Results 71 to 80 of about 3,913,690 (210)
P Cygni Stars as an Intermediate Stage Between Red Supergiants and Wolf-Rayet Stars [PDF]
Symposium - International Astronomical Union, 1984 P Cygni's evolutionary status is evaluated using its recently redetermined basic parameters (Lamers et al. 1983) to plot the star on the HRD (Figure 1). The theoretical evolutionary track of a 60 M⊙ star passes through P Cygni's error box twice. From a comparison of the time scales along the two parts of the track it is found to be twenty times more ...
Henny J.G.L.M. Lamers +2 more
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Red Supergiant Stars as Cosmic Abundance Probes: NLTE Effects in J-band Iron and Titanium Lines
, 2012 37 pages, 10 figures, accepted for publication in ApJInternational audienceDetailed non-LTE calculations for red supergiant stars are presented to investigate the influence of NLTE on the formation of atomic iron and titanium lines in the J-band.
Bergemann, M. +11 more
core +1 more source
Discovery of Weak CN Stars in the Large Magellanic Cloud and Comparison to Stellar Models
The Astrophysical JournalThe recent discovery that red supergiants in M31 and M33 contain a weak CN spectral absorption feature at ∼8000 Å prompted us to analyze a large CTIO 4 m Hydra spectral database of stars in the Large Magellanic Cloud (LMC).
Douglas Grion Filho +6 more
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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 +2 more
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The Astrophysical JournalWe present a comprehensive analysis of 32 type II supernovae (SNe II) with plateau phase photometry and late phase ( nebular ) spectroscopy available, aiming to bridge the gap between the surface and core of their red supergiant (RSG) progenitors.
Qiliang Fang +4 more
doaj +1 more source
Red Supergiant Problem Viewed from the Nebular Phase Spectroscopy of Type II Supernovae
The Astrophysical JournalThe red supergiant (RSG) problem refers to the observed dearth of luminous RSGs identified as progenitors of Type II supernovae (SNe II) in pre-SN imaging.
Qiliang Fang +2 more
doaj +1 more source
The Stellar Content of the Young Open Cluster Berkeley 50 (IC 1310)
The Astronomical JournalWe observed the Galactic open cluster Berkeley 50 in order to determine its stellar content, distance, and age. We obtained UBV photometry of 1145 stars in a 12.′3 × 12.′3 field, and used Gaia proper motions and parallaxes to identify 64 members, of ...
Meghan Speckert +2 more
doaj +1 more source
THE PHYSICAL PROPERTIES OF THE RED SUPERGIANT WOH G64: THE LARGEST STAR KNOWN? [PDF]
The Astronomical Journal, 2009 WOH G64 is an unusual red supergiant (RSG) in the Large Magellanic Cloud (LMC), with a number of properties that set it apart from the rest of the LMC RSG population, including a thick circumstellar dust torus, an unusually late spectral type, maser activity, and nebular emission lines.
Levesque, Emily M. +3 more
openaire +2 more sources
Astronomy & AstrophysicsContext. Mass loss in evolved massive stars plays a critical role in shaping their circumstellar environments and enriching the interstellar medium. In binary systems, stellar interactions can further complicate this process, affecting stellar evolution,
Tomassini G. +8 more
doaj +1 more source
An Accurate Mass of the 31 Cygni Red Supergiant
, 2018 Red supergiants are massive, evolved stars that are among the brightest stars in the near infrared. But the uncertain physics of mass loss limits the ability of evolutionary models to accurately represent these stars in detail.
Ayres, Thomas R. +5 more
core +1 more source