منابع مشابه
Triple - Mode Cepheid Masses
Observations of the light variations of AC Andromedae and TU Cassiopeiae are reviewed. The radial fundamental, first overtone, second overtone, and three nonlinear coupling beat pulsation periods of AC And are presented, confirming the Fitch and Szeidl work. For TU Cas the radial fundamental, first overtone, and several nonlinear coupling beat periods can be found, and a Fourier analysis has co...
متن کاملFuse Observations of Capella
Far Ultraviolet Spectroscopic Explorer (FUSE ) observations of the bright binary system Capella (α Aurigae; G1 III + G8 III) reveal a rich emission line spectrum containing neutral and ionic species, among them H i, O i, C iii, Ovi, Svi, Nev and Nevi. In addition the Fexviii 974.85 Å line, formed at temperatures of ≈ 6 × 10 K, is detected. Whereas the chromospheric and transition region emissio...
متن کاملFUSE Observations of Warm Absorbers in AGN
In a survey of the UV-brightest AGN using the Far Ultraviolet Spectroscopic Explorer (FUSE), we commonly find associated absorption in the O vi λλ1032, 1038 resonance doublet. Of 34 Type I AGN observed to date with z < 0.15, 16 show detectable O vi absorption. Most absorption systems show multiple components with intrinsic widths of ∼ 100 km s spread over a blue-shifted velocity range of < 1000...
متن کاملFUSE observations of hot white dwarfs
We have analyzed FUSE observations of six hot white dwarf stars: four DA white dwarfs with Teff >∼ 45 000 K, the DAO Feige 55 (Teff ≈ 55 000 K), and the DA CD−38◦ 10980 (Teff ≈ 24 000 K). Photospheric lines from Si IV, PV, and S VI can be observed in the majority of the five hotter objects. Feige 55 shows also several other heavier elements. The measured abundances agree only partly with the pr...
متن کاملStructural Properties of s - Cepheid Velocity Curves ⋆
The light curves of the first overtone Pop. I Cepheids (s-Cepheids) show a discontinuity in their φ 21 vs. P diagram, near P = 3.2 day. This feature, commonly attributed to the 2:1 resonance between the first and the fourth overtones (ω 4 ≈ 2ω 1), is not reproduced by the hydrodynamical models. With the goal of reexamining the resonance hypothesis, we have obtained new CORAVEL radial velocity c...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 2004
ISSN: 0252-9211
DOI: 10.1017/s0252921100010976