Asymmetrical tidal tails of open star clusters: stars crossing their cluster's prah(dagger) challenge Newtonian gravitation

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F22%3A10455587" target="_blank" >RIV/00216208:11320/22:10455587 - isvavai.cz</a>

Result on the web

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=8xI_Di7qe6" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=8xI_Di7qe6</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/mnras/stac2563" target="_blank" >10.1093/mnras/stac2563</a>

Result language

angličtina

Original language name

Asymmetrical tidal tails of open star clusters: stars crossing their cluster's prah(dagger) challenge Newtonian gravitation

Original language description

After their birth a significant fraction of all stars pass through the tidal threshold (prgh) of their cluster of origin into the classical tidal tails. The asymmetry between the number of stars in the leading and trailing tails tests gravitational theory. All five open clusters with tail data (Hyades, Praesepe, Coma Berenices, COIN-Gaia 13, NGC 752) have visibly more stars within d(cl) approximate to 50 pc of their centre in their leading than their trailing tail. Using the Jerabkova-compact-convergent-point (CCP) method, the extended tails have been mapped out for four nearby 600-2000 Myr old open clusters to d(cl) &gt; 50 pc. These are on near-circular Galactocentric orbits, a formula for estimating the orbital eccentricity of an open cluster being derived. Applying the Phantom of Ramses code to this problem in Newtonian gravitation the tails are near-symmetrical. In Milgromian dynamics (MOND), the asymmetry reaches the observed values for 50 &lt; d(cl)/pc &lt; 200 being maximal near peri-galacticon, and can slightly invert near apo-galacticon, and the Kupper epicyclic overdensities are asymmetrically spaced. Clusters on circular orbits develop orbital eccentricity due to the asymmetrical spill-out, therewith spinning up opposite to their orbital angular momentum. This positive dynamical feedback suggests Milgromian open clusters to demise rapidly as their orbital eccentricity keeps increasing. Future work is necessary to better delineate the tidal tails around open clusters of different ages and to develop a Milgromian direct n-body code.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

<a href="/en/project/GA20-21855S" target="_blank" >GA20-21855S: The dynamics of dense star clusters with primordial binaries and massive black holes</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

e-ISSN

1365-2966

Volume of the periodical

517

Issue of the periodical within the volume

3

Country of publishing house

GB - UNITED KINGDOM

Number of pages

27

Pages from-to

3613-3639

UT code for WoS article

000872711900012

EID of the result in the Scopus database

2-s2.0-85144893357