J/MNRAS/408/2457 Low-mass stars and brown dwarfs in Praesepe (Baker+, 2010)
Low-mass stars and brown dwarfs in Praesepe.
Baker D.E.A., Jameson R.F., Casewell S.L., Deacon N., Lodieu N., Hambly N.
<Mon. Not. R. Astron. Soc., 408, 2457-2475 (2010)>
=2010MNRAS.408.2457B 2010MNRAS.408.2457B
ADC_Keywords: Clusters, open ; Photometry, infrared ; Proper motions
Keywords: brown dwarfs - stars: low-mass -
stars: luminosity function, mass function -
open clusters and associations: individual: Praesepe
Abstract:
Presented are the results of a large and deep optical-near-infrared
multi-epoch survey of the Praesepe open star cluster using data from
the UKIRT Infrared Deep Sky Survey (UKIDSS) Galactic Clusters Survey.
Multiple colour-magnitude diagrams were used to select potential
members and proper motions were used to assign levels of membership
probability. From our sample, 145 objects were designated as high
probability members (p≥0.6) with most of these having been found by
previous surveys although 14 new cluster members are also identified.
Our membership assignment is restricted to the bright sample of
objects (Z<18). From the fainter sample, 39 candidates were found
from an examination of multiple colour-magnitude plots.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tableb1.dat 89 131 High probability members matched to previous
works
tablec1.dat 71 14 New high probability members
tabled1.dat 77 39 SDSS-UKIDSS selected candidates
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See also:
J/AJ/124/1570 : JHKs photometry in Praesepe (Adams+, 2002)
J/AJ/134/2340 : Membership of Praesepe & Coma Berenices clusters (Kraus+, 2007)
Byte-by-byte Description of file: tableb1.dat tablec1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- --- [UGCS]
6- 24 A19 --- UGCS Designation (JHHMMSS.ss+DDMMSS.s) (1)
26- 30 F5.2 mag Zmag UKIDSS Z magnitude
32- 36 F5.2 mag Ymag UKIDSS Y magnitude
38- 42 F5.2 mag Jmag UKIDSS J magnitude
44- 48 F5.2 mag Hmag UKIDSS H magnitude
50- 54 F5.2 mag Kmag UKIDSS K magnitude
56- 60 F5.1 mas/yr pmRA Proper motion along RA
62- 66 F5.1 mas/yr pmDE Proper motion along DE
68- 71 F4.2 --- Pmmb Membership probability
73- 76 I4 --- AD ? Sequential number in Adams et al.
(2002, Cat. J/AJ/124/1570, table1)
78- 80 I3 --- HSHJ ? Sequential number in Hambly et al. (1995,
Cat. J/A+AS/109/29),
<Cl* NGC 2632 HSHJ NNN> in Simbad
82- 84 I3 --- JS ? Sequential number in Jones & Cudworth
(1983AJ.....88..215J 1983AJ.....88..215J),
<Cl* NGC 2632 JC NNN> in Simbad
86- 89 I4 --- KH ? Sequential number in Kraus & Hillenbrand
(2007, Cat. J/AJ/134/2340, table3)
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Note (1): UGCS JHHMMSS.ss+DDMMSS. for known members (tableb1),
UGCS JHHMMSS.ss+DDMMSS.s for new members (tablec1).
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Byte-by-byte Description of file: tabled1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- --- [UGCS]
6- 24 A19 --- UGCS Designation (JHHMMSS.ss+DDMMSS.s)
26- 30 F5.2 mag Zmag UKIDSS Z magnitude
32- 36 F5.2 mag Ymag UKIDSS Y magnitude
38- 42 F5.2 mag Jmag UKIDSS J magnitude
44- 48 F5.2 mag Hmag UKIDSS H magnitude
50- 54 F5.2 mag Kmag UKIDSS K magnitude
56- 61 F6.2 mag/yr pmRA Proper motion along RA
63- 69 F7.2 mag/yr pmDE Proper motion along DE
71- 74 F4.2 --- Pmmb Membership probability
76- 77 I2 --- Fit Fit order (1)
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Note (1): For some objects not enough reference stars could be found to
perform the quadratic fit. In this case the fit was reduced to a
linear one (six free parameters) as indicated in the fit order column.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 16-Jun-2011