Results 31 to 40 of about 11,425 (209)

On the Explosion Geometry of Red Supergiant Stars [PDF]

Proceedings of the International Astronomical Union, 2015
AbstractWe present the observed “continuum” levels of polarization as a function of time for four well-observed Type II-Plateau supernovae (SNe II-P; Fig. 1), the class of SNe decisively determined to arise from red supergiant stars (Smartt 2009). All four objects show temporally increasing degrees of polarization through the end of the photospheric ...
Douglas C. Leonard, Luc Dessart, Giuliano Pignata, D. John Hillier, George G. Williams, Paul S. Smith, Harish Khandrika, Christopher Bilinski, Nhieu Duong, Kelsi Flatland, Luis Gonzalez, Jennifer L. Hoffman, Chuck Horst, Leah Huk, Peter Milne, Alisa A. Rachubo, Nathan Smith   +16 more
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Possible Detection of the Progenitor of the Type II Supernova SN 2023ixf

The Astrophysical Journal Letters, 2023
Stellar evolution theory predicts multiple pathways to the explosive deaths of stars as supernovae. Locating and characterizing the progenitors of well-studied supernovae is important to constrain the theory and to justify and design future surveys to ...
Joanne L Pledger, Michael M Shara
doaj   +1 more source

The puzzle of the CNO abundances of {\alpha} Cygni variables resolved by the Ledoux criterion? [PDF]

, 2013
Recent stellar evolution computations show that the blue supergiant (BSG) stars could come from two distinct populations: a first group arising from massive stars that just left the main sequence (MS) and are crossing the Hertzsprung-Russell diagram (HRD)
Georgy, Cyril, Meynet, Georges, Saio, Hideyuki   +2 more
core   +1 more source

Search for Supernova Progenitor Stars with ZTF and LSST

The Astrophysical Journal, 2023
The direct detection of core-collapse supernova (SN) progenitor stars is a powerful way of probing the last stages of stellar evolution. However, detections in archival Hubble Space Telescope images are limited to about one detection per year.
Nora L. Strotjohann, Eran O. Ofek, Avishay Gal-Yam, Jesper Sollerman, Ping Chen, Ofer Yaron, Barak Zackay, Nabeel Rehemtulla, Phillipe Gris, Frank J. Masci, Ben Rusholme, Josiah Purdum   +11 more
doaj   +1 more source

Tomography of cool giant and supergiant star atmospheres [PDF]

Astronomy & Astrophysics, 2019
Context. Red supergiants are cool massive stars and are the largest and the most luminous stars in the Universe. They are characterized by irregular or semi-regular photometric variations, the physics of which is not clearly understood. Aims. The paper aims to derive the velocity field in the red supergiant star μ Cep and to relate it to the ...
Kravchenko, K., Chiavassa, A., van Eck, S., Jorissen, A., Merle, T., Freytag, B., Plez, Bertrand   +6 more
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Combining observational techniques to constrain convection in evolved massive star models [PDF]

, 2014
Recent stellar evolution computations indicate that massive stars in the range ~ 20 - 30 Msun are located in the blue supergiant (BSG) region of the Hertzsprung-Russell diagram at two different stages of their life: immediately after the main sequence ...
Georgy, C., Meynet, G., Saio, H.
core   +2 more sources

Far infrared circumstellar “Debris” shells of red supergiant stars

The Astronomical Journal, 1988
Examination of IRAS data on late type evolved stars suggests that there is yet another transition line, between chromospheres and dust, which lies above and to the right of corona-wind transitions in the HR Diagram. The IRAS 60 µm data also appears to indicate the existence of very cool material extending tens of thousands of stellar radii around red ...
Robert E. Stencel, Joseph E. Pesce, Wendy Hagen Bauer   +2 more
openaire   +1 more source

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
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Infrared properties of Active OB stars in the Magellanic Clouds from the Spitzer SAGE Survey [PDF]

, 2010
We present a study of the infrared properties of 4922 spectroscopically confirmed massive stars in the Large and Small Magellanic Clouds, focusing on the active OB star population.
Bonanos, A. Z., Evans, C. J., Gordon, K., Köhlinger, F., Lennon, D. J., Massa, D. L., Meixner, M., Panagia, N., Sewilo, M., Smith, L. J., teams, the SAGE, van Loon, J. Th.   +11 more
core   +3 more sources

Yellow Hypergiants as Dynamically Unstable Post–Red Supergiant Stars [PDF]

The Astrophysical Journal, 2001
According to recent theoretical studies, the majority of single stars more massive than 30 solar mass successfully evolve into red supergiants, but then lose most of their hydrogen envelopes and metamorphose into hot blue remnants. While they are cool, they become dynamically unstable as a result of high radiation pressure and partial ionization of the
Richard B. Stothers, Chao‐wen Chin
openaire   +1 more source