Results 261 to 270 of about 5,074,994 (301)
Some of the next articles are maybe not open access.
1994
The nature of research on double and multiple stars has changed drastically during the past several decades. Prior to then the research was mostly concerned with visual measures for the purposes of obtaining orbital elements and masses. Then came spectroscopic studies that (1) when combined with the visual orbital elements allowed the determination of ...
openaire +1 more source
The nature of research on double and multiple stars has changed drastically during the past several decades. Prior to then the research was mostly concerned with visual measures for the purposes of obtaining orbital elements and masses. Then came spectroscopic studies that (1) when combined with the visual orbital elements allowed the determination of ...
openaire +1 more source
1988
In the recent years new techniques are expanding visual binary star astronomy into previously inaccessible regimes of angular resolution and accuracy of measurements regarding the astrometric and astrophysical parameters of their components. New techniques and algorithms are providing enhanced sensitivity to low mass companions and the determination of
K. D. Rakos +7 more
openaire +1 more source
In the recent years new techniques are expanding visual binary star astronomy into previously inaccessible regimes of angular resolution and accuracy of measurements regarding the astrometric and astrophysical parameters of their components. New techniques and algorithms are providing enhanced sensitivity to low mass companions and the determination of
K. D. Rakos +7 more
openaire +1 more source
1928
To interpret astronomical phenomena in the realm of double and multiple stars, is to disclose a series of startling discoveries and point the way to further revelation, all having a tremendous significance in general physics, mathematics and philosophy as well.
openaire +1 more source
To interpret astronomical phenomena in the realm of double and multiple stars, is to disclose a series of startling discoveries and point the way to further revelation, all having a tremendous significance in general physics, mathematics and philosophy as well.
openaire +1 more source
CircNRIP1: An emerging star in multiple cancers
Pathology - Research and Practice, 2023Circular RNAs (circRNAs) are a new class of non-coding RNAs (ncRNAs) with a closed-loop structure that is highly stable and widely present in the eukaryotic cytoplasm. In recent years, circRNA has played a non-negligible role in the occurrence and development of a variety of diseases, which has attracted the research attention of many scholars ...
openaire +2 more sources
2007
When examining the statistics of multiple stars in the field, especially coming from visual binary star point of view, several problems present themselves. First, and most importantly, is distinguishing between physical multiples and optical pairs. Establishing physicality is not a simple ”binary” response as there are degrees of certainty.
Brian D. Mason, William I. Hartkopf
openaire +1 more source
When examining the statistics of multiple stars in the field, especially coming from visual binary star point of view, several problems present themselves. First, and most importantly, is distinguishing between physical multiples and optical pairs. Establishing physicality is not a simple ”binary” response as there are degrees of certainty.
Brian D. Mason, William I. Hartkopf
openaire +1 more source
The Formation of Multiple Stars
2007We have undertaken a series of SPH hydrodynamic + N-body simulations in order to explore the multiplicity properties of young stars. We find that binary and multiple stars are a natural outcome of collapsing turbulent flows, with a high incidence of N > 2 systems, specially among the higher mass objects.
Eduardo J. Delgado-Donate +1 more
openaire +1 more source
Multiplicity in Star Formation
2012The previous chapter formulated the characteristics of the formation of single young stars not taking in account effects of fragmentation. That fragmention in critical stages when seed stars form is likely to occur throughout the Galaxy. This implies that the vast majority of protostars and PMS stars are found in multiple systems.
openaire +1 more source
1991
The observational study of double and multiple stars is traditionally seen as comprised of several specialized subfields, each defined by particular observational selection effects. Improvements in increased precision and accuracy, higher resolution, higher signal-to-noise ratios, greater sensitivity etc.), are leading the study of double stars to a ...
openaire +1 more source
The observational study of double and multiple stars is traditionally seen as comprised of several specialized subfields, each defined by particular observational selection effects. Improvements in increased precision and accuracy, higher resolution, higher signal-to-noise ratios, greater sensitivity etc.), are leading the study of double stars to a ...
openaire +1 more source
1985
Commission 26 has changed its name. The new denomination, warmly promoted by Dommanget, represents more adequately the actual field of the Commission itself and appears as a good start for extending its interest beyond the traditional aspects (morphology and statistics) and plunging into problems connected with the origin, evolution, mass spectrum and ...
openaire +1 more source
Commission 26 has changed its name. The new denomination, warmly promoted by Dommanget, represents more adequately the actual field of the Commission itself and appears as a good start for extending its interest beyond the traditional aspects (morphology and statistics) and plunging into problems connected with the origin, evolution, mass spectrum and ...
openaire +1 more source
Current Work on Binary and Multiple Stars
Astrophysics and Space Science, 1985Following the kind invitation of Prof. Kopal, I am going to refer at this Conference on current work carried out by the IAU Commission 26, after having circulated a letter to all members to collect recent information at various places. I am grateful to those who replied in time for this report, which will also contain some personal considerations.
openaire +1 more source