Unified NRP-Modelling of Be Stars
نویسندگان
چکیده
منابع مشابه
Ae / Be Stars
We present high spectral-resolution optical spectra of 49 Herbig Ae/Be stars in a search for the [O i] 6300.2 ˚ A line. The vast majority of the stars in our sample show narrow (FWHM < 100 km s −1) emission lines, centered on the stellar radial velocity. Some stars in our sample show double-peaked lines profiles, with peak-to-peak separations of ∼ 10 km s −1. The presence and strength of the [O...
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We present linear relations between the equivalent widths of the Balmer lines of Be stars and the anomalies in the uvby photometric indices produced by continuum circumstellar emission. A similar relation exists when the emission in the Hβ line is measured through the photometric β index. These relations have been used to elaborate an empirical calibration of the uvbyβ photometric system to det...
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Rotating deformed neutron stars are important potential sources for groundbased gravitational-wave interferometers such as LIGO, GE0600 and VIRGO. One mechanism that may lead to significant non-asymmetries is the internal magnetic field. It is well known that a magnetic star will not be spherical and, if the magnetic axis is not aligned with the spin axis, the deformation will lead to the emiss...
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We present a study of the incidence of Be stars in open clusters as a function of the cluster age, using whenever possible ages determined through Strömgren uvby photometry. For the first time in studies of this kind we have considered separately classical and Herbig Be stars. The main results can be summarized as follows: – Clusters associated to emitting nebulosities and undergoing stellar fo...
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Strömgren differential uvby photometry of λEri and HR2142 is analyzed. The data were taken during the time interval 1983–1994 in the framework of the Long-Term Photometry of Variables project at La Silla. λ Eri exhibited four photometric events (probably associatedwith line emission episodes) that last several months and which were characterized by a common pattern of change in all passbands (∼...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 2002
ISSN: 0252-9211
DOI: 10.1017/s0252921100016134