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Artículo

On the mass of the Galactic star cluster NGC 4337

Seleznev, Anton F.; Carraro, Giovanni; Capuzzo Dolcetta, Roberto; Monaco, Lorenzo; Baume, Gustavo LuisIcon
Fecha de publicación: 06/2017
Editorial: Wiley Blackwell Publishing, Inc
Revista: Monthly Notices of the Royal Astronomical Society
ISSN: 0035-8711
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Astronomía

Resumen

Only a small number of Galactic open clusters survive for longer than a few hundred million years. Longer lifetimes are routinely explained in term of larger initial masses, particularly quiet orbits and off-plane birthplaces. We derive in this work the actual mass of NGC 4337, one of the few open clusters in theMilkyWay inner disc that has managed to survive for about 1.5 Gyr.We derive its mass in two different ways. First, we exploit an unpublished photometric data set in the UBVI passbands to estimate - using star counts - the cluster luminosity profile, luminosity and mass function and hence its actual mass from both the luminosity profile and mass function. This data set is also used to infer crucial cluster parameters, such as the cluster half-mass radius and distance. Secondly, we make use of a large survey of cluster star radial velocities to derive dynamical estimates for the cluster mass. Using the assumption of virial equilibrium and neglecting the external gravitational field leads to values for the mass significantly larger than those obtained by means of the observed density distribution or with the mass function, but still marginally compatible with the inferred values of invisible mass in the form of both low-mass stars and remnants of high-mass stars in the cluster. Finally, we derive the cluster initial mass by computing the mass loss experienced by the cluster during its lifetime and adopting the various estimates of the actual mass.
Palabras clave: Individual , Ngc 4337 , Open Clusters And Associations , Open Clusters And Associations: General
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/40416
DOI: http://dx.doi.org/10.1093/mnras/stx177
URL: https://academic.oup.com/mnras/article-abstract/467/3/2517/3059493
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Articulos(IALP)
Articulos de INST.DE ASTROFISICA LA PLATA
Citación
Seleznev, Anton F.; Carraro, Giovanni; Capuzzo Dolcetta, Roberto; Monaco, Lorenzo; Baume, Gustavo Luis; On the mass of the Galactic star cluster NGC 4337; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 467; 3; 6-2017; 1-12
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