Results 41 to 50 of about 12,394 (217)

Testing the effects of opacity and the chemical mixture on the excitation of pulsations in B stars of the Magellanic Clouds [PDF]

, 2012
The B-type pulsators known as \beta Cephei and Slowly Pulsating B (SPB) stars present pulsations driven by the \kappa mechanism, which operates thanks to an opacity bump due to the iron group elements.
A. Miglio, A. Noels, Aerts, Andrievsky, Angulo, Asplund, Asplund, Ausseloos, Badnell, Bahcall, Baker, Briquet, Buchler, Böhm-Vitense, Carrera, Cox, Cox, Daszyńska-Daszkiewicz, Daszyńska-Daszkiewicz, De Propris, Desmet, Diago, Dupret, Dupret, Dziembowski, Dziembowski, Dziembowski, Esteban, Formicola, Garnett, Gilles, Gonzalez, Grevesse, Hill, Hill, Hill, Hunter, Hunter, Hunter, Idiart, Iglesias, J. Montalbán, Jeffery, Karoff, Korn, Korn, Korn, Kołaczkowski, Kurt, Lebouteiller, Lennon, Loisel, Luck, M.-A. Dupret, Mazumdar, Miglio, Miglio, Montalbán, Montalbán, Montalbán, Moskalik, Pamyatnykh, Pamyatnykh, Pamyatnykh, Parisi, Parisi, Peimbert, Piatti, Piatti, Reyes, Rogers, Rogers, Rolleston, Rolleston, Romaniello, Russell, S. Salmon, Sarro, Scuflaire, Seaton, Seaton, Simon, Stankov, T. Morel, Thoul, Trundle, Turck-Chièze, Unno, Venn, Venn, Vermeij, Waelkens, Zdravkov   +92 more
core   +1 more source

Supergiant pulses from extragalactic neutron stars [PDF]

Monthly Notices of the Royal Astronomical Society, 2016
We consider radio bursts that originate from extragalactic neutron stars (NSs) by addressing three questions about source distances. What are the physical limitations on coherent radiation at GHz frequencies? Do they permit detection at cosmological distances? How many bursts per NS are needed to produce the inferred burst rate $\sim 10^3$-$10^4 $sky$^{
Cordes, J. M., Wasserman, Ira
openaire   +2 more sources

A constant upper luminosity limit of cool supergiant stars down to the extremely low metallicity of I Zw 18

Astronomy & Astrophysics
Stellar wind mass loss of massive stars is often assumed to depend on their metallicity Z. Therefore, evolutionary models predict that massive stars in lower-Z environments are able to retain more of their hydrogen-rich layers and evolve into brighter ...
Schootemeijer Abel, Götberg Ylva, Langer Norbert, Bortolini Giacomo, Hirschauer Alec S., Patrick Lee   +5 more
doaj   +1 more source

Characteristics and classification of A-type supergiants in the Small Magellanic Cloud

, 2003
We address the relationship between spectral type and physical properties for A-type supergiants in the SMC. We first construct a self-consistent classification scheme for A supergiants, employing the calcium K to H epsilon line ratio as a temperature ...
Evans, C. J., Howarth, I. D.
core   +2 more sources

Painting a family portrait of the yellow super- and hypergiants in the Milky Way

Astronomy & Astrophysics
Context. The distances to evolved massive stars in the Milky Way are poorly constrained by Gaia parallaxes because these stars are bright and variable.
Kasikov A., Mehner A., Kolka I., Aret A.
doaj   +1 more source

OB-stars as extreme condition test beds [PDF]

, 2010
Massive stars are inherently extreme objects, in terms of radiation, mass loss, rotation, and sometimes also magnetic fields. Concentrating on a (personally biased) subset of processes related to pulsations, rapid rotation and its interplay with mass ...
González, Jorge G. Rivero, Puls, Joachim, Sundqvist, Jon O.   +2 more
core   +1 more source

Supergiant Variables: Recent Observational Results [PDF]

International Astronomical Union Colloquium, 1993
AbstractRecent observations of several types of supergiant variable stars are reviewed: massive blue, yellow and red supergiants; classical and population II Cepheids; RV Tauri stars; yellow semi-regular (SRd) variables, including UU Herculis stars; and R Coronae Borealis stars.
openaire   +1 more source

Yellow Supergiants in the Small Magellanic Cloud (SMC): Putting Current Evolutionary Theory to the Test

, 2010
The yellow supergiant content of nearby galaxies provides a critical test of massive star evolutionary theory. While these stars are the brightest in a galaxy, they are difficult to identify because a large number of foreground Milky Way stars have ...
Ardeberg, Azzopardi, Azzopardi, Bouchet, Brian Skiff, Cannon, Carpenter, Drout, Feast, Feast, Florsch, Fullerton, Georges Meynet, Houk, Humphreys, Josselin, Kathryn F. Neugent, Kippenhahn, Knut A. G. Olsen, Kurucz, Leitherer, Lennon, Levesque, Lü, Maeder, Maria R. Drout, Massey, Massey, Massey, Massey, Massey, Nieuwenhuijzen, Penny, Philip Massey, Przybilla, Przybilla, Puls, Richter, Schlegel, Skrutskie, Stanimirović, van Loon, Vazquez, Zaritsky   +43 more
core   +1 more source

STIS UV spectroscopy of early B supergiants in M31 [PDF]

, 2002
We analyze STIS spectra in the 1150-1700 Angstrom wavelength range obtained for six early B supergiants in the neighboring galaxy M31. Because of their likely high (nearly solar) abundance, these stars were originally chosen to be directly comparable to ...
Artemio Herrero, Bajaja E., Bianchi L., Bianchi L., Daniel J. Lennon, Fabio Bresolin, Groenewegen M. A. T., Hamann W.-R., Haser S. M., Herrero A., Howarth I. D., Joachim Puls, Kudritzki R. P., Miguel A. Urbaneja, Puls J., Rolf‐Peter Kudritzki, Rolleston W. R. J., Stephen J. Smartt, van den Bergh S.   +18 more
core   +2 more sources

Betelgeuse and the Red Supergiants [PDF]

EAS Publications Series, 2013
Summary talk of the Betelgeuse workshop, November 2012, Paris. To be published in the European Astronomical Society Publications Series, editors: Pierre Kervella, Thibaut Le Bertre & Guy ...
openaire   +2 more sources