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We newly calculated Mo iv–vii oscillator strengths to consider their radiative and collisional bound-bound transitions in detail in our NLTE stellar-atmosphere models for the analysis of Mo lines exhibited in high-resolution and high S/N UV observations of RE 0503−289. To identify molybdenum lines in the ultraviolet (UV) spectra of the DA-type white dwarf G191−B2B and the DO-type white dwarf RE 0503−289 and, to determine their photospheric Mo abundances, reliable Mo iv–vii oscillator strengths are used.
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These are strongly dependent on the reliability of the atomic data that is used for their calculation.Īims. For the spectral analysis of high-resolution and high signal-to-noise (S/N) spectra of hot stars, state-of-the-art non-local thermodynamic equilibrium (NLTE) model atmospheres are mandatory. Kruk 5ġ Institute for Astronomy and Astrophysics, Kepler Center for Astro and Particle Physics, Eberhard Karls University, Sand 1, 72076 Tübingen, GermanyĮ-mail: Physique Atomique et Astrophysique, Université de Mons – UMONS, 7000 Mons, Belgiumģ IPNAS, Université de Liège, Sart Tilman, 4000 Liège, BelgiumĤ Astronomisches Rechen-Institut, Zentrum für Astronomie, Ruprecht Karls University, Mönchhofstraße 12-14, 69120 Heidelberg, Germanyĥ NASA Goddard Space Flight Center, Greenbelt, MD 20771, USAĬontext. Astronomical objects: linking to databases.Including author names using non-Roman alphabets.Suggested resources for more tips on language editing in the sciences Punctuation and style concerns regarding equations, figures, tables, and footnotes In this case, the field decays exponentially along the waveguide axis and the wave is thus evanescent. The wave equations are also valid below the cutoff frequency, where the longitudinal wave number is imaginary.
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As a voltage ratio this is a fall to 1 / 2 ≈ 0.707 Most frequently this proportion is one half the passband power, also referred to as the 3 dB point since a fall of 3 dB corresponds approximately to half power. In electronics, cutoff frequency or corner frequency is the frequency either above or below which the power output of a circuit, such as a line, amplifier, or electronic filter has fallen to a given proportion of the power in the passband. 1.1 Single-pole transfer function example.In the case of a waveguide or an antenna, the cutoff frequencies correspond to the lower and upper cutoff wavelengths. Alternatively, a stopband corner frequency may be specified as a point where a transition band and a stopband meet: a frequency for which the attenuation is larger than the required stopband attenuation, which for example may be 30 dB or 100 dB. It is sometimes taken to be the point in the filter response where a transition band and passband meet, for example, as defined by a half-power point (a frequency for which the output of the circuit is −3 dB of the nominal passband value). Typically in electronic systems such as filters and communication channels, cutoff frequency applies to an edge in a lowpass, highpass, bandpass, or band-stop characteristic – a frequency characterizing a boundary between a passband and a stopband. In physics and electrical engineering, a cutoff frequency, corner frequency, or break frequency is a boundary in a system's frequency response at which energy flowing through the system begins to be reduced ( attenuated or reflected) rather than passing through. (The slope −20 dB per decade also equals −6 dB per octave.) A Bode plot of the Butterworth filter's frequency response, with corner frequency labeled.