf, Sterken, Sterken, Trundle, Urbaneja, van Genderen, van Genderen, van Genderen, van Leeuwen, Vink, Waelkens, Walborn, Zsargó   +98 more
core   +7 more sources

Impact of Giant Iceberg A68A on the Physical Conditions of the Surface South Atlantic, Derived Using Remote Sensing

Geophysical Research Letters, Volume 50, Issue 18, 28 September 2023., 2023
Abstract Giant icebergs release cold, fresh meltwater as they drift, perturbing the physical conditions of the surface ocean. This study uses satellite‐derived sea surface salinity and temperature measurements to explore the physical impact of supergiant iceberg A68A between September 2020 and June 2021.
R. M. Smith, G. R. Bigg
wiley   +1 more source

Evolution and the period-luminosity relation for red supergiants in the Magellanic Clouds [PDF]

, 2013
Excitation of radial pulsations in red supergiants of Magellanic Clouds is investigated using the stellar evolution calculations and the self-consistent solution of the equations of radiation hydrodynamics and turbulent convection. The stars with initial
Fadeyev, Yuri A.
core   +1 more source