J/A+A/409/541 UBV photometry of IC 2395 (Claria+, 2003)
IC 2395 and BH 47: only one open cluster in the Vela constellation
Claria J.J., Lapasset, E., Piatti, A.E., Ahumada, A.V.
<Astron. Astrophys. 409, 541 (2003)>
=2003A&A...409..541C 2003A&A...409..541C
ADC_Keywords: Clusters, open ; Photometry, UBV
Keywords: methods: observational - techniques: photometric -
stars: fundamental parameters -
open clusters and associations: individual: IC 2395, BH 47
Abstract:
We report UBV photoelectric photometry for 273 stars in the fields of
the open clusters IC 2395 and BH 47. Our postulate is that, rather
than two different clusters in this region of Vela, there is only one,
which we call IC 2395 = BH 47. The cluster is centered at about
RA = 8h 42min 33s, and DE = -48° 06' 48" (2000), its angular
diameter being ∼19'. The analysis of the photometric data yields 61
probable cluster members and 16 possible members. Photometric
membership probabilities show good agreement with those obtained from
a proper motion study for 21 stars in common. The reddening across the
cluster appears to be uniform, the mean E(B-V) value being
0.09±0.02. The true distance modulus is V0-Mv=9.52±0.10,
corresponding to a distance from the Sun of (800±40)pc and 48pc
below the Galactic plane. The cluster age, determined by fitting
isochrones with core overshooting, turns out to be (6±2)Myr. There
is a strong likelihood that IC 2395 = BH 47 is physically connected to
the Vela OB1C association.
Objects:
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RA (2000) DE Designation(s)
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08 42 33 -48 06 48 IC 2395 = Cl VDBH 47
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 93 273 UBV photometry and coordinates
cross.dat 101 273 Positions and cross-identifications with
high-accuracy astrometry
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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- 7 I3 pix Xpos X coordinates
9- 11 I3 pix Ypos Y coordinates
13- 14 I2 h RAh Hours of Right Ascension (J2000)
16- 17 I2 min RAm Minutes of Right Ascension (J2000)
19- 20 I2 s RAs Seconds of Right Ascension (J2000)
22 A1 --- DE- Declination sign (J2000)
23- 24 I2 deg DEd Degrees of declination (J2000)
26- 27 I2 arcmin DEm Minutes of declination (J2000)
29- 30 I2 arcsec DEs Seconds of declination (J2000)
32- 37 F6.3 mag Vmag V magnitude
39- 44 F6.3 mag B-V (B-V) colour index
46- 51 F6.3 mag U-B (U-B) colour index
53 I1 -- o_Vmag Number of measurements
55- 75 A21 -- Name Names in different catalogs
77- 87 A11 -- SpType Spectral type and luminosity class
89- 90 A2 -- Member [PNM ] Membership status (M, PM, NM)
92- 93 I2 % PMemb ? Membership probability
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Byte-by-byte Description of file: cross.dat
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Bytes Format Units Label Explanations
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1- 3 I3 -- Seq Star number, as in table1.dat
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- 28 F4.1 arcsec DEs Declination J2000 (seconds)
30 A1 --- r_Pos [MTU] Source of the position (1)
32- 40 A9 --- GSC Designation in GSC (I/254)
42- 52 A11 --- Tycho-2 Designation in Tycho-2 (I/259)
55- 60 F6.3 mag Vmag V magnitude
62- 67 F6.3 mag B-V (B-V) colour index
71- 82 A12 -- Name Names in HD or Durchmusterungen
84-101 A18 -- Remarks Remarks from B. Skiff
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Note (1): Source of position is:
M = 2MASS (II/246)
T = Tycho-2 (2000A&A...357..367H 2000A&A...357..367H, Cat. I/259)
U = UCAC1 (2000AJ....120.2131Z 2000AJ....120.2131Z, Cat. I/268)
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Acknowledgements: Juan J. Claria
History:
* 28-Jul-2003: First version, with table1.dat only
* 20-Oct-2003: Addition of cross.dat, from B. Skiff (Lowell Obs.)
(End) Patricia Bauer [CDS] 28-Jul-2003