منابع مشابه
On the Crab Proper Motion
Owing to the dramatic evolution of telescopes as well as optical detectors in the last 20 yrs, we are now able to measure anew the proper motion of the Crab pulsar, after the classical result of Wyckoff and Murray (1977) in a time span 40 times shorter. The proper motion is aligned with the axis of symmetry of the inner Crab nebula and, presumably, with the pulsar spin axis.
متن کاملProper motion in Cygnus A
Our recent VLBI observations of the prominent FR II radio galaxy Cygnus A with the EVN and the VLBA reveal a pronounced two-sided jet structure. from which we could derive the kinematics of the jet and counter-jet. On the jet side and on mas scales, the jet seems to accelerate from βapp ≈ 0.1 − 0.2 (Krichbaum et al. 1998) at core-separations near 1 mas to βapp ≈ 0.4 − 0.6 at r ≥ 4 mas (H0 = 100...
متن کاملPolaris: astrometric orbit, position, and proper motion
We derive the astrometric orbit of the photo-center of the close pair α UMi AP (= α UMi Aa) of the Polaris multiple stellar system. The orbit is based on the spectroscopic orbit of the Cepheid α UMi A (orbital period of AP: 29.59 years), and on the difference ∆μ between the quasi-instantaneously measured HIPPARCOS proper motion of Polaris and the longterm-averaged proper motion given by the FK5...
متن کاملNew northern common proper motion pairs
A list of 705 new Northern Celestial Hemisphere common proper motion pairs as derived from the Second U.S. Naval Observatory CCD Astrograph Catalog is presented, along with details of their separation, motion, brightness and colour. Objects of particular interest are noted, and the use of the catalogue for such work gauged.
متن کاملThe Liverpool-Edinburgh High Proper Motion Survey
We present a catalogue of 6206 stars which have proper motions exceeding 0.18yr with an R-band faint magnitude limit of 19·5mag. This catalogue has been produced using SuperCOSMOS digitized R-Band ESO and UK Schmidt Plates in 131 Schmidt fields covering more than 3,000 square degrees (>7·5% of the whole sky) at the South Galactic Cap. The survey is ≥90% complete within the nominal limits of the...
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ژورنال
عنوان ژورنال: Astronomische Nachrichten
سال: 1885
ISSN: 0004-6337,1521-3994
DOI: 10.1002/asna.18851121903