J/A+AS/126/357 Members of IC 2391 (Rolleston+ 1997)
Photometrically determined membership of the young, open cluster IC 2391
Rolleston W.R.J., Byrne P.B.
<Astron. Astrophys. Suppl. Ser. 126, 357 (1997)>
=1997A&AS..126..357R 1997A&AS..126..357R
ADC_Keywords: Clusters, open ; Photometry, CCD ; Photometry, UBVRI
Keywords: stars: evolution ; stars: late-type ;
open clusters: individual: IC 2391
Abstract:
New 4-colour BV(RI)KC CCD photometry to a limiting magnitude of
V≃19 is presented for 1428 objects observed towards the direction of
the young, open cluster IC 2391. We observed 36 (2'x3') fields within
17arcmin of the nominal cluster core. By fitting the theoretical
isochrones of D'Antona & Mazzitelli (1994ApJS...90..467D 1994ApJS...90..467D) to a
combination of colour-magnitude and colour-colour diagrams, we have
identified 17 stars as probable cluster members with a further 85
stars as possible members. The brightness distribution of low-mass
members is compared with the luminosity function observed for the
Pleiades and we estimate that the contamination due to background
giants should be small.
Description:
The photometric measurements were performed using the 1.0-m telescope
at the South African Astronomical Observatory (SAAO) at Sutherland
(Cape Province), during the period 15-22 January and 1-8 Februray
1994. The internal photometric errors are:
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Magnitude range V B-V V-R V-I
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V≤13.0 0.001 0.003 0.003 0.003
13.0-15.0 0.003 0.005 0.005 0.005
15.0-17.0 0.012 0.024 0.017 0.017
17.0-19.0 0.056 0.112 0.077 0.080
V≥19.0 0.104 0.197 0.140 0.145
------------------------------------------
Objects:
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RA (2000) DE Designation(s)
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08 40.2 -53 04 IC 2391
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 55 19 Photometry of the candidate members
fig4.ps 102 9612 Identification charts for the candidate members
of IC 2391
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- ID Identification number of the candidate member
<Cl* IC 2391 RB NNNN> in Simbad
6- 7 I2 h RAh Right Ascension J2000 (hours)
9- 10 I2 min RAm Right Ascension J2000 (minutes)
12- 16 F5.2 s RAs Right Ascension J2000 (seconds)
18 A1 --- DE- Declination J2000 (sign)
19- 20 I2 deg DEd Declination J2000 (degrees)
22- 23 I2 arcmin DEm Declination J2000 (minutes)
25- 30 F6.3 arcsec DEs Declination J2000 (seconds)
32- 37 F6.3 mag Vmag Johnson V-band magnitude
39- 43 F5.3 mag B-V (B-V) color
45- 49 F5.3 mag V-R ? (V-R)KC color
51- 55 F5.3 mag V-I ? (V-I)KC color
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Acknowledgements:
R. Rolleston <R.Rolleston(at)Queens-Belfast.AC.UK>
History:
* 08-Jul-1997: Identification chart (file "fig4.ps")
* 06-Mar-2013: table4 added
(End) Patricia Bauer [CDS] 08-Jul-1997