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J/ApJ/297/582       NGC 2213 BR photometry (Da Costa+, 1985)

The age of the LMC globular cluster NGC 2213 Da Costa G.S., Mould J.R., Crawford M.D. <Astrophys. J. 297, 582 (1985)> =1985ApJ...297..582D (SIMBAD/NED BibCode)
ADC_Keywords: Magellanic Clouds ; Clusters, globular ; Photometry, CCD Keywords: clusters: globular - galaxies: Magellanic Cloud - stars: evolution Abstract: The age of the LMC red globular cluster NGC 2213 has been estimated as 1.3±0.5x109yr from a color-magnitude diagram, derived from CCD photometry, that reveals the cluster main sequence. The accuracy of the age estimate, however, is limited by uncertainly in the LMC distance modulus, by uncertainty in the cluster metal abundance which appears to lie in the range one-half to one-sixth solar, by uncertainty in the reddening of the cluster, and by uncertainty in the extent to which the theoretical isochrones used for the age dating are affected by the neglect, in standard stellar models, of the interior mixing caused by convective overshoot in the stellar cores. Using the adopted reddening of E(B-V)=0.09 and assuming Y=0.2, isochrone best fits to the cluster main sequence are found for [M/H]=-0.3 if (m-M)0=18.7 and for [M/H]=-0.7 if (m-M)0=18.2. After allowance for the possible effects of convective overshoot, the corresponding ages are 0.9+0.5-0.3 and 1.6+0.8-0.4x109yr. Plausible alterations in the adopted reddening value and the adopted helium abundance also yield ages within these limits. Objects: ----------------------------------------- RA (2000) DE Designation(s) ----------------------------------------- 06 10.7 -71 37 NGC 2213 = LW 419 ----------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2 29 342 NGC 2213 cluster photometry table3 29 113 NGC 2213 field star photometry table4 29 168 NGC 2213 photometry from short-exposure frames
Byte-by-byte Description of file: table2 table3 table4
Bytes Format Units Label Explanations
1- 3 I3 --- Star Star number 5- 9 F5.2 mag Rmag R magnitude 11- 15 F5.2 mag B-R B- R color index 17- 19 I3 pix Xpos X position (1) 21- 23 I3 pix Ypos Y position (1) 25- 29 A5 --- Id Cross-Identification (only in table4) (2)
Note (1): East is up, and south is to the left. Note (2): Cross-identification to table1 and table2
Table1: NGC 2213 secondary standards --------------------------------------- Star R B-R X Y --------------------------------------- 1 17.54 2.39 34 313 2 17.83 1.59 34 430 3 18.45 1.41 56 197 4 16.68 1.41 56 197 5 18.56 1.46 104 119 6 17.62 1.56 153 478 7 17.62 1.56 153 478 8 17.99 1.69 159 444 9 17.33 1.77 189 382 10 17.81 1.67 213 454 History: Prepared via OCR at CDS.
(End) Marie-Jose Wagner, Patricia Bauer [CDS] 30-Sep-1996
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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