CCD UBV(RI)KC photometry and dynamics of the open cluster NGC 1513
Por:
Akkaya Oralhan I., Çakmak H., Karatas Y., Michel R., Bonatto C.
Publicada:
1 ene 2024
Resumen:
We derive astrophysical parameters of the open cluster NGC 1513 by means of colour indices built with new CCD UBV(RI)KC photometry. Based on early-type members, the mean foreground reddening and total to selective extinction ratio are E(B - V) = 0.79 ± 0.09 mag and RV = 2.85 ± 0.05. Through the differential grid method, we derive the metal abundance [Fe/H] = -0.06 dex (Z = +0.013), which is consistent with the value [Fe/H] = -0.088 of the bright giant member - LAMOST 695710060. Z = +0.013 isochrone fit to the V × (B - V) colour-magnitude diagram leads to a turn-off age of 224 ± 27 Myr (thus an intermediate-age cluster), and a distance modulus of (V0 - MV) = 10.90 ± 0.15 mag, thus implying a distance from the Sun d = 1514 ± 105 pc. Within the uncertainties, our photometric distance is consistent with the value d = 1435 ± 14 pc from the Gaia DR3 parallax. We find signs of small mass segregation through a minimum spanning tree analysis for the 190 most massive stars, together with the rather steep mass function (? = +2.39) slope. The high core to half-light radius ratio Rcore/Rh = 0.82, together with the compact half-light to tidal radius ratio Rh/Rt = 0.22, suggest that it is probably related to cluster-formation effects, due to little dynamical evolution, instead of driving its dynamical evolution by internal relaxation. Indeed, NGC 1513 is located in the second quadrant ( = 15259 and Galactocentric distance RGC = 9.57 kpc), which tends to minimize tidal effects by external processes and tidal disruption. Therefore, internal mass segregation effects in NGC 1513 seem to be more efficient than cluster evaporation processes. We find that NGC 1513 migrated about 0.50 kpc from its birth place. © 2024 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.
Filiaciones:
Akkaya Oralhan I.:
Department of Astronomy and Space Sciences, Faculty of Arts and Sciences, Erciyes University, Talas Yolu, Kayseri, 38039, Turkey
Çakmak H.:
Department of Computer Sciences, Science Faculty, Istanbul University, Vezneciler, Istanbul, 34134, Turkey
Karatas Y.:
Department of Astronomy and Space Sciences, Science Faculty, Istanbul University, Üniversite, Istanbul, 34116, Turkey
Michel R.:
Observatorio Astronómico Nacional, Universidad Nacional Autónoma de México, Apartado Postal 877, B.C., Ensenada, C.P. 22800, Mexico
Bonatto C.:
Departamento de Astronomia, Universidade Federal Do Rio Grande Do Su, CP 15051, RS, Porto Alegre, 91501-970, Brazil
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