The evolutionary phase of B[e] supergiants and unclassified B[e] stars
نویسنده
چکیده
We present two classes of stars with yet unknown evolutionary phase: the B[e] supergiants and the so-called unclassified B[e] stars. While the B[e] supergiants are luminous post-main sequence stars with high mass progenitors, not much is known of the unclassified stars. We discuss how it might be possible to determine their evolutionary phases in the area of new large telescopes.
منابع مشابه
B[e] Supergiants: What Is Their Evolutionary Status?
In this paper, we investigate the evolutionary status of B[e] stars from the point of view of stellar evolution theory. We try to answer to the question of how massive hot supergiants — i.e. evolved stars — can be capable of producing a circumstellar disk. We find and discuss three possibilities: very massive evolved main sequence stars close to critical rotation due to their proximity to their...
متن کاملTOWARD UNDERSTANDING THE B[e] PHENOMENON. I. DEFINITION OF THE GALACTIC FS CMa STARS
Q1 The B[e] phenomenon is defined as the simultaneous presence of low-excitation forbidden line emission and strong infrared excess in the spectra of early-type stars. It was discovered in our Galaxy 30 years ago in the course of the early exploration of the infrared sky and initially identified in 65 Galactic objects, of which nearly half remained unclassified. The phenomenon is associated wit...
متن کاملThe Open University ’ s repository of research publications and other research outputs The population of OB supergiants in the starburst
Context. After leaving the main sequence, massive stars undergo complex evolution, which is still poorly understood. With a population of hundreds of OB stars, the starburst cluster Westerlund 1 offers an unparallelled environment to study their evolutionary tracks. Aims. We characterise a large sample of evolved OB stars in the cluster, with the aim of determining cluster parameters and place ...
متن کاملresearch publications and other research outputs The population of OB supergiants in the starburst
Context. After leaving the main sequence, massive stars undergo complex evolution, which is still poorly understood. With a population of hundreds of OB stars, the starburst cluster Westerlund 1 offers an unparallelled environment to study their evolutionary tracks. Aims. We characterise a large sample of evolved OB stars in the cluster, with the aim of determining cluster parameters and place ...
متن کاملCatching the Binaries Amongst B[e] Stars
It is surprising to find dust around B type stars, as in the case of B[e] stars. These stars exhibit a dense, dusty environment witnessed by their infrared-excess and many emission lines from permitted and forbidden transitions. Given the large uncertainties on their distances, this spectral type gathers many different kind of sources that may harbor a similar circumstellar environment, i.e. a ...
متن کامل