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J/AJ/106/154     HST Observations in inner region of M15   (Ferraro+ 1993)

Hubble Space Telescope / Faint Object Camera observations of the inner regions of the galactic globular cluster M15. Ferraro F.R., Paresce F. <Astron. J. 106, 154 (1993)> =1993AJ....106..154F
ADC_Keywords: Clusters, globular ; Photometry, ultraviolet Abstract: A set of high resolution images of the core of the Galactic Globular Cluster M15 (NGC 7078) were obtained for the first time with the Faint Object Camera on Hubble Space Telescope through the f/48-F140W, f/48-F220W and f/96-F342W ultraviolet filters. Two UV-Color-Magnitude Diagrams are presented for the ∼3000 objects measured in the 22"x22" field centered on the core covered by our observations. Out of these, 19 are variables discovered from the rms frame-to-frame scatter of the F220W images, 14 of which are probably RR Lyrae. The existence of the gap on the Horizontal Branch (HB) separating the bulk of the HB stars from the Blue Tail already known for the outer parts of the cluster, is confirmed for the core regions. The temperature and the mass distribution of the HB stars is derived from the ultraviolet color-color diagram. We also detect a well developed Blue Straggler sequence. At least two of the brighter blue stragglers reside within the sharp core. Objects: --------------------------------------------------- RA (2000) DE Designation(s) --------------------------------------------------- 21 29 58.2 +12 10 02 M 15 = NGC 7078 = C 2127+119 --------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1 48 280 Non-variable stars in the observed field table2 59 19 Variable stars in the observed field table3 31 9 Candidate Blue Stragglers stars in M15
See also: J/AJ/107/1745 : HST UVI photometry of M15. II. (Yanny+, 1994) 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: table1
Bytes Format Units Label Explanations
1- 3 I3 --- Name [1/280]+ Star sequence number 9- 12 F4.1 mag m140 []? Magnitude at 140 nm 17- 20 F4.1 mag m220 []? Magnitude at 220 nm 25- 28 F4.1 mag m342 []? Magnitude at 340 nm 33- 35 I3 pix X X coordinate 41- 43 I3 pix Y Y coordinate
Byte-by-byte Description of file: table2
Bytes Format Units Label Explanations
1- 3 A3 --- Vname Variable star sequence number 9- 18 A10 --- Type Star type 25- 28 F4.1 mag m140 []? Magnitude at 140 nm 33- 36 F4.1 mag m220 Magnitude at 220 nm 41- 44 F4.1 mag m342 []? Magnitude at 340 nm 49- 51 I3 pix X X coordinate 57- 59 I3 pix Y Y coordinate
Byte-by-byte Description of file: table3
Bytes Format Units Label Explanations
1- 3 A3 --- BSname Blue Stragglers candidate sequence number 9- 11 I3 --- Name Star sequence number of table1 18- 22 F5.2 mag m220 Magnitude at 220 nm 27- 31 F5.2 mag m220-m342 Color index
History: Prepared at CDS
(End) Francois Ochsenbein, Patricia Bauer [CDS] 05-Jul-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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