Zobrazeno 1 - 10
of 297
pro vyhledávání: '"Humphreys, Roberta"'
Autor:
Humphreys, Roberta M., Richards, A. M. S., Davidson, Kris, Singh, A. P., Decin, L., Ziurys, L. M.
The red hypergiant VY CMa is famous for its very visible record of high mass loss events. Recent CO observations with ALMA revealed three previously unknown large scale outflows (Paper I). In this paper we use the CO maps to investigate the motions o
Externí odkaz:
http://arxiv.org/abs/2401.14467
The empirical evidence for an upper mass limit for the red supergiant (RSG) progenitors of the Type II-P SNe at about 18 Msun, raises questions about the fate of the most luminous, most massive RSGs. These stars may evolve back to warmer temperatures
Externí odkaz:
http://arxiv.org/abs/2306.07336
Publikováno v:
Res. Notes AAS, 7, 96 (2023)
The evolutionary relationships and mechanisms governing the behavior of the wide variety of luminous stars populating the upper H-R diagram are not well established. Luminous blue variables (LBVs) are particularly rare, with only a few dozen identifi
Externí odkaz:
http://arxiv.org/abs/2305.11687
Autor:
Humphreys, Roberta M., Jones, Terry J.
The red hypergiant VY CMa and the more typical red supergiant Betelgeuse provide clear observational evidence for discrete, directed gaseous outflows in their optical and infrared imaging, spectra, and light curves. In the very luminous VY CMa, mass
Externí odkaz:
http://arxiv.org/abs/2201.07818
Publikováno v:
2021RNAAS...5..197M
Hubble Space Telescope photometry of $\eta$ Carinae spans 23 years, including five spectroscopic events. The rapid brightening rate decreased after 2010, and the spectroscopic events in 2014 and 2020 had light curves different from their predecessors
Externí odkaz:
http://arxiv.org/abs/2109.08012
Autor:
Humphreys, Roberta M., Davidson, Kris, Richards, A. M. S., Ziurys, L. M., Jones, Terry J., Ishibashi, Kazunori
Imaging and spectroscopy of the knots, clumps, and extended arcs in the complex ejecta of VY CMa confirm a record of high mass loss events over the past few hundred years. HST/STIS spectroscopy of numerous small knots close to the star allow us to me
Externí odkaz:
http://arxiv.org/abs/2012.08550
How massive stars end their lives remains an open question in the field of star evolution. While the majority of stars above 9 M_sun will become red supergiants (RSGs), the terminal state of these massive stars can be heavily influenced by their mass
Externí odkaz:
http://arxiv.org/abs/2009.05153
Autor:
Humphreys, Roberta M.
Publikováno v:
Galaxies, vol. 7, issue 3, p. 75, 2019
Several decades of observations of the most massive and most luminous stars have revealed a complex upper HR Diagram, shaped by mass loss, and inhabited by a variety of evolved stars exhibiting the consequences of their mass loss histories. This revi
Externí odkaz:
http://arxiv.org/abs/2009.02339
We report mid- to far-infrared imaging and photomety from 7 to 37 microns with SOFIA/FORCAST and 2 micron adaptive optics imaging with LBTI/LMIRCam of a large sample of red supergiants (RSGs) in four Galactic clusters; RSGC1, RSGC2=Stephenson 2, RSGC
Externí odkaz:
http://arxiv.org/abs/2008.01108
Autor:
Humphreys, Roberta M.
Publikováno v:
RNAAS, vol. 3, number 10, 2019
The broad-band colors of the progenitor of the black hole candidate in NGC 6946 suggest that it was a yellow hypergiant on a post-red supergiant track when the core collapse occurred.
Comment: Shorter version published in Research Notes of the A
Comment: Shorter version published in Research Notes of the A
Externí odkaz:
http://arxiv.org/abs/1911.02037