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J/AJ/127/2674       Globular clusters in Sculptor group      (Olsen+, 2004)

The globular cluster systems of the Sculptor group. Olsen K.A.G., Miller B.W., Suntzeff N.B., Schommer R.A., Bright J. <Astron. J., 127, 2674-2693 (2004)> =2004AJ....127.2674O
ADC_Keywords: Clusters, globular ; Photometry, CMT1T2V ; Radial velocities Keywords: galaxies: dwarf - galaxies: spiral - galaxies: star clusters Abstract: We use CTIO 4m Mosaic II images taken with the Washington CM and Harris R filters to identify candidate globular clusters in the six major galaxies of the Sculptor group: NGC 45, 55, 247, 254, 300, and 7793. From follow-up spectroscopy with Hydra-CTIO, we find 19 new globular clusters in NGC 55, 247, 253, and 300, bringing the total number of known Sculptor group globular clusters to 36. The newly discovered clusters have spectroscopic ages consistent with those of old Milky Way globular clusters, and the majority are metal-poor. Description: We surveyed the six Sculptor group galaxies NGC 45, 55, 247, 253, 300, and 7793 with the CTIO4 m telescope, Mosaic II camera and Washington CM and Harris R filters during the nights 1999 November 11-14. Objects: ------------------------------------------------- RA (2000) DE Designation(s) ------------------------------------------------- 00 47 08.6 -20 45 38 NGC 247 = UGCA 11 00 47 33.1 -25 17 18 NGC 253 = UGCA 13 00 54 53.5 -37 40 59 NGC 300 = ESO 295- 20 00 14 04.0 -23 10 51 NGC 45 = UGCA 4 00 15 08.4 -39 13 13 NGC 55 = ESO 293- 50 23 57 49.9 -32 35 20 NGC 7793 = ESO 349- 12 ------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 53 49 Log of Observations table3.dat 115 712 Candidate Sculptor group star clusters table4.dat 112 35 Properties of Sculptor group star clusters
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Target Target object name 12- 33 A22 --- Inst Instrument 36 A1 --- Filt [CMR] Filter used 38- 47 A10 "YYYY/MM/DD" ObsDate Observation date 49- 53 I5 s ExpTime Exposure time
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 12 A12 --- [OMS2004] Globular cluster designation (G1) 14- 15 I2 h RAh Hour of right ascension (J2000) 17- 18 I2 min RAm Minute of right ascension (J2000) 20- 25 F6.3 s RAs Second of right ascension (J2000) 27 A1 --- DE- Sign of the declination (J2000) 28- 29 I2 deg DEd Degree of declination (J2000) 31- 32 I2 arcmin DEm Arcminute of declination (J2000) 34- 38 F5.2 arcsec DEs Arcsecond of declination (J2000) 40- 43 F4.2 [pix2] logA Log of the SExtractor area (1) 45- 48 F4.2 --- ell SExtractor isophotal ellipticity 50- 55 F6.3 mag Cmag The Washington C-filter magnitude (2) 57- 61 F5.3 mag e_Cmag The 1 σ error in Cmag 63- 68 F6.3 mag Mmag The Washington M-filter magnitude (2) 70- 74 F5.3 mag e_Mmag The 1 σ error in Mmag 76- 81 F6.3 mag T1mag The Washington T1-filter magnitude (2) 83- 87 F5.3 mag e_T1mag The 1 σ error in T1mag 89- 95 F7.1 km/s HRV ? Heliocentric radial velocity 97-100 F4.1 km/s e_HRV ? The 1 σ error in HRV 102-114 A13 --- Note Additional note
Note (1): Where the pixel scale is 0.27 arcseconds per pixel. Note (2): the Washington filters have: ------------------------------------- Filter Effective_Wavelength Width ------------------------------------- C 391nm 110nm M 508nm 105nm T1 633nm 80nm T2 788nm 140nm -------------------------------------
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Star name (1) 13- 16 A4 --- OName Original name (2) 20- 31 A12 --- [OMS2004] Globular cluster designation (G1) 32- 36 F5.1 mag T1MAG Absolute T1 magnitude 38- 42 F5.3 mag E(B-V) B-V colour excess 44- 48 F5.3 mag (C-T1)0 Dereddened C-T1 colour index 50- 53 F4.3 mag e_(C-T1)0 ? rms uncertainty on (C-T1)0 56- 62 F7.4 [Sun] [Fe/H] ? Metallicity, determined from (C-T1)0 index 64- 67 F4.2 [Sun] e_[Fe/H] ? rms uncertainty on [Fe/H] 69- 73 F5.2 [Sun] [Fe/H]L ? Lick Metallicity 75- 78 F4.2 [Sun] e_[Fe/H]L ? rms uncertainty on [Fe/H]L 82- 86 F5.1 km/s HRV Heliocentric radial velocity 88- 92 F5.1 km/s e_HRV rms uncertainty on HRV 93 A1 --- r_HRV [de] Reference for HRV (3) 95- 98 F4.2 --- Broad ? Broadening factor 100 I1 --- Sigma ? Significance
Note (1): Star names use the acronyms: NGC = NGC NNN-NN, not in Simbad DG = Da Costa & Graham, 1982ApJ...261...70D, [DG82] N in Simbad BS = Beasley & Sharples, 2000MNRAS.311..673B, [BS2000] NGC 253 NN or [BS2000] NGC 55 NN Note (2): Original names use the acronyms: B = Blecha, 1986A&A...154..321B, [B86c] NN in Simbad (NGC 253) LA = Liller & Alcaino, 1983ApJ...264...53L, [LA83] NGC 55 NN in Simbad, and 1983ApJ...265..166L, [LA83] NGC 253 NN in Simbad Note (3): Velocity references are as follows: d = Da Costa & Graham, 1982ApJ...261...70D e = Beasley & Sharples, 2000MNRAS.311..673B
Global notes: Note (G1): The globular clusters are identified in Simbad as [OMS2004] NGC NNNN NNN
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 08-Jul-2004
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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