scholarly journals On the Absolute Proper Motions of Certain Double Stars showing Large Relative Motion

1904 ◽  
Vol 64 (5) ◽  
pp. 442-449
Author(s):  
H. Turner ◽  
J. Storey
Keyword(s):  
Relative Motion ◽  
Proper Motions ◽  
Double Stars ◽  
The Absolute

Investigation of relative motion in the triple system ADS 48 on the basis of Gaia DR2 and Pulkovo 26-inch refractor observations

2021 ◽  
pp. 89-98
Author(s):  
O. V. KIYAEVA ◽  
R. YA. ZHUCHKOV ◽  
I.S. IZMAILOV
Keyword(s):  
High Precision ◽  
Relative Motion ◽  
Apparent Motion ◽  
Triple System ◽  
Radial Velocities ◽  
Proper Motions ◽  
The Family ◽  
Outer Pair ◽  
Motion Parameters ◽  
Gaia Dr2

There are high-precision positions, proper motions, parallaxes and radial velocities at the instant 2015.5 for all three components of the star ADS 48 ABF in the catalogue Gaia DR2 (2018). According to these data relative motions and the family of orbits were calculated by the Apparent Motion Parameters (AMP) method (Kiselev and Kiyaeva, 1980), and the best orbit was chosen for the inner pair AB. A perturbation with the period of 11 years was discovered according to Pulkovo observations of the outer pair. The reasons for the perturbation are discussed.

scholarly journals Astrometry With Schmidt Telescopes

1984 ◽  
Vol 78 ◽  
pp. 217-224
Author(s):  
C A Murray
Keyword(s):  
Reference Frame ◽  
Proper Motions ◽  
Large Area ◽  
Full Field ◽  
Potential Value ◽  
Focal Surface ◽  
Single Plate ◽  
Trigonometric Parallaxes ◽  
The Absolute

Photographic astrometry, including work with Schmidt telescopes, can be divided into two main fields, (i) the measurement of positions of objects relative to a reference frame of stars with known celestial coordinates, and (ii) the measurement of relative proper motions and trigonometric parallaxes from a series of plates taken on the same field. The former demands a knowledge of the absolute transformation between angles on the sky and measurements on a plate, whereas in the latter we are only interested in differential transformations from plate to plate. The potential value of Schmidt telescopes for both these fields of astrometry lies in the large area of sky and range of magnitude which can be imaged on a single plate. The former advantage is however, to some extent offset by the curvature of the focal surface which means that, in order to utilize the full field the plates must be constrained to the form of the focal surface during exposure.

scholarly journals Newton’s Scholium on Time, Space, Place and Motion

2019 ◽  
Author(s):  
Robert Rynasiewicz
Keyword(s):  
Relative Motion ◽  
Absolute Space ◽  
Absolute Time ◽  
True Motion ◽  
Absolute Motion ◽  
Time Space ◽  
The Absolute ◽  
Absolute Quantity ◽  
Rotating Bucket

In the Scholium to the Definitions at the beginning of the Principia, Newton distinguishes absolute time, space, place, and motion from their relative counterparts. He argues that they are indeed ontologically distinct, in that the absolute quantity cannot be reduced to some particular category of the relative, as Descartes had attempted by defining absolute motion to be relative motion with respect to immediately ambient bodies. Newton’s rotating bucket experiment, rather than attempting to show that absolute motion exists, is one of five arguments from the properties, causes, and effects of motion. These arguments attempt to show that no such program can succeed, and thus that true motion can be adequately analyzed only by invoking immovable places, that is, the parts of absolute space.

scholarly journals An Investigation of the Absolute Proper Motions of the SCUSS Catalog

2015 ◽  
Vol 127 (949) ◽  
pp. 250-257 ◽  
Author(s):  
Xiyan Peng ◽  
Zhaoxiang Qi ◽  
Zhenyu Wu ◽  
Jun Ma ◽  
Cuihua Du ◽  
...  
Keyword(s):  
Proper Motions ◽  
The Absolute

scholarly journals An investigation of the absolute proper motions of the XPM catalogue

2010 ◽  
pp. no-no ◽  
Author(s):  
P. N. Fedorov ◽  
V. S. Akhmetov ◽  
V. V. Bobylev ◽  
A. T. Bajkova
Keyword(s):  
Proper Motions ◽  
The Absolute

Continuation of an account of the changes that have happened in the relative situation of double stars

1832 ◽  
Vol 1 ◽  
pp. 158-158
Keyword(s):  
Double Star ◽  
Proper Motions ◽  
Double Stars

In the former part of this paper, Dr. Herschel mentioned the changes he had noticed in the situation of six double stars; and in investigating the causes of those changes, he declared that he had recourse to the most authentic observations he could find of their motions in right ascensions and polar distance, especially in the instance of the double star Castor: but finding in the tables which have been lately published in the last volume of the Greenwich Observations, which give the proper motions of thirty-six stars, that (especially in the instance of the above-named star,) the motions are somewhat different from those he assigned to them in his former communication, he now undertakes to review the arguments he there used, in order to ascertain what will be the result of these new motions. As this investigation, which forms the first part of the present paper, has a continual reference to the contents of the preceding one, it will be in vain to attempt an abridgement, which could not be rendered intelligible within our usual limits. Nor can we enter here into a detail of the sequel of Dr. Herschel’s observations on the changes in the situation of a great number of additional double stars; this second part of the paper, in which they are fully detailed, being itself a minute of his proceedings, in which he is at particular pains to point out that these changes of situation are not the effect of parallax.

scholarly journals XIV. Continuation of an account of the changes that have happened in the relative situation of double stars

1804 ◽  
Vol 94 ◽  
pp. 353-384 ◽  
Keyword(s):  
Double Star ◽  
Proper Motions ◽  
Double Stars ◽  
North Polar ◽  
Right Ascension

In my former Paper, I have given the changes which have happened in the situation of six double stars. When the causes of these observed changes in the double star Castor were investigated, I had recourse to the most authentic observations I could find, of the motions in right-ascension and polar distance of this star. But the Tables which have been lately published, in the last volume of the observations made by the Astronomer Royal at Greenwich, give us now the proper motions of 36 principal stars, of which α Geminorum is one; and, as the motion of this star, especially in north polar distance, is very different from what it has been supposed in my former examination, it will be necessary to review the arguments which have been used, in order to ascertain what will be the result of this new motion. We shall here again follow the order of the paragraphs of the former Paper, and denote those which treat of the same motions, with the same letters, that they may be readily compared.

scholarly journals The Impact of Star Parallaxes and Very Accurate Proper Motions on Galactic Structure and Dynamics Studies

1980 ◽  
Vol 5 ◽  
pp. 799-804
Author(s):  
Per Olof Lindblad
Keyword(s):  
Absolute Magnitude ◽  
Galactic Structure ◽  
Proper Motions ◽  
Structure And Dynamics ◽  
Hyades Cluster ◽  
Magnitude Scales ◽  
The Absolute ◽  
Photometric Measurements ◽  
The Impact ◽  
Distance Indicators

Assuming that we have the absolute parallaxes and homogeneous set of proper motions for a large number of stars as described by the previous speakers - how should we use them in studies of galactic structure and dynamics?Concerning the parallaxes I will be very brief - the subject has already been discussed by Dr. Pagel. Clearly, the main importance of the absolute parallaxes obtained is in the calibration of photometric or spectrophotometric absolute magnitude scales. For a sufficient number of stars observed in the Hyades cluster at a distance of 50 pc and in the Scorpius-Centaurus association the systematic error, which lies at the bottom of all subsequent calibration of distance indicators, may be reduced to the same order as the accuracy of photometric measurements.

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