Improving the Orbits of Four Visual Binaries Using Gaia DR2 Data and Observations with the 26-inch Refractor of Pulkovo Observatory

2021 ◽  
Vol 65 (3) ◽  
pp. 209-223
Author(s):  
L. G. Romanenko ◽  
I. S. Izmailov
Keyword(s):  
Pulkovo Observatory ◽  
Gaia Dr2 ◽  
Visual Binaries

Astrometric observations of visual binaries using 26‐inch refractor at Pulkovo Observatory during 2014–2019

2020 ◽  
Vol 341 (8) ◽  
pp. 762-769
Author(s):  
Igor Izmailov ◽  
Aleksey Rublevsky ◽  
Arina Apetyan
Keyword(s):  
Pulkovo Observatory ◽  
Visual Binaries

scholarly journals Comparison of Gaia and Hipparcos parallaxes of close visual binary stars and the impact on determinations of their masses

2021 ◽  
Vol 38 ◽  
Author(s):  
Mashhoor Ahmad Al-Wardat ◽  
Abdallah M. Hussein ◽  
Hamid M. Al-Naimiy ◽  
Martin A. Barstow
Keyword(s):  
Binary Stars ◽  
Precise Measurement ◽  
Stellar Systems ◽  
Dramatic Improvement ◽  
Fundamental Parameters ◽  
Visual Binary ◽  
Visual Binary Stars ◽  
The Impact ◽  
Gaia Dr2 ◽  
Visual Binaries

Abstract Precise measurement of the fundamental parameters of stellar systems, including mass and radius, depends critically on how well the stellar distances are known. Astrometry from space provides parallax measurements of unprecented accuracy, from which distances can be derived, initially from the Hipparcos mission, with a further refinement of that analysis provided by van Leeuwen in 2007. The publication of the Gaia DR2 catalogue promises a dramatic improvement in the available data. We have recalculated the dynamical masses of a sample of 1 700 close visual binary stars using Gaia DR2 and compared the results with masses derived from both the original and enhanced Hipparcos data. We show the van Leeuwen analysis yields results close to those of Gaia DR2, but the latter are significantly more accurate. We consider the impact of the Gaia DR2 parallaxes on our understanding of the sample of visual binaries.

Sixteen Open Clusters Discovered with Sample-based Clustering Search of Gaia DR2

2020 ◽  
Vol 132 (1009) ◽  
pp. 034502 ◽  
Author(s):  
ChaoJie Hao ◽  
Ye Xu ◽  
ZhenYu Wu ◽  
ZhiHong He ◽  
ShuaiBo Bian
Keyword(s):  
Open Clusters ◽  
Clustering Search ◽  
Gaia Dr2

scholarly journals Gaia DR2 data and the evolutionary status of eight high-velocity hot post-AGB candidates

2020 ◽  
Vol 72 (6) ◽  
Author(s):  
Mudumba Parthasarathy ◽  
Tadafumi Matsuno ◽  
Wako Aoki
Keyword(s):  
Effective Temperature ◽  
High Velocity ◽  
Circumstellar Dust ◽  
Evolutionary Status ◽  
Agb Stars ◽  
Horizontal Branch ◽  
Dust Shells ◽  
The Past ◽  
Gaia Dr2 ◽  
Branch Star

Abstract From Gaia DR2 data of eight high-velocity hot post-AGB candidates, LS 3593, LSE 148, LS 5107, HD 172324, HD 214539, LS IV −12 111, LS III +52 24, and LS 3099, we found that six of them have accurate parallaxes which made it possible to derive their distances, absolute visual magnitudes (MV) and luminosity (log L/L⊙). All the stars except LS 5107 have an accurate effective temperature (Teff) in the literature. Some of these stars are metal poor, and some of them do not have circumstellar dust shells. In the past, the distances of some stars were estimated to be 6 kpc, which we find to be incorrect. The accurate Gaia DR2 parallaxes show that they are relatively nearby, post-AGB stars. When compared with post-AGB evolutionary tracks we find their initial masses to be in the range 1 M⊙ to 2 M⊙. We find the luminosity of LSE 148 to be significantly lower than that of post-AGB stars, suggesting that this is a post-horizontal-branch star or post-early-AGB star. LS 3593 and LS 5107 are new high-velocity hot post-AGB stars from Gaia DR2.

scholarly journals Orbits and Individual Masses of Some Visual Binaries

Astrophysics ◽  
2021 ◽  
Vol 64 (1) ◽  
pp. 41-53
Author(s):  
E. A. Elkholy ◽  
W. H. Elsanhoury ◽  
M. I. Nouh
Keyword(s):  
Visual Binaries
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