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J/AJ/107/1745                 HST UVI photometry of M15. II.    (Yanny+, 1994)

Globular cluster photometry with the Hubble Space Telescope. II. U, V, and I measurements of M15 Yanny B., Guhathakurta P., Bahcall J.N., Schneider D.P. <Astron. J. 107, 1745 (1994)> =1994AJ....107.1745Y
ADC_Keywords: Clusters, globular ; Photometry, UBV Abstract: 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) ∼ rα, with α ∼ -0.85±0.2, or with a King model with a core of radius ≲ 2" (best fit r(core)=1.3"). The inferred slope is in agreement with the theoretical value, α=-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 5x103 stars (and in U, V, and I of ≳1500 stars) are used to construct color-magnitude diagrams in the central 1' of M15. Fourteen blue straggler candidates are identified in the inner 20". 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. Objects: --------------------------------------------------- RA (2000) DE Designation(s) --------------------------------------------------- 21 29 58.2 +12 10 02 M 15 = NGC 7078 = C 2127+119 --------------------------------------------------- Addresses: Yanny B. Institute for Advanced Study, Princeton, New Jersey 08540 Guhathakurta P. Princeton University Observatory, Peyton Hall, Princeton, New Jersey 08544-1001 Bahcall J.N. Schneider D.P. Institute for Advanced Study, Princeton, New Jersey 08540 File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 37 1186 Stellar photometry and astrometry for M15 (V < 18.1)
See also: J/AJ/106/154 : HST Observations in inner region of M15 (Ferraro+ 1993) J/AJ/107/2067 : Fabry-Perot measurements of M15 (Gebhardt+, 1994) J/AJ/110/704 : RR Lyrae in M15 (Silbermann+ 1995) J/ApJ/347/251 : Dynamics of Globular Cluster M15 (Peterson+ 1989) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 4 I4 --- ID Identification number (YGBS number) 6- 11 F6.2 arcsec oRA Right ascension offset from AC 211=ID 653 (1) 13- 18 F6.2 arcsec oDE Declination offset from AC 211=ID 653 (1) 20- 24 F5.2 mag Vmag Visual magnitude (filter F555W) 26- 30 F5.2 mag V-I V-I color (F785LP - F555W) 32- 36 F5.2 mag U-V ? U-V color (F336W - F555W) 37 A1 --- n_U-V [ab] Note for U-V (2)
Note (1): Coordinates are arcsec offsets relative to AC 211 = ID 653. ID 653 is at 21:29:58.26+12:10:02.90 Note (2): a - the star is located outside the area covered by the U image. b - the star is not detected in U, though the area was covered.
References: Auriere M., Cordoni J.-P., =1981A&AS...46..347A Origin: AAS CD-ROM series, Volume 2, 1994
(End) Lee Brotzman [ADS] 17-May-1994, Patricia Bauer [CDS] 24-Oct-1994
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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