On the Motion of Stars in the Pleiades According to Gaia DR2 Data

Abstract—Several parameters of the Pleiades cluster were estimated. We used Gaia DR2 data on the coordinates, proper motions, and radial velocities of stars in regions with radius d° =2.5° and size 60° × 60° around the cluster center. Based on data on stars with magnitudes mG ≤ 18m, we constructed a...

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Published in:Astrophysical Bulletin
Main Authors: Danilov, V. M., Seleznev, A. F.
Format: Article in Journal/Newspaper
Language:English
Published: Pleiades journals 2020
Subjects:
Online Access:http://elar.urfu.ru/handle/10995/103164
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85099386165&doi=10.1134%2fS1990341320040045&partnerID=40&md5=39522a9f2a5a0862636314110bf57a2e
http://arxiv.org/pdf/2012.15289
https://doi.org/10.1134/S1990341320040045
id fturalfuniv:oai:elar.urfu.ru:10995/103164
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spelling fturalfuniv:oai:elar.urfu.ru:10995/103164 2024-05-19T07:45:42+00:00 On the Motion of Stars in the Pleiades According to Gaia DR2 Data Danilov, V. M. Seleznev, A. F. 2020 application/pdf http://elar.urfu.ru/handle/10995/103164 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85099386165&doi=10.1134%2fS1990341320040045&partnerID=40&md5=39522a9f2a5a0862636314110bf57a2e http://arxiv.org/pdf/2012.15289 https://doi.org/10.1134/S1990341320040045 en eng Pleiades journals Danilov V. M. On the Motion of Stars in the Pleiades According to Gaia DR2 Data / V. M. Danilov, A. F. Seleznev. — DOI 10.1134/S1990341320040045 // Astrophysical Bulletin. — 2020. — Vol. 75. — Iss. 4. — P. 407-424. 19903413 Final All Open Access, Green https://www.scopus.com/inward/record.uri?eid=2-s2.0-85099386165&doi=10.1134%2fS1990341320040045&partnerID=40&md5=39522a9f2a5a0862636314110bf57a2e http://arxiv.org/pdf/2012.15289 http://elar.urfu.ru/handle/10995/103164 45008163 doi:10.1134/S1990341320040045 85099386165 info:eu-repo/semantics/openAccess Astophys. Bull. Astrophysical Bulletin OPEN CLUSTERS AND ASSOCIATIONS STARS: KINEMATICS AND DYNAMICS Article info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2020 fturalfuniv https://doi.org/10.1134/S1990341320040045 2024-04-24T00:07:07Z Abstract—Several parameters of the Pleiades cluster were estimated. We used Gaia DR2 data on the coordinates, proper motions, and radial velocities of stars in regions with radius d° =2.5° and size 60° × 60° around the cluster center. Based on data on stars with magnitudes mG ≤ 18m, we constructed a map and profile of the density, luminosity and mass functions of the cluster, determined the cluster radius, 10.9° ± 0.3° (26.3 ± 0.7 pc), and the radius of its core, 2.62° (6.24 pc), and obtained estimates for the number of stars in the cluster, 1542 ± 121, and their mass, 855 ± 104M⊙; numbers of stars in the core of the cluster, 1097 ± 77, and their mass 665 ± 71M⊙. Distribution of stars with mG< 16m at distances rs from the cluster center in three-dimensional space of rs< 1 pc and at rs ∼ 1.4–5 pc contains radial density waves. Based on the data on stars with mG< 16m, we determined the average rotation velocity of the core of the cluster vc = 0.56 ± 0.07 km s−1 at distances d in the sky plane d ≤ 4.6 pc from its center. The rotation is “prograde”, the angle between the projection of the axis of rotation of the cluster core onto the sky plane and the direction to the North Pole of the Galaxy is ϕ = 18.8° ± 4.4°, the angle between the axis of rotation of the cluster core and the sky plane is ϑ = 43.2° ± 4.9°, the rotation velocity of the cluster core at a distance of d ≃ 5.5pc from its center is close to zero: vc = 0.1 ± 0.3 km s−1. According to the data on stars with mG< 17m, the velocity of the “retrograde” rotation of the cluster at a distance of d ≃ 7.1 pc from its center is vc = 0.48 ± 0.20 km s−1, the angle ϕ = 37.8° ± 26.4°. The dependences of moduli of the tangential and radial components of the velocity field of the stars of the cluster core in the sky plane on the distance d to the center of the cluster contain a number of periodic oscillations. The dispersions of the velocities of the stars in the cluster core σv increase on average with an increase in rs, which, like the radial density waves ... Article in Journal/Newspaper North Pole Ural Federal University (URFU): ELAR Astrophysical Bulletin 75 4 407 424
institution Open Polar
collection Ural Federal University (URFU): ELAR
op_collection_id fturalfuniv
language English
topic OPEN CLUSTERS AND ASSOCIATIONS
STARS: KINEMATICS AND DYNAMICS
spellingShingle OPEN CLUSTERS AND ASSOCIATIONS
STARS: KINEMATICS AND DYNAMICS
Danilov, V. M.
Seleznev, A. F.
On the Motion of Stars in the Pleiades According to Gaia DR2 Data
topic_facet OPEN CLUSTERS AND ASSOCIATIONS
STARS: KINEMATICS AND DYNAMICS
description Abstract—Several parameters of the Pleiades cluster were estimated. We used Gaia DR2 data on the coordinates, proper motions, and radial velocities of stars in regions with radius d° =2.5° and size 60° × 60° around the cluster center. Based on data on stars with magnitudes mG ≤ 18m, we constructed a map and profile of the density, luminosity and mass functions of the cluster, determined the cluster radius, 10.9° ± 0.3° (26.3 ± 0.7 pc), and the radius of its core, 2.62° (6.24 pc), and obtained estimates for the number of stars in the cluster, 1542 ± 121, and their mass, 855 ± 104M⊙; numbers of stars in the core of the cluster, 1097 ± 77, and their mass 665 ± 71M⊙. Distribution of stars with mG< 16m at distances rs from the cluster center in three-dimensional space of rs< 1 pc and at rs ∼ 1.4–5 pc contains radial density waves. Based on the data on stars with mG< 16m, we determined the average rotation velocity of the core of the cluster vc = 0.56 ± 0.07 km s−1 at distances d in the sky plane d ≤ 4.6 pc from its center. The rotation is “prograde”, the angle between the projection of the axis of rotation of the cluster core onto the sky plane and the direction to the North Pole of the Galaxy is ϕ = 18.8° ± 4.4°, the angle between the axis of rotation of the cluster core and the sky plane is ϑ = 43.2° ± 4.9°, the rotation velocity of the cluster core at a distance of d ≃ 5.5pc from its center is close to zero: vc = 0.1 ± 0.3 km s−1. According to the data on stars with mG< 17m, the velocity of the “retrograde” rotation of the cluster at a distance of d ≃ 7.1 pc from its center is vc = 0.48 ± 0.20 km s−1, the angle ϕ = 37.8° ± 26.4°. The dependences of moduli of the tangential and radial components of the velocity field of the stars of the cluster core in the sky plane on the distance d to the center of the cluster contain a number of periodic oscillations. The dispersions of the velocities of the stars in the cluster core σv increase on average with an increase in rs, which, like the radial density waves ...
format Article in Journal/Newspaper
author Danilov, V. M.
Seleznev, A. F.
author_facet Danilov, V. M.
Seleznev, A. F.
author_sort Danilov, V. M.
title On the Motion of Stars in the Pleiades According to Gaia DR2 Data
title_short On the Motion of Stars in the Pleiades According to Gaia DR2 Data
title_full On the Motion of Stars in the Pleiades According to Gaia DR2 Data
title_fullStr On the Motion of Stars in the Pleiades According to Gaia DR2 Data
title_full_unstemmed On the Motion of Stars in the Pleiades According to Gaia DR2 Data
title_sort on the motion of stars in the pleiades according to gaia dr2 data
publisher Pleiades journals
publishDate 2020
url http://elar.urfu.ru/handle/10995/103164
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85099386165&doi=10.1134%2fS1990341320040045&partnerID=40&md5=39522a9f2a5a0862636314110bf57a2e
http://arxiv.org/pdf/2012.15289
https://doi.org/10.1134/S1990341320040045
genre North Pole
genre_facet North Pole
op_source Astophys. Bull.
Astrophysical Bulletin
op_relation Danilov V. M. On the Motion of Stars in the Pleiades According to Gaia DR2 Data / V. M. Danilov, A. F. Seleznev. — DOI 10.1134/S1990341320040045 // Astrophysical Bulletin. — 2020. — Vol. 75. — Iss. 4. — P. 407-424.
19903413
Final
All Open Access, Green
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85099386165&doi=10.1134%2fS1990341320040045&partnerID=40&md5=39522a9f2a5a0862636314110bf57a2e
http://arxiv.org/pdf/2012.15289
http://elar.urfu.ru/handle/10995/103164
45008163
doi:10.1134/S1990341320040045
85099386165
op_rights info:eu-repo/semantics/openAccess
op_doi https://doi.org/10.1134/S1990341320040045
container_title Astrophysical Bulletin
container_volume 75
container_issue 4
container_start_page 407
op_container_end_page 424
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