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J/PASP/106/486           Mel 66 CCD photometry           (Anthony-Twarog+, 1994)

vbyHbeta CCD photometry of Melotte 66: a disk analog of Omega Centauri? Anthony-Twarog B.J., Twarog B.A., Sheeran M. <Publ. Astron. Soc. Pac. 106, 486 (1994)> =1994PASP..106..486A
ADC_Keywords: Clusters, open; Photometry, CCD Abstract: A CCD study of the peculiar open cluster, Melotte 66, on the vbyHbeta system is presented. The V,(b-y) color-magnitude diagram of this metal-deficient, old disk cluster confirms the anomalous features found in photographic BV studies and extends the main sequence to V=20. The main sequence exhibits a (b-y) color range significantly larger than expected from photometric errors alone; the (b-y) colors are correlated with Hbeta implying that the dispersion is real and is not the result of variable reddening across the cluster. The m1 indices for the turnoff stars imply a spread in [Fe/H] too small to explain the color range. Though the subgiant region is poorly defined, the region above the turnoff in the Hertzsprung gap is richly populated by a group of "yellow stragglers" whose membership is confirmed by radial star counts and radial velocities. The giant branch is richly populated but shows a smaller spread in color at a given V than one would expect from the turnoff region. More important, the giants exhibit a large scatter in m1, in contradiction with the turnoff observations. Various explanations for these observations are discussed, including CN variations among the giants triggered by either binary evolution or rapid rotation among the main-sequence stars. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 99 520 Photometric indices for Mel 66 stars
See also: J/MNRAS/174/471 : Melotte 66 (Hawarden+, 1976) J/A+A/283/911 : Abundances in NGC 2243 and Mel 66 (Gratton+ 1994) J/A+A/488/943 : Abundances of giants in four Galactic clusters (Sestito+ 2008) J/A+A/566/A39 : UBVI photometry of Melotte 66 (Carraro+, 2014) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
2- 5 I4 --- Haw ?=0 Hawarden identification number (1) 7- 10 I4 --- ID [1/1458] Identification number 12- 17 F6.2 pix Xpos X position 19- 24 F6.2 pix Ypos Y position 28- 33 F6.3 mag Vmag [11/18] V magnitude (apparent) 36- 40 F5.3 mag e_Vmag rms uncertainty on V magnitude 43- 47 F5.3 mag b-y (b-y) color 50- 54 F5.3 mag e_b-y rms uncertainty on (b-y) color 56- 61 F6.3 mag m1 m1 index 64- 68 F5.3 mag e_m1 rms uncertainty on m1 index 71- 75 F5.3 --- Hbeta ? Hβ index 78- 82 F5.3 --- e_Hbeta ? rms uncertainty on Hbeta index 86- 87 I2 --- Ny [2/16] Number of y frames 89- 90 I2 --- Nb [1/17] Number of b frames 92- 93 I2 --- Nv [2/16] Number of v frames 95- 96 I2 --- Nw [0/20] Number of Hβ wide frames 98- 99 I2 --- Nn [0/11] Number of Hβ narrow frames
Note (1): Hawarden T.G., 1976, MNRAS 243, 492 (J/MNRAS/243/492)
Addresses: Anthony-Twarog B.J. anthony (at) Twarog B.A. twarog (at) Sheeran M. Department of Physics and Astronomy, University of Kansas, Lawrence, Kansas 66045-2151 Origin: AAS CD-ROM series, Volume 2, 1994
(End) Lee Brotzman [ADS] 21-May-1994, Patricia Bauer [CDS] 03-Nov-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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