منابع مشابه
Two new bright Ae stars ⋆
Two newly identified Ae stars, ν Cyg and κ UMa, were discovered in the course of the Magnetic Survey of Bright MS stars (Monin et al. 2002). We present their Hα profiles along with measurements of their equivalent width and parameters of emission features. Emission in the Hα line of ν Cyg is variable on a time scale of 3 years. κ UMa exhibits weak emission which is rather stable. The emission i...
متن کاملAe / 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...
متن کاملBinaries among Herbig Ae/Be stars
We have studied the circumstellar environment of 31 Herbig Ae/Be and related stars in the near infrared by means of speckle-interferometry. For the brighter objects we reach or approximate diffraction-limited resolution of ≈ 0.1′′ (typically 100 AU at the object). Of the resolved objects some show halos, some have a companion. Here we restrict ourselves to a discussion of binarity in this sampl...
متن کاملAccretion Rates in Herbig Ae stars
Accretion rates from disks around pre-main sequence stars are of importance for our understanding of planetary formation and disk evolution. We provide in this paper estimates of the mass accretion rates in the disks around a large sample of Herbig Ae stars. We obtained medium resolution 2 μm spectra and used the results to compute values of Ṁacc from the measured luminosity of the Brγ emission...
متن کاملMagnetic fields of Herbig Ae/Be stars
We report on the status of our spectropolarimetric studies of Herbig Ae/Be stars carried out during the last years. The magnetic field geometries of these stars, investigated with spectropolarimetric time series, can likely be described by centred dipoles with polar magnetic field strengths of several hundred Gauss. A number of Herbig Ae/Be stars with detected magnetic fields have recently been...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2003
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20031182