Color Gradient in the King Type Globular Cluster NGC 7089

Details Color Gradient in the King Type Globular Cluster NGC 7089 Color Gradient in the King Type Globular Cluster NGC 7089

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jass...16...91s&link_type=abstract

Journal of Astronomy and Space Sciences, vol. 16, no. 2, p. 91-104

Astronomy and Astrophysics

Astronomy

Scientific paper

We use BV CCD images to investigate the reality of the color gradient within a King type globular cluster NGC 7089. Surface photometry shows that there is a strong radial color gradient in the central region of the cluster in the sense of bluer center with the amplitude of -0.39 +/- 0.07 mag/arcsec2 in (B - V). In the outer region of the cluster, however, the radial color gradient shows a reverse case, i.e., redder toward the center. (B - V) color profile which was derived from resolved stars in VGC 7089 field also shows a significant color gradient in the central region of the clusters, indicating that lights from the combination of red giant stars and blue horizontal branch stars cause the radial color gradient. Color gradient of the outer region of NGC 7089 may be due to the unresolved background of the cluster. Similar color gradients in the central area of clusters have been previously observed exserved exclusively in highly concentrated systems classified as post core collapse clusters. We caution, however, to confirm the reality of the color gradient from resolved stars, we need more accurate imaging data of the cluster with exceptional seeing condition because the effect of completeness correlates with local density of stars.

Affiliated with

Also associated with

No associations

Rating

Color Gradient in the King Type Globular Cluster NGC 7089 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Color Gradient in the King Type Globular Cluster NGC 7089, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Color Gradient in the King Type Globular Cluster NGC 7089 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1579811