The origin and orbit of the old, metal-rich, open cluster NGC
6791. Insights from kinematics

J 2012

The origin and orbit of the old, metal-rich, open cluster NGC 6791. Insights from kinematics

JÍLKOVÁ, Lucie; Giovanni CARRARO; Bruno JUNGWIERT a Ivan MINCHEV

Základní údaje

Originální název

The origin and orbit of the old, metal-rich, open cluster NGC 6791. Insights from kinematics

Název česky

Původ a Galaktická dráha staré a na kovy bohaté otevřené hvězdokupy NGC 6791.

Autoři

JÍLKOVÁ, Lucie; Giovanni CARRARO; Bruno JUNGWIERT a Ivan MINCHEV

Vydání

Astronomy and Astrophysics, Paris, EDP Sciences, 2012, 0004-6361

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10308 Astronomy

Stát vydavatele

Francie

Utajení

není předmětem státního či obchodního tajemství

Odkazy

ADS

Impakt faktor

Impact factor: 5.084

Označené pro přenos do RIV

Ano

Kód RIV

RIV/00216224:14310/12:00057987

Organizační jednotka

Přírodovědecká fakulta

DOI

https://doi.org/10.1051/0004-6361/201117347

UT WoS

000304390900064

Klíčová slova česky

Galaxie: kinematika a dynamika; otevřené hvězdokupy; struktura Galaxie; NGC 6791

Klíčová slova anglicky

Galaxy: kinematics and dynamics; open clusters and associations: general; Galaxy: structure; open clusters and associations: individual: NGC 6791

Štítky

AKR, rivok

Příznaky

Recenzováno

Změněno: 15. 3. 2013 13:04, Mgr. Lucie Jílková, Ph.D.

Anotace

V originále

NGC 6791 is a unique stellar system among Galactic open clusters, which is at the same time one of the oldest open clusters and the most metal rich. It is located inside the solar circle, harbours a large population of binary stars, and possibly experienced prolonged star formation. The combination of all these properties is puzzling and poses the intriguing question of its origin. One possible scenario is that the cluster formed close to the Galactic Center and later migrated outward to its current location. In this work we study the cluster's orbit and investigate the possible migration processes that may have displaced NGC 6791 to its present-day position, under the assumption that it actually formed in the inner disk. To this aim we performed integrations of NGC 6791's orbit in a potential consistent with the main Milky Way parameters. In addition to analytical expressions for halo, bulge and disk, we also consider the effect of bar and spiral arm perturbations, which are expected to be very important for the disk dynamical evolution, especially inside the solar circle. Starting from state-of-the art initial conditions for NGC 6791, we calculated 1000 orbits back in time for about 1 Gyr turning different non-axisymmetric components of the global potential on and off. We then compared statistical estimates of the cluster's recent orbital parameters with the orbital parameters of 104 test-particles originating close to the Galactic Center (with initial galocentric radii in the range of 3-5 kpc) and undergoing radial migration during 8 Gyr of forward integration. We find that a model that incorporates a strong bar and spiral arm perturbations can indeed be responsible for the migration of NGC 6791 from the inner disk (galocentric radii of 3-5 kpc) to its present-day location. Such a model can provide orbital parameters that are close enough to the observed ones. However, the probability of this scenario as it results from our investigations is very low.

Návaznosti

GD205/08/H005, projekt VaV

Název: Fyzika Slunce, hvězd a hvězdných soustav

Investor: Grantová agentura ČR, Fyzika Slunce, hvězd a hvězdných soustav

MUNI/A/0968/2009, interní kód MU

Název: Fyzika hvězd a hvězdných soustav (Akronym: FYHA)

Investor: Masarykova univerzita, Fyzika hvězd a hvězdných soustav, DO R. 2020_Kategorie A - Specifický výzkum - Studentské výzkumné projekty

Citovat

JÍLKOVÁ, Lucie; Giovanni CARRARO; Bruno JUNGWIERT a Ivan MINCHEV. The origin and orbit of the old, metal-rich, open cluster NGC 6791. Insights from kinematics. Astronomy and Astrophysics. Paris: EDP Sciences, 2012, roč. 541, 05/2012, s. 64-75, 11 s. ISSN 0004-6361. Dostupné z: https://doi.org/10.1051/0004-6361/201117347.

@article{1079837,
   author = {Jílková, Lucie and Carraro, Giovanni and Jungwiert, Bruno and Minchev, Ivan},
   article_location = {Paris},
   article_number = {05/2012},
   doi = {https://doi.org/10.1051/0004-6361/201117347},
   keywords = {Galaxy: kinematics and dynamics; open clusters and associations: general; Galaxy: structure; open clusters and associations: individual: NGC 6791},
   language = {eng},
   issn = {0004-6361},
   journal = {Astronomy and Astrophysics},
   title = {The origin and orbit of the old, metal-rich, open cluster NGC 6791. Insights from kinematics},
   url = {http://adsabs.harvard.edu/abs/2012A%26A...541A..64J},
   volume = {541},
   year = {2012}
}

TY  - JOUR
ID  - 1079837
AU  - Jílková, Lucie - Carraro, Giovanni - Jungwiert, Bruno - Minchev, Ivan
PY  - 2012
TI  - The origin and orbit of the old, metal-rich, open cluster NGC 6791. Insights from kinematics
JF  - Astronomy and Astrophysics
VL  - 541
IS  - 05/2012
SP  - 64-75
EP  - 64-75
PB  - EDP Sciences
SN  - 00046361
KW  - Galaxy: kinematics and dynamics
KW  - open clusters and associations: general
KW  - Galaxy: structure
KW  - open clusters and associations: individual: NGC 6791
UR  - http://adsabs.harvard.edu/abs/2012A%26A...541A..64J
L2  - http://adsabs.harvard.edu/abs/2012A%26A...541A..64J
N2  - NGC 6791 is a unique stellar system among Galactic open clusters, which is at the same time one of the oldest open clusters and the most metal rich. It is located inside the solar circle, harbours a large population of binary stars, and possibly experienced prolonged star formation. The combination of all these properties is puzzling and poses the intriguing question of its origin. One possible scenario is that the cluster formed close to the Galactic Center and later migrated outward to its current location. In this work we study the cluster's orbit and investigate the possible migration processes that may have displaced NGC 6791 to its present-day position, under the assumption that it actually formed in the inner disk. To this aim we performed integrations of NGC 6791's orbit in a potential consistent with the main Milky Way parameters. In addition to analytical expressions for halo, bulge and disk, we also consider the effect of bar and spiral arm perturbations, which are expected to be very important for the disk dynamical evolution, especially inside the solar circle. Starting from state-of-the art initial conditions for NGC 6791, we calculated 1000 orbits back in time for about 1 Gyr turning different non-axisymmetric components of the global potential on and off. We then compared statistical estimates of the cluster's recent orbital parameters with the orbital parameters of 104 test-particles originating close to the Galactic Center (with initial galocentric radii in the range of 3-5 kpc) and undergoing radial migration during 8 Gyr of forward integration. We find that a model that incorporates a strong bar and spiral arm perturbations can indeed be responsible for the migration of NGC 6791 from the inner disk (galocentric radii of 3-5 kpc) to its present-day location. Such a model can provide orbital parameters that are close enough to the observed ones. However, the probability of this scenario as it results from our investigations is very low.
ER  -

JÍLKOVÁ, Lucie; Giovanni CARRARO; Bruno JUNGWIERT a Ivan MINCHEV. The origin and orbit of the old, metal-rich, open cluster NGC 6791. Insights from kinematics. \textit{Astronomy and Astrophysics}. Paris: EDP Sciences, 2012, roč.~541, 05/2012, s.~64-75, 11 s. ISSN~0004-6361. Dostupné z: https://doi.org/10.1051/0004-6361/201117347.

Přehled o publikaci