منابع مشابه
A multiwavelength study of the remnant of nova GK Persei
We present new observations of the nebular remnant of the old nova GK Persei 1901, in the optical using the Himalayan Chandra Telescope (HCT) and at low radio frequencies using the Giant Metrewave Radio Telescope (GMRT). The previous such study was by Seaquist et al (1989, hereafter S89). The dimensions of the shell in the optical emission lines of [NII], [OIII] and [OII] are 108×94 arcsec, 104...
متن کاملAn analysis of Bordeaux meridian transit circle observations of planets and satellites (1997-2007)
Context. Meridian transit circle observations of the planets and their satellites are regularly performed for ephemerides improvement. Some have been made in Bordeaux observatory during the period 1997-2007. Aims. This paper presents these observations and makes an analysis of the data in order to determine the accuracy of the observations, their interest for dynamical purpose and a comparison ...
متن کاملNew 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 position uncertainty measure on the circle
New position uncertainty (delocalization) measures for a particle on the circle are proposed and illustrated on several examples, where the previous measures (based on 2π-periodic position operators) appear to be unsatisfactory. The new measures are suitably constructed using the standard multiplication angle operator variances. They are shown to depend solely on the state of the particle and t...
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)...
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ژورنال
عنوان ژورنال: Lick Observatory Bulletins
سال: 1901
ISSN: 0075-9317
DOI: 10.5479/ads/bib/1901licob.1.40t