Results 221 to 230 of about 115,902 (249)
Some of the next articles are maybe not open access.
Publications of the Astronomical Society of the Pacific, 2003
Recent results for classical Be stars are reviewed and links to general astrophysics are presented. Classical Be stars are B-type stars close to the main sequence that exhibit line emission over the photospheric spectrum. The excess is attributed to a circumstellar gaseous component that is commonly accepted to be in the form of an equatorial disk ...
John M. Porter, Thomas Rivinius
openaire +1 more source
Recent results for classical Be stars are reviewed and links to general astrophysics are presented. Classical Be stars are B-type stars close to the main sequence that exhibit line emission over the photospheric spectrum. The excess is attributed to a circumstellar gaseous component that is commonly accepted to be in the form of an equatorial disk ...
John M. Porter, Thomas Rivinius
openaire +1 more source
EAS Publications Series, 2011
This chapter describes non supergiant B-type stars that show emission lines, called Be stars. The emission is caused by the presence of a circumstellar decretion disk. Many physical phenomena are thought to be involved in these stars, such as rapid rotation, pulsations and magnetic fields, and give rise to variations.
openaire +2 more sources
This chapter describes non supergiant B-type stars that show emission lines, called Be stars. The emission is caused by the presence of a circumstellar decretion disk. Many physical phenomena are thought to be involved in these stars, such as rapid rotation, pulsations and magnetic fields, and give rise to variations.
openaire +2 more sources
Astrophysics and Space Science, 1994
Herbig Ae/Be stars are the higher mass counterparts of the T Tauri stars. In comparison with the latter, however, relatively little is known about them. After a historical introduction, we briefly review their optical and UV spectroscopic properties.
openaire +1 more source
Herbig Ae/Be stars are the higher mass counterparts of the T Tauri stars. In comparison with the latter, however, relatively little is known about them. After a historical introduction, we briefly review their optical and UV spectroscopic properties.
openaire +1 more source
A Star Trek About Being Star Trek
2020At the height of the Cold War, the original Star Trek series provided viewers with a utopian, racially inclusive, and altogether progressive alternative to the present standoff among superpowers. Yet, at the same time, it was caught within the Cold War world system. Star Trek may have interrogated U.S.
openaire +1 more source
1987
In order to discuss the impact of IUE observations on studies of Be star phenomena, we must first address the question of what a Be star is. The fact that this is required says something significant about the field: Be stars represent an assortment of complex phenomena for which there is still no comprehensive theoretical understanding.
Theodore P. Snow, Roberto Stalio
openaire +1 more source
In order to discuss the impact of IUE observations on studies of Be star phenomena, we must first address the question of what a Be star is. The fact that this is required says something significant about the field: Be stars represent an assortment of complex phenomena for which there is still no comprehensive theoretical understanding.
Theodore P. Snow, Roberto Stalio
openaire +1 more source
Publications of the Astronomical Society of the Pacific, 1983
Intensifier director scanner H-alpha profiles are presented of the bright northern Be stars, which have recently developed significant emission line variability. These stars are candidates for intensive spectroscopic, photometric, and polarimetric observations during the current season.
openaire +1 more source
Intensifier director scanner H-alpha profiles are presented of the bright northern Be stars, which have recently developed significant emission line variability. These stars are candidates for intensive spectroscopic, photometric, and polarimetric observations during the current season.
openaire +1 more source
Space Science Reviews, 1979
‘Classical’ Be stars are defined and their relationship to normal B-type stars stated. Spectral classification of the underlying stars suggests that, on the average, Be stars are located 0.5–1.0 magnitude above the main sequence. Struve's rotational model for Be stars, and several tests which support the model, are reviewed.
openaire +1 more source
‘Classical’ Be stars are defined and their relationship to normal B-type stars stated. Spectral classification of the underlying stars suggests that, on the average, Be stars are located 0.5–1.0 magnitude above the main sequence. Struve's rotational model for Be stars, and several tests which support the model, are reviewed.
openaire +1 more source
British Journal of Healthcare Assistants, 2009
Well here we are, the start of a new era for me, just as 2009 draws to a close. Roll on 2010 and let's hope it's a good year for all of us! With Christmas approaching, it seems fitting to tell you about a bright star that I saw recently.
openaire +1 more source
Well here we are, the start of a new era for me, just as 2009 draws to a close. Roll on 2010 and let's hope it's a good year for all of us! With Christmas approaching, it seems fitting to tell you about a bright star that I saw recently.
openaire +1 more source
Be Stars, Shell Stars, and Of Stars
1966The fact that some stars rotate rapidly was discovered by Schlesinger (1909, 1913) who found a small distortion of the radial-velocity curve during the ingress to and egress from eclipse of the principle components of δ Librae and of λ Tauri. This he interpreted as a rotational effect. This discovery was followed up and consolidated by studies of other
openaire +1 more source
To Be or Not to Be: EHB Stars and AGB Stars
Proceedings of the International Astronomical Union, 2018AbstractThe formation of EHB stars is linked to the lives of AGB stars by indications that such EHB/sdB stars might form in globular clusters with multiple populations linked to AGB evolution. Observations of massive globular clusters, such as ω-Centauri (Bedin et al.2004, Piotto et al.2005) suggest that single EHB stars might form from He-enhanced ...
openaire +1 more source