ar X iv : a st ro - p h / 00 11 16 1 v 1 8 N ov 2 00 0 FACTOR ANALYSIS OF GALACTIC GLOBULAR CLUSTERS ON STRUC - TURAL PARAMETERS
نویسندگان
چکیده
Principal component method is used to study galactic globular clusters in 7-and 8-axis space of structural parameters. It is shown that the manifold properties of clusters with this set of parameters is determined mainly by two independent factors. This result may be useful for the theory of formation and evolution of clusters. In authors paper [2] the factor analysis (principal component method) of globular clusters on some main physical parameters was performed. It was shown that the manifold properties of clusters is determined mainly by two independent factors. The first of them is metallicity which is connected with the distance to Galaxy center, and the second one reflects the richness of the cluster. Analogous studies were performed by [1], and later by [3] and [4]. In this paper we return to this problem with some other set of parameters, different not only from our former set but also from the set used by Djorgovski and Meylan. The basedata was the catalogue of 125 clusters of [6] with the following parameters of clusters: concentration c, core-radius r c , a half-light radius r h , and other fraction-of-light radii r 10 , r 20 , r 30 , r 40. In the other case the quantity µ V (0), central surface brightness, was also included. The details of calculation one may find in our cited paper, or in the paper of [5]. The correlation matrix is given in tab.1.
منابع مشابه
ar X iv : a st ro - p h / 06 05 00 8 v 1 2 9 A pr 2 00 6 Simulations of globular clusters merging in galactic nuclear regions
We present the results of detailed N-body simulations regarding the interaction of four massive globular clusters in the central region of a triaxial galaxy. The systems undergo a full merging event, producing a sort of 'Super Star Cluster' (SSC) whose features are close to those of a superposition of the individual initial mergers. In contrast with other similar simulations, the resulting SSC ...
متن کاملar X iv : a st ro - p h / 04 11 16 2 v 1 8 N ov 2 00 4 Chandra observations of the recurrent nova IM Nor
The recurrent nova IM Nor was observed twice in X-rays with Chandra ACISS, 1 and 6 months after the optical outburst. It was not detected in the first
متن کاملar X iv : a st ro - p h / 06 11 50 9 v 1 1 6 N ov 2 00 6 A Sr - Rich Star on the Main Sequence of Omega Centauri
Abundance ratios relative to iron for carbon, nitrogen, strontium and barium are presented for a metal-rich main sequence star ([Fe/H]=–0.74) in the globular cluster ω Centauri. This star, designated 2015448, shows depleted carbon and solar nitrogen, but more interestingly, shows an enhanced abundance ratio of strontium [Sr/Fe]≈1.6 dex, while the barium abundance ratio is [Ba/Fe]≤0.6 dex. At th...
متن کاملar X iv : a st ro - p h / 01 11 13 6 v 1 7 N ov 2 00 1 1 Active Optics in Modern , Large Optical Telescopes
متن کامل
ar X iv : a st ro - p h / 02 11 45 7 v 1 2 0 N ov 2 00 2 Time variation of fundamental constants : two phenomenological models
Time variation of fundamental constants, a strong signal of new physics, is analyzed comparing extant data with two phenomenological models. Results are discussed.
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2000