منابع مشابه
Nicmos 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 کاملTwo 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 کاملBright OB stars in the Galaxy
In this study we investigate the line-profile variability (lpv) of Hα for a large sample of O-type supergiants (15 objects between O4 and O9.7), in an objective, statistically rigorous manner. We employed the Temporal Variance Spectrum (TVS) analysis, developed by Fullerton, Gies & Bolton (1996) for the case of photospheric absorption lines and modified by us to take into account the effects of...
متن کاملRadio Sources near Bright Natural Guide Stars
We present a preliminary survey of 58 radio sources within the isoplanatic patches (r < 25′′) of bright (11 < R < 12) stars suitable for use as natural guide stars with high-order adaptive optics (AO). An optical and near-infrared imaging survey was conducted utilizing tip-tilt corrections in the optical and AO in the near-infrared. Spectral Energy Distributions (SEDs) were fit to the multiband...
متن کاملHot UV bright stars in globular clusters
We have obtained medium-resolution spectra of seven UV-bright stars discovered on images of four southern globular clusters obtained with the Ultraviolet Imaging Telescope (UIT). Effective temperatures, surface gravities and helium abundances are derived from LTE and non-LTE model atmosphere fits. Three of the stars have sdO spectra, including M4Y453 (Teff = 58800 K, log g = 5.15), NGC 6723-III...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1981
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/197.4.941