منابع مشابه
Absolute spectrophotometry of northern compact planetary nebulae ⋆
We present medium-dispersion spectra and narrowband images of six northern compact planetary nebulae (PNe): BoBn 1, DdDm 1, IC 5117, M 1-5, M 1-71, and NGC 6833. From broad-slit spectra, total absolute fluxes and equivalent widths were measured for all observable emission lines. High signal-to-noise emission line fluxes of Hα, Hβ, [Oiii], [Nii], and HeI may serve as emission line flux standards...
متن کاملUltraviolet Spectrophotometry of Variable Early-Type Be and B stars Derived from High-Resolution IUE Data
High-dispersion IUE data encode significant information about aggregate line absorptions that cannot be conveniently extracted from individual stellar spectra. Herein we apply a new technique in which fluxes from each echelle order of a short-wavelength IUE spectrum are binned together to construct low-resolution spectra of a rapidly varying B or Be star. The division of binned spectra obtained...
متن کاملNicmos Spectrophotometry and Models for A–stars
Absolute flux distributions for eight stars are well measured from 0.8–2.5 μm with NICMOS grism spectrophotometry at a resolution of R ∼ 100 and an accuracy of 1–2%. These SEDs are fit with Castelli & Kurucz model atmospheres; and the results are compared with the Cohen-Walker-Witteborn (CWW) template models for the same stars. In some cases, the Teff , log g, and log z parameters of the best f...
متن کاملAbsolute magnitudes and kinematics of barium stars
The absolute magnitude of barium stars has been obtained from kinematical data using a new algorithm based on the maximum-likelihood principle. The method allows to separate a sample into groups characterized by different mean absolute magnitudes, kinematics and z-scale heights. It also takes into account, simultaneously, the censorship in the sample and the errors on the observables. The metho...
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...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1987
ISSN: 0252-9211
DOI: 10.1017/s0252921100116252