منابع مشابه
New observations of 53 Persei
We gathered 37 new spectra of the B star 53 Persei spread over approximately 2 years. On these data, we performed a frequency and a mode analysis. We determined the physical parameters of 53 Persei and placed the star in the theoretical SPB instability strip. We also analysed the 110 photometric observations of the Hipparcos satellite. Our results show the presence of the two frequencies often ...
متن کاملOn the polarization of φ Persei
Polarimetric data of φ Per from recent observations with the HPOL spectropolarimeter and from an earlier study in the literature have been compared. It is shown that for measurements with accuracies ∆p ∼ 0.003%, temporal changes are readily detected, these seemingly being unrelated to periodic changes in scattering geometry associated with the binary nature of the star. From studies of the p(λ)...
متن کاملThe Double-Mode Cepheid V371 Persei Redux
A metallicity of 1⁄2Fe=H 1⁄4 0:05 to 0:40 was derived from four spectra of the peculiar beat Cepheid V371 Per. This conflicts with previous estimates ranging from 0:7 to 1:0 based on the period ratio. It is suggested that the discrepancy may be resolved by assuming near solar metallicity but a low mass. This is in accord with a suggestion by Sandage and Tammann that the AHB3 (or BL Her) stars a...
متن کامل53 Persei : a slowly pulsating B star ?
A new investigation of the behaviour of the star 53 Per was performed. New photometric observations allow to confirm twodominant periods p1=2.16 d, p2= 1.67 d.A third one p3= 3.64 d is detected. These long period variations are present in our radial velocities data and in old equivalent width data. The amplitude of the p1 = 2.16 d period increases from 1977 to 1991, while the amplitude of the 1...
متن کاملApophysomyces variabilis Infections in Humans
Clinical and epidemiological characterization of dengue hemorrhagic fever cases in northeastern Brazil. To the Editor: The fungus Apo-physomyces elegans (order Mucorales) is a thermotolerant species that causes severe infections among humans. In contrast to other fungi that cause zy-gomycosis, which have a worldwide distribution and are rarely found in immunocompetent hosts, A. elegans has been...
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ژورنال
عنوان ژورنال: Astronomische Nachrichten
سال: 1907
ISSN: 0004-6337,1521-3994
DOI: 10.1002/asna.19071750105