HST observations of the core of the globular cluster NGC 6624

Details HST observations of the core of the globular cluster NGC 6624 HST observations of the core of the globular cluster NGC 6624

Feb 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....109..639s&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 109, no. 2, p. 639-649

Astronomy and Astrophysics

Astronomy

25

Color-Magnitude Diagram, Density Distribution, Globular Clusters, Position (Location), Blue Stars, Faint Object Camera, Hubble Space Telescope, Maximum Likelihood Estimates, X Rays

Scientific paper

We have used the Faint Object Camera (FOC) on the Hubble Space Telescope (HST) to observe three fields near the center of the post-collapse globular cluster NGC 6624 in B and V. We use individual stellar positions and a maximum-likelihood technique to measure a position for the cluster center. We then transfer this position and the position of the x-ray source 4U 1820-30 to right ascension and declination, and correct an error of 1.8 sec in an earlier paper. From star counts, we obtain a density profile, with a power-law cusp of slope -0.84 +/- 0.16. No flat core is evident. We construct color-magnitude diagrams down to the main-sequence turnoff near the cluster center, and more than three magnitudes below the turnoff in the outermost field at r = 28 sec. The former diagram reveals a central population of blue stragglers, which has not previously been observed in this cluster. These blue stragglers are quite similar in specific frequency to those recently observed by HST in the core of 47 Tuc, and their presence adds to the growing evidence of stellar interactions in dense globular-cluster cores.

Affiliated with

Also associated with

No associations

Rating

HST observations of the core of the globular cluster NGC 6624 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 HST observations of the core of the globular cluster NGC 6624, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and HST observations of the core of the globular cluster NGC 6624 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1629690