J/A+A/399/543 Photometry and Coravel observations of IC 2488 (Claria+, 2003)
Multicolour photometry and Coravel observations of stars in the
southern open cluster IC 2488
Claria J.J., Piatti A.E., Lapasset E., Mermilliod J.-C.
<Astron. Astrophys. 399, 543 (2003)>
=2003A&A...399..543C 2003A&A...399..543C
ADC_Keywords: Clusters, open ; Photometry, UBV ; Photometry, DDO ;
Photometry, CMT1T2V ; Radial velocities
Keywords: methods: observational - cluster: open - individual: IC 2488 -
star: giant, abundances, HR diagram
Description:
We present new UBV photoelectric observations of 119 stars in the
field of the southern open cluster IC 2488, supplemented by DDO and
Washington photometry and Coravel radial velocities for a sample of
red giant candidates. Nearly 50% of the stars sampled - including
three red giants and one blue straggler - are found to be probable
cluster members. Photometric membership probabilities of the red giant
candidates show good agreement with those obtained from Coravel data.
A mean radial velocity of -2.63±0.06km/s is derived for the cluster
giants. The reddening across the cluster is found to be uniform, the
mean value being E(B-V)=0.24±0.04. IC 2488, located at a distance of
(1250±120) pc from the Sun and 96 pc below the Galactic plane, is
most probably not related to the planetary nebula ESO 166-PN21. A
metal abundance [Fe/H]=0.10±0.06 relative to the Sun is determined
from DDO data of the red giant members, in good agreement with the
[Fe/H] values derived from five independent Washington abundance
indices. An age of 180Myr is determined from the fitting of isochrones
computed with convective overshooting for Z=0.019. The isochrone for
logt=8.25 reproduces remarkably well not only the morphology of the
upper main sequence but also the observed red giant pattern.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 69 145 UBV photometry for stars in the field of IC 2488
table2.dat 41 12 DDO photometry of red giant candidates in IC 2488
table3.dat 53 14 Washington photometry of red giant candidates in
IC 2488
table4b.dat 43 67 Radial-velocity data of red giant candidates in
IC 2488
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See also:
J/A+AS/107/39 : IC 2714 UBV photometry (Claria+ 1994)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Star number
5- 8 I4 pix Xpos X coordinates
10- 13 I4 pix Ypos Y coordinates
16- 21 F6.3 mag Vmag V magnitude
22 A1 --- --- [)] Note on Vmag (1)
24- 29 F6.3 mag B-V (B-V) colour index
30 A1 --- --- [)] Note on B-V (1)
32- 37 F6.3 mag U-B (U-B) colour index
38 A1 --- --- [)] Note on U-B (1)
40 I1 --- Nmeas Number of measurements
44- 70 A27 --- Notes Remarks
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Note (1): Values from Pedreros (1987AJ.....94...92P 1987AJ.....94...92P), and not re-measured
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Star number
5- 9 F5.3 mag C45-48 C(45-48) index
11- 15 F5.3 mag e_C45-48 rms uncertainty on C45-48
17- 21 F5.3 mag C42-45 C(42-45) index
23- 27 F5.3 mag e_C42-45 rms uncertainty on C42-45
29- 33 F5.3 mag C41-42 C(41-42) index
35- 39 F5.3 mag e_C41-42 rms uncertainty on C41-42
41 I1 --- o_C45-48 Number of nights on which the star was observed
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq Star number
5- 9 F5.3 mag C-M C-M colour index
11- 15 F5.3 mag e_C-M rms uncertainty on C-M
17- 21 F5.3 mag M-T1 M-T1 colour index
23- 27 F5.3 mag e_M-T1 rms uncertainty on M-T1
29- 33 F5.3 mag T1-T2 T1-T2 colour index
35- 39 F5.3 mag e_T1-T2 rms uncertainty on T1-T2
41- 45 F5.3 mag T1mag T1 magnitude
47- 51 F5.3 mag e_T1mag rms uncertainty on T1mag
53 I1 --- o_T1mag Number of nights on which the star was observed
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Byte-by-byte Description of file: table4b.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- --- [IC 2488] Cluster name
11- 13 I3 --- Seq Star number
17- 27 F11.3 d HJD Heliocentric Julian Date
31- 36 F6.2 km/s RV Heliocentric Radial velocity
40- 43 F4.2 km/s e_RV Error on the radial velocity
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Acknowledgements: Jean-Claude Mermilliod
History:
* 18-Apr-2003: CD designations of stars 33, 104 and 114 have been corrected.
(End) Patricia Bauer [CDS] 13-Dec-2002