Results of Double Stars Observations at Nikolaev Observatory

Bodryagin, D. V.; Maigurova, N. V.

doi:10.18524/1810-4215.2015.28.70616

Cited by 4 publications

(5 citation statements)

References 2 publications

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“…The regular observations of binary and multiply stars at RI MAO have been carried out at two telescopes: Axial Meridian Circle (2013 -2015, 2018-2019) (Bodryagin et al, 2015) and KT-50 of Mobitel complex (2014-2019), (Bodryagin et al, 2016;2017, Maigurova et al,2018 . For several years, we did not observe double stars at AMC for technical reasons.…”

Section: Telescope and Observational Programmentioning

confidence: 99%

Probabilities of Physical Link Between the Components of the Selected Multiple Systems From WDS Catalog

Maigurova

Protsyuk

2019

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Astrometric CCD observations of visual components of double and multiple stars were performed using the RI MAO Axial Meridian Circle (AMC) with new Apogee Alta AI-F8300 CCD camera mounted at the telescope in 2018. Observations were carried out automatically in driftscan mode using a standard R filter. Objects for observational program were selected from the Washington Double Star Catalog (WDS). During the 23 nights, 983 observations of 579 double and multiple systems from the WDS catalog were obtained. Astrometric reductions of the observations showed high accuracy, with an average error of one position about 0.1" in right ascension and declination for stars up to 16 mag , which were observed more than 3 times.The purpose of our study was to measure the parameters of the mutual configuration of pairs from the original images and to draw some conclusions about the physical connection of the components in the selected systems. The measurement array that will be sent to the WDS database includes values of positional angle, angular separation, stellar magnitude difference, and epoch of the observation. A detailed analysis of the pairs of stars in the selected 5 systems to clarify their composition and the nature of the link between them was made. Positional data from the Hipparcos, Tycho2, UCAC4, Gaia DR2, and Pan-STARRS (PS1) catalogs were used as sources of additional information about the investigated stars. The search for possible invisible stars in the selected systems was performed using the statistical Wielen method, based on the analysis of the differences of instantaneous and long-term averaged proper motions of the stars. The proper motions of the space Gaia DR2 catalog were considered to be instantaneous, the long-term averaged proper motions were used from Tycho-2 and UCAC4 catalogs. Obtained values of the statistical parameter in some cases indicate a high probability of existence of invisible close components in the studied systems. Detailed comments of the results for each of the selected systems are provided.

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Section: Telescope and Observational Programmentioning

confidence: 99%

Probabilities of Physical Link Between the Components of the Selected Multiple Systems From WDS Catalog

Maigurova

Protsyuk

2019

OAP

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“…The regular observations of binary and multiple stars at RI «MAO» have been carried out since 2013 at two telescopes: Axial Meridian Circle and KT-50 of Mobitel complex (Shulga A.V. et al, 2012;Bodryagin et al, 2015;Bodryagin et al, 2016;Bodryagin et al, 2017). For this study we used observations that obtained at KT-50 telescope (Mobitel complex) during 2016 -2018.…”

Section: Observations and Reductionsmentioning

confidence: 99%

“…Position angles, separations, and their standard deviations were measured for each component of selected WDS systems. A more detailed description of the processing procedure is given in (Bodryagin et al, 2016). The results of measurements of A, B mutual configuration (with exception of WDS 11537+7345) are shown in Tab.2.…”

Section: Measurementsmentioning

confidence: 99%

Astrometric CCD Observations of Selected WDS Multiple Star Systems

Maigurova

Protsyuk

Bondarchuk

2018

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Main objective of the study is getting information about multiple and double stars that allow us to determine whether this pair is physically link system. Physically bounded star systems are source of unique information such as the ratio of the periods of pairs in one system, the relative orientation of the orbital planes, the distribution of components by mass which is extremely important for determining the parameters of star formation models and for testing stellar models evolution. The results of selected multiple star systems CCD observations, which were carried out at the KT-50 telescope of the Research Institute "Mykolaiv Astronomical Observatory" during the 2016-2018 years are presented. The Washington catalog of double stars (WDS) was used for observational list. There were presented detailed study of 14 multiple star systems. Astrometric reductions of the CCD frames with multiple system components at the current epoch were performed using "Astrometrica" software with Gaia DR2 reference catalog. The combination of the CCD received data with other Strasbourg base catalogs allowed to determine the new values of stars proper motions. Parameters of mutual component configuration (position angle and separation) were also measured for the components of the multiple star systems using REDUC software. The measures standard errors were 0.05" for separations and 0.2° for position angles. Combination ground based original observations with accurate astrometric catalogs available due to Strasbourg astronomical Data Center allowed us obtain new knowledge about investigated objects.

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“…The observations of double and multiple systems were conducted at the RI MAO in 2013-2020 with the AMС and KT-50 telescopes (Bodryagin et al, 2014(Bodryagin et al, , 2015(Bodryagin et al, , 2017. Observational data were matched with the Washington Double Star Catalog (Mason et al 2001) maintained by the US Naval Observatory.…”

Section: Introductionmentioning

confidence: 99%

“…Due to the long period, the binary's orbit can be traced only by numerous observations over the course of tens of years. By this reason the orbits were determined only for several thousand stars: for example, the Sixth Catalog of Orbits of Visual Binary Stars as of July 27, 2017(Hartkopf et al, 2001) included 2,739 orbits of 2,656 systems with sufficient accuracy to obtain estimates of the masses of the components.…”

Section: Introductionmentioning

confidence: 99%

Software for Search and Measuring of WDS Catalog Double and Multiple Stars From Database of Results of CCD Observation

Protsyuk¹,

Maigurova²

2020

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Double and multiple star systems are the source of unique information for determining the parameters of star formation models and for testing stellar models evolution. Therefore observations and measuring of their mutual configuration parameters is still important.Observations of double and multiple star systems at the Research Institute "Mykolaiv Astronomical Observatory" (RI MAO) were performed with different telescopes since 2013. In addition, we also have an observational database and proceeding results of the fields in open clusters vicinity, which were performed using the KT-50 telescope (D=500mm, F=3000mm) in 2011-2020. All astrometric processing was carried out by the Astrometrica software using UCAC4 or GAIA DR2 as reference catalogs. The catalogs of stars positions and proper motions in the vicinity of open clusters that contain more than 5.6 million stars were created as results of these observations. There are a lot of double and multiple stars in the fields with open clusters, which, moreover, could be the physical member of clusters. With this aim software for search and measuring of mutual configuration parameters of the double and multiple stars from the WDS was created. Our software uses previous reduction data from Astrometrica software and allows finding stars from double and multiple systems, which are presented in WDS catalog.We determined separations and position angles for pairs of the found WDS systems and checked observational array over 71 nights of 2019. Data of 9679 CCD images were reduced and 34277 WDS pairs were found in 7232 of them. Total numbers of unique pairs are 1504 in 1091 systems with average number of pair observations near 23. The standard errors of measurements were 0.15" for separations and 0.5° for position angles. The epoch difference between our observations and the last observation in the WDS database is in the range from 2 to 28 years. The comparison with the WDS data has shown that residual differences and their standard errors are (-0.03±0.24)" in separations and (-0.07±0.88)° in position angles for close observation periods. The obtained data are of original observations that extend the observation period of stars from double and multiple systems and can be used to construct orbits and to determine the masses of components. The calculated parameters of mutual configuration of the found pairs and estimates of differences in magnitudes of the components will be sent to the WDS database.

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Results of Double Stars Observations at Nikolaev Observatory

Cited by 4 publications

References 2 publications

Probabilities of Physical Link Between the Components of the Selected Multiple Systems From WDS Catalog

Probabilities of Physical Link Between the Components of the Selected Multiple Systems From WDS Catalog

Astrometric CCD Observations of Selected WDS Multiple Star Systems

Software for Search and Measuring of WDS Catalog Double and Multiple Stars From Database of Results of CCD Observation

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