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J/ApJS/134/103 Low-mass members of IC 2391 (Barrado y Navascues+, 2001)
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Very low-mass stars and brown dwarfs of the young open cluster IC 2391.
Barrado y Navascues D., Stauffer J.R., Briceno C., Patten B., Hambly N.C.,
Adams J.D.
<Astrophys. J. Suppl. Ser. 134, 103 (2001)>
=2001ApJS..134..103B (SIMBAD/NED BibCode)
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ADC_Keywords: Clusters, open ; Stars, peculiar ; Photometry, CCD ;
Photometry, VRI ; Photometry, infrared
Keywords: open clusters and associations: individual (IC 2391) -
stars: low-mass, brown dwarfs
Abstract:
We have identified a large sample of probable low-mass members of the
young open cluster IC 2391 based on optical (VRIZ) and infrared (JHKs)
photometry. Our sample includes 50 probable members and 82 possible
members, both very low-mass stars and brown dwarfs. We also provide
accurate positions for these stars and brown dwarf candidates derived
from red UK Schmidt plates measured using the microdensitometer
SuperCOSMOS. Assuming an age of 53Myr, we estimate that we have
reached a mass of 0.025M_{sun}_, if the identified objects are indeed
members of IC 2391.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 88 244 IC 2391 candidate members
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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 --- CTIO CTIO number (Cl* IC 2391 CTIO NNN in Simbad)
5 I1 h RAh Right Ascension (J2000)
7- 8 I2 min RAm Right Ascension (J2000)
10- 14 F5.2 s RAs Right Ascension (J2000)
16 A1 --- DE- Sign of the Declination (J2000)
17- 18 I2 deg DEd Declination (J2000)
20- 21 I2 arcmin DEm Declination (J2000)
23- 26 F4.1 arcsec DEs Declination (J2000)
28- 32 F5.2 mag Vmag ? The V band magnitude
34- 39 F6.3 mag Imag The Cousins I_C_ band magnitude
41- 45 F5.3 mag R-I The Cousins (R-I)_C_ color
47- 50 F4.2 mag I-Z ? The (I-Z)_CTIO_ color
52- 57 F6.3 mag Jmag ? The J band magnitude
59- 64 F6.3 mag Hmag ? The H band magnitude
66- 71 F6.3 mag Kmag ? The K_s_ band magnitude
73- 76 F4.2 arcsec Sep ? Separation between optical and IR detections
78- 81 A4 --- Mem IC 2391 membership (1)
83- 87 A5 --- Com Comments on object (2)
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Note (1):
MEM = Located in all CM and CC diagrams with positions which indicate
membership.
MEM? = Possible member.
NM? = Possible non-members.
NM = Probable non-members.
Note (2):
SPEC+ = Probable member based on spectroscopy.
SPEC- = Probable member based on spectroscopy.
RED = High reddening.
VRRI = Probable non-member based on the (V-R),(R-I) diagram.
RIIK = Probable non-member based on the (R-I),(I-K) diagram.
Faint = Too faint to be detected by 2MASS.
NM-IR = No 2MASS data, but bright.
JKK = Possible member based on the K,(J-K) diagram.
IIK = Possible member based on the I,(I-K) diagram.
VVI = Possible member based on the V,(V-I) diagram.
RII = Possible member based on the I,(R-I) diagram.
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History:
From electronic version of the journal
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(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 08-Jun-2001