Results 101 to 110 of about 9,582 (206)

A Model for Eruptive Mass Loss in Massive Stars

The Astrophysical Journal
Eruptive mass loss in massive stars is known to occur, but the mechanism(s) are not yet well understood. One proposed physical explanation appeals to opacity-driven super-Eddington luminosities in stellar envelopes.
Shelley J. Cheng, Jared A. Goldberg, Matteo Cantiello, Evan B. Bauer, Mathieu Renzo, Charlie Conroy   +5 more
doaj   +1 more source

The Massive Star Population in M101. I. The Identification and Spatial Distribution of the Visually Luminous Stars

, 2013
An increasing number of non-terminal giant eruptions are being observed by modern supernova and transient surveys. But very little is known about the origin of these giant eruptions and their progenitors, many of which are presumably very massive ...
Grammer, Skyler, Humphreys, Roberta M.
core   +1 more source

Near-IR Spectra of Red Supergiants and Giants. I- Models with Solar and with Mixing-Induced Surface Abundance Ratios

, 2007
We provide a grid of PHOENIX spectra of red giant and supergiant stars, that extend through optical and near-IR wavelengths. For the first time, models are also provided with modified surface abundances of C, N and O, as a step towards accounting for the
A. Lançon, Anders, Baldwin, Beer, Bessell, Bessell, Bessell, Boothroyd, Bressan, Cardelli, Charbonnel, Charbonnel, D. Ladjal, Decin, do Nascimento, Frogel, Girardi, Goorvitch, Goorvitch, Iben, Iben, Iben, Keenan, Kucinskas, Kucinskas, Lançon, Levesque, Levesque, Loidl, M. Mouhcine, Maeder, Maeder, Martins, McGregor, McWilliam, Meynet, Meynet, Meynet, Origlia, Origlia, P. H. Hauschildt, Schaller, Smith, Trundle, Tsuji, van Belle, Vanhollebeke, White, Wing   +48 more
core   +1 more source

Nitrogen Enrichment in Atmospheres of A- and F- Type Supergiants

, 2010
Using new accurate fundamental parameters of 30 Galactic A and F supergiants, namely their effective temperatures Teff and surface gravities log g, we implemented a non-LTE analysis of the nitrogen abundance in their atmospheres. It is shown that the non-
Allen, Asplund, Bernacca, Caffau, Carlsson, Castelli, Castelli, Claret, Cunha, Cunto, Cunto, David L. Lambert, Dmitry B. Poklad, El Eid, Eriksson, Frost, Fukuda, García-Rojas, Gies, Gray, Heger, Heiter, Hirata, Hunter, Kilian, Kilian, Kippenhahn, Korotin, Kupka, Kurucz, Lamers, Leonid S. Lyubimkov, Luck, Luck, Lyubimkov, Lyubimkov, Lyubimkov, Lyubimkov, Maeder, Maiorca, Morel, Przybilla, Przybilla, Przybilla, Przybilla, Przybilla, Schiller, Seaton, Sergey A. Korotin, Sergey I. Rostopchin, Smiljanic, Steenbock, Summers, Takeda, Takeda, Tamara M. Rachkovskaya, Tsymbal, Van Leeuwen, Van Regemorter, Venn, Venn, Verdugo   +61 more
core   +1 more source

Multiwavelength Signatures of Supernova Shock Breakout from Red Supergiants in Two Dimensions

The Astrophysical Journal
We present new two-dimensional radiation hydrodynamic simulations of supernova shock breakout from red supergiants (RSGs) using the CASTRO code. Our progenitors are 20 and 25 M _⊙ solar-metallicity stars evolved from the zero-age main sequence with MESA ...
Wun-Yi Chen, Ke-Jung Chen, Keiichi Maeda, Masaomi Ono, Po-Sheng Ou, Friedrich K. Röpke   +5 more
doaj   +1 more source

History of two mass loss processes in VY CMa. [PDF]

Proc Int Astron Union, 2023
Quintana-Lacaci G, Velilla L, Fonfría JP, Cernicharo J, Castro-Carrizo A, Agúndez M, Decin L.   +6 more
europepmc   +1 more source

Physical Properties of Red Supergiants

, 2007
Red supergiants (RSGs) are an evolved stage in the life of intermediate massive stars (<25Mo). For many years their location in the H-R diagram was at variance with the evolutionary models. Using the MARCS stellar atmosphere models, we have determined new effective temperatures and bolometric luminosities for RSGs in the Milky Way, LMC, and SMC, and
Massey, Philip, Plez, Bertrand, Levesque, Emily M., Olsen, K. A. G., Silva, David R., Clayton, Geoffery C.   +5 more
openaire   +2 more sources

Binary Yellow Supergiants in the Magellanic Clouds. I. Photometric Candidate Identification

The Astrophysical Journal
Recent works have constrained the binary fraction of evolved populations of massive stars in local galaxies such as red supergiants and Wolf–Rayet stars, but the binary fraction of yellow supergiants (YSGs) in the Hertzsprung gap remains unconstrained ...
Anna J. G. O’Grady, Maria R. Drout, Kathryn F. Neugent, Bethany Ludwig, Ylva Götberg, B. M. Gaensler   +5 more
doaj   +1 more source

Near-Infrared spectroscopy of the super star cluster in NGC1705

, 2012
We study the near-infrared properties of the super star cluster NGC1750-1 in order to constrain its spatial extent, its stellar population and its age. We use adaptive optics assisted integral field spectroscopy with SINFONI on the VLT.
Eisenhauer, F., Lutz, D., Martins, F., Schreiber, N. M. Foerster   +3 more
core   +1 more source

The Red Supergiant Problem: As Seen from the Local Group's Red Supergiant Populations

11 pages, 7 Figures, 3 Tables.
Healy, Sarah, Horiuchi, Shunsaku, Ashall, Chris   +2 more
openaire   +2 more sources