Globular cluster photometry with the Hubble Space Telescope. 2: U, V, and I measurements of M15

Details Globular cluster photometry with the Hubble Space Telescope. 2: U, V, and I measurements of M15 Globular cluster photometry with the Hubble Space Telescope. 2: U, V, and I measurements of M15

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....107.1745y&link_type=abstract

The Astronomical Journal, vol. 107, no. 5, p. 1745-1763

Astronomy and Astrophysics

Astronomy

51

Astronomical Photometry, Blue Stars, Density Distribution, Globular Clusters, Hubble Space Telescope, M Stars, Cameras, Charge Coupled Devices, Computerized Simulation, High Resolution, Monte Carlo Method, Optical Filters, Spatial Resolution

Scientific paper

The projected density distribution of resolved stars near the center of M15 is shown to be consistent with either a power-law cusp N(r) approximately ralpha, with alpha approximately -0.85 +/- 0.2, or with a King model with a core of radius approximately less than 2 sec. The inferred slope is in agreement with the theoretical value, alpha = -0.75, calculated by Bahcall and Wolf for the distribution of equal-mass stars surrounding a massive black hole and is also consistent with the radial profile expected from core collapse without a central black hole. The object AC 214 is a candidate for the central density cusp. Analysis of Monte Carlo simulations of the diffuse light indicates that, using current analysis techniques and available data, the residual light is not a reliable indicator of the true density distribution. This is contrary to earlier work. Photometric measurements in V and I of more than 5 x 103 stars (and in U, V, and I of approximately greater than 1500 stars) are used to construct color-magnitude diagrams in the central 1 min of M15. Fourteen blue straggler candidates are identified in the inner 20 sec. The central color gradient noticed by previous researchers is caused by a central depletion of bright red giant stars rather than an excess of blue stragglers or blue horizontal branch stars.

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