J/ApJS/116/263 VI photometry of open clusters (Piatti+ 1998)
Composite mv versus (V-I)0 diagram for template open clusters.
Piatti A.E., Claria J.J., Bica E.
<Astrophys. J. Suppl. Ser. 116, 263 (1998)>
=1998ApJS..116..263P 1998ApJS..116..263P (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Photometry, CCD
Keywords: open clusters and associations: general -
Hertzsprung-Russell diagram - stars: evolution
Abstract:
New CCD VI photometric data for 10 template open clusters with
accurately determined fundamental parameters are presented. From the
observed V versus V-I diagrams of the clusters, fiducial sequences
have been defined and transformed into the Mv versus (V-I)0
diagram by averaging sequences of template open clusters with similar
ages. The resulting composite Mv versus (V-I)0 diagram presents a
homogeneous set of empirical isochrones in the age range between 5Myr
and 4Gyr. These empirical isochrones show an overall very good
agreement with those computed from stellar evolutionary models.
Theoretical isochrones with moderate overshooting fit the observed
main sequences better than the canonical ones for clusters older than
600Myr. The present set of empirical isochrones will be useful for the
study of faint reddened open clusters
Objects:
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RA (2000) DE Designation(s)
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11 25 42 -43 15.0 NGC 3680
11 36 13 -61 36.9 NGC 3766
16 03 42 -60 30.0 NGC 6025
16 13 12 -54 13.0 NGC 6067
16 54 12 -41 48.0 NGC 6231
16 55 36 -39 30.0 NGC 6242
17 00 42 -44 40.0 NGC 6259
17 24 42 -49 57.0 IC 4651
17 50 42 -30 13.0 NGC 6451
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 46 46 Stars in NGC 3680 field magnitudes and colors
table5.dat 46 158 Stars in NGC 3766 field magnitudes and colors
table6.dat 46 67 Stars in NGC 6025 field magnitudes and colors
table7.dat 46 521 Stars in NGC 6067 field magnitudes and colors
table8.dat 46 90 Stars in NGC 6231 field magnitudes and colors
table9.dat 46 40 Stars in NGC 6242 field magnitudes and colors
table10.dat 46 226 Stars in NGC 6259 field magnitudes and colors
table11.dat 46 178 Stars in IC 4651 field magnitudes and colors
table12.dat 46 683 Stars in NGC 6451 field magnitudes and colors
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See also:
J/A+AS/127/423 : VI photometry of Westerlund 1 and 2 (Piatti+ 1998)
Byte-by-byte Description of file: table*.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Star Star number
5- 11 F7.2 pix Xpos X position
13- 18 F6.2 pix Ypos Y position
20- 25 F6.3 mag Vmag V magnitude
27- 31 F5.3 mag e_Vmag ? rms uncertainty on Vmag
33- 38 F6.3 mag V-I V-I colour index
40- 44 F5.3 mag e_V-I ? rms uncertainty on V-I
46 I1 --- o_Vmag Number of observations
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History: From ApJS electronic version
(End) James Marcout, Patricia Bauer [CDS] 12-Aug-1998