Results 91 to 100 of about 12,394 (217)

The Blue Supergiant Problem and the Main-Sequence Width

Galaxies
Using Gaia DR3 we derive new distances and luminosities for a sample of Galactic B supergiants which were thought to be post main-sequence (MS) objects from their HR diagram location beyond the terminal-age MS (TAMS).
Jorick S. Vink, Rene D. Oudmaijer
doaj   +1 more source

CONTEMPORARY PROBLEMS OF ASTRONOMY: THE CHEMICAL COMPOSITION OF CEPHEIDS AND RELATED STARS

Odessa Astronomical Publications, 2017
In the short form we present the main results of spectroscopic analysis of the different kind of Cepheids and related stars: double-mode Cepheids, s-Cepheids, non-variable supergiants situated inside the Cepheids instability strip and Cepheids first time
S. M. Andrievsky, V. G. Klochkova
doaj   +1 more source

Understanding B-type Supergiants in the Low Metallicity Environment of the SMC

, 2003
Spectroscopic analyses of 7 SMC B-type supergiants and 1 giant have been undertaken using high resolution optical data obtained on the VLT with UVES. FASTWIND, a non-LTE, spherical,line-blanketed model atmosphere code was used to derive atmospheric and ...
Abbott, Azzopardi, Becker, Becker, Becker, Bresolin, Bresolin, Bresolin, C. Trundle, Castor, Crowther, D. J. Lennon, de Mello, Denissenkov, Dufton, Eber, Eggenberger, Fitzpatrick, Fitzpatrick, Garmany, Gies, Hamann, Harries, Haser, Haser, Heger, Herrero, Herrero, Hillier, Hillier, Howarth, Howarth, Hubeny, J. Puls, Kamp, Kilian, Kudritzki, Kudritzki, Kudritzki, Kudritzki, Kudritzki, Kudritzki, Kurt, Lamers, Lamers, Langer, Leitherer, Leitherer, Lennon, Lennon, Lennon, Lennon, Lennon, Maeder, Maeder, Martins, Massa, Massey, Matthews, McErlean, McErlean, Mihalas, Monteverde, Monteverde, Monteverde, Monteverde, Osmer, Osmer, P. L. Dufton, Pauldrach, Pettini, Prinja, Przybylski, Przybylski, Puls, Puls, Rolleston, Rucinski, Ryans, Sanduleak, Santolaya-Rey, Schaller, Smartt, Talon, Trundle, Urbaneja, Venn, Venn, Venn, Venn, Venn, Vink, Voels, Vrancken, Walborn, Walborn, Wellstein, Wolf, Wolf   +98 more
core   +1 more source

SPECTRAL TYPE AND RADIAL VELOCITY VARIATIONS IN THREE SRC VARIABLES

Odessa Astronomical Publications, 2010
SRC variables are M supergiants, precursors to Type II supernovae, that vary in brightness with moderately regular periods of order 100–1000 days. Although identified as pulsating stars that obey their own period-luminosity relation, few have been ...
K. E. Moncrieff, D. G. Turner, C. I. Short, P. D. Bennett, D. D. Balam, R. F. Griffin   +5 more
doaj   +1 more source

Mid-infrared observations of the SGR 1900+14 error box

, 2002
We report on mid-infrared observations of the compact stellar cluster located in the proximity of SGR 1900+14, and the radio/X-ray position of this soft-gamma repeater.
Bacmann, A., Hartmann, D. H., Henden, A. A., Klose, S., Stecklum, B., Vrba, F. J.   +5 more
core   +2 more sources

High-luminosity G supergiants

The Astrophysical Journal, 1971
High luminosity G supergiants at 0.4-18 micron wavelengths showing intense silicate emission ...
R. M. Humphreys, D. W. Strecker, E. P. Ney   +2 more
openaire   +1 more source

Circumstellar dust as a solution to the red supergiant supernova progenitor problem

, 2011
We investigate the red supergiant problem: the apparent dearth of Type IIP supernova progenitors with masses between 16 and 30 M_sun. Although red supergiants with masses in this range have been observed, none have been identified as progenitors in pre ...
Böhm-Vitense, Cardelli, Crowther, Danchi, de Jager, Dessart, Eggleton, Eldridge, Eldridge, Eldridge, Eldridge, Eldridge, Elias-Rosa, Filippenko, Fraser, Fraser, Heger, John J. Eldridge, Joseph J. Walmswell, Kotak, Levesque, Levesque, Li, Massey, Massey, Massey, Mattila, Maund, Mauron, Press, Schrader, Smartt, Smartt, Smith, Stancliffe, Utrobin, Utrobin, Utrobin, van Loon, Vink, Weidemann, Westera, Whittet, Williams, Woitke, Yoon   +45 more
core   +1 more source

Fast & slow winds from supergiants and Luminous Blue Variables

, 2018
We predict quantitative mass-loss rates and terminal wind velocities for early-type supergiants and luminous blue variables (LBVs) using a dynamical version of the Monte Carlo radiative transfer method.
Vink, Jorick S.
core   +1 more source

Boil-off of red supergiants: mass loss and type II-P supernovae

The Open Journal of Astrophysics
The mass loss mechanism of red supergiant stars is not well understood, even though it has crucial consequences for their stellar evolution and the appearance of supernovae that occur upon core-collapse.
Jim Fuller, Daichi Tsuna
doaj   +1 more source

Red and Yellow Hypergiants

Galaxies
The red and yellow hypergiants are a rare and important phase in the evolution of the most massive stars that can reach the cool part of the HR Diagram.
Terry Jones
doaj   +1 more source