J/A+AS/124/13 UBVRI photometry of the cluster Collinder 272 (Vazquez+ 1997)
UBVRI imaging photometry of the open cluster Cr 272
Vazquez R.A., Baume G., Feinstein A., Prado P.
<Astron. Astrophys. Suppl. Ser. 124, 13 (1997)>
=1997A&AS..124...13V 1997A&AS..124...13V (SIMBAD/NED BibCode)
ADC_Keywords: Photometry, UBVRI ; Clusters, open
Keywords: cluster: open: individual: Cr 272 -
stars: luminosity function, mass function - HR diagram
Description:
We present an extensive CCD UBVRI (Cousins system) photometric survey
in the region of the open cluster Collinder 272. Our data analysis
confirms that the cluster is situated in the outer border of Becker's
inner arm -II, at a distance d=2300pc and probably related to the
neighbor cluster Hogg 16. There is no highly evolved stars in the
cluster upper sequence and our age estimate based upon isochrones from
models computed with mass loss and overshooting, and other methods,
indicates a mean age of 13Myr. A statistical method based on the
removal of field stars was used to determine the luminosity function
and the initial mass function of the cluster. The cluster initial mass
function is characterized by a slope x=1.8.
Objects:
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RA (2000) DE Designation(s)
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13 30.6 -61 16 Cr 272 = Collinder 272 = C 1327-610
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2 61 1201 CCD photometric observations in Cr272
table2.tex 114 1681 LaTeX version of Table 2
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Byte-by-byte Description of file: table2
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Bytes Format Units Label Explanations
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1- 4 I4 --- No Sequence number
6- 11 F6.1 pix Xpos X position
13- 18 F6.1 pix Ypos Y position
20- 24 F5.2 mag Vmag V magnitude
25- 26 A2 --- u_Vmag [: ] Uncertainty flag on Vmag (1)
28- 32 F5.2 mag B-V B-V color index
33- 34 A2 --- u_B-V [: ] Uncertainty flag on B-V (1)
36- 40 F5.2 mag U-B ? U-B color index
41- 42 A2 --- u_U-B [: ] Uncertainty flag on U-B (1)
44- 48 F5.2 mag V-R ? V-R color index
49- 50 A2 --- u_V-R [: ] Uncertainty flag on V-R (1)
52- 56 F5.2 mag V-I ? V-I color index
57- 58 A2 --- u_V-I [: ] Uncertainty flag on V-I (1)
60- 61 A2 --- Rem Remark (2)
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Note (1): (:) errors larger than 0.04
(::) errors larger than 0.08
Note (2): lm = likely member
pm = probable member
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Acknowledgements: Ruben Vazquez
(End) Ruben Vazquez [Observ. Astron. La Plata] 17-Jan-1997