منابع مشابه
TOWARD 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 nature of FS CMa stars as revealed by host young clusters
The nature and evolutionary state of the diverse objects displaying the B[e] phenomenon are reasonably known, except for a rare subtype named FS CMa stars. These are surrounded by compact disks of warm dust whose origin is unclear. Although the luminosity of these objects corresponds to main-sequence stars, mass loss rates derived from emission lines are 2 orders of magnitude larger than predic...
متن کاملDynamical Tide in Solar-Type Binaries
Circularization of late-type main-sequence binaries is usually attributed to turbulent convection, while that of early-type binaries is explained by resonant excitation of g modes. We show that the latter mechanism operates in solar-type stars also and is at least as effective as convection, despite inefficient damping of g modes in the radiative core. The maximum period at which this mechanism...
متن کاملEvolutionary status of late-type contact binaries
An abstract should be given A new scenario for evolution of contact binaries is presented and discussed. Arguments are given that W UMa-type systems are formed from detached binaries which lose angular momentum via magnetized wind. This takes typically several Gyr. Such an age is sufficient for the initially more massive component to deplete hydrogen in its core and to fill the Roche lobe. As a...
متن کاملبررسی ارزش تشخیصی fs
Frozen section is a useful method in the diagnosis of different malignancies including those of thyroid origin. However, there are still controversies about its application, sensitivity and specificity for thyroid neoplasm. In this study, diagnostic value of frozen section (FS) was compared with permanent histopathologic and Fine Needle Aspiration (FNA). In this study, which was conducted in pr...
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ژورنال
عنوان ژورنال: EAS Publications Series
سال: 2015
ISSN: 1633-4760,1638-1963
DOI: 10.1051/eas/1571040