Studies of Star Cluster (A New Small Cluster Near NGC 2175 and some Remarks on the Latter)

Details Studies of Star Cluster (A New Small Cluster Near NGC 2175 and some Remarks on the Latter) Studies of Star Cluster (A New Small Cluster Near NGC 2175 and some Remarks on the Latter)

May 1970

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970bott....5..219p&link_type=abstract

Boletín de los Observatorios de Tonantzintla y Tacubaya Vol. 5, pp. 219-227 (1970) (http://www.astroscu.unam.mx/~bott/)

Astronomy and Astrophysics

Astronomy

19

Galaxy: Open Clusters And Associations: Individual (Ngc 2175S)

Scientific paper

A small cluster was discovered in the vicinity of the nebulous cluster NGC 2175. A bright patch of nebulosity encircles the small cluster which we designate as NGC 2175s. On long exposure plates the HII region of NGC 2175 has such extension that it overruns the small cluster. UBV photometry is done of the stars in the region of the two clusters. Twelve stars in NGC 2175s observed photoelectrically have served as standards to obtain the photographic magnitudes. The diagrams color-magnitude and color-color are given for both clusters. The reddening of NGC 2175s is 0.70 magnitudes while that of NGC 2175 is 0.20-0.30. The distances of the clusters are determined based on the data of the brightest stars in each cluster. These determinations show that the proximity of the two objects is a projection effect as the distances found for NGC 2175s and NGC 2175 are 3500 and 1950 pcs respectively. Starcounts are made using a polar réseau centered on the clusters. The stars in NGC 2175 seem to be arranged in circular form. The results of the starcounts show that the central region is almost devoid of stars. If this result is physically significant one should conclude that the stars in NGC 2175 are distributed as in a spherical shell. It is also found that the number of stars belonging to the clusters NGC 2175s and NGC 2175 are 14 and 65 whithin a radius of 3.6 pcs and 8.1 pcs respectively.

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