J/ApJS/172/663 Infrared observations of the Pleiades (Stauffer+, 2007)
Near- and mid-infrared photometry of the Pleiades and a new list of substellar
candidate members.
Stauffer J.R., Hartmann L.W., Fazio G.G., Allen L.E., Patten B.M.,
Lowrance P.J., Hurt R.L., Rebull L.M., Cutri R.M., Ramirez S.V.,
Young E.T., Rieke G.H., Gorlova N.I., Muzerolle J.C., Slesnick C.L.,
Skrutskie M.F.
<Astrophys. J. Suppl. Ser., 172, 663-685 (2007)>
=2007ApJS..172..663S 2007ApJS..172..663S
ADC_Keywords: Magnitudes ; Photometry ; Associations, stellar
Keywords: open clusters and associations: individual (Pleiades)
stars: low-mass, brown dwarfs
Abstract:
We make use of new near- and mid-IR photometry of the Pleiades cluster
in order to help identify proposed cluster members. We also use the
new photometry with previously published photometry to define the
single-star main-sequence locus at the age of the Pleiades in a
variety of color-magnitude planes. The new near- and mid-IR photometry
extend effectively 2 mag deeper than the 2MASS All-Sky Point Source
catalog, and hence allow us to select a new set of candidate very
low-mass and substellar mass members of the Pleiades in the central
square degree of the cluster. We identify 42 new candidate members
fainter than Ks=14 (corresponding to 0.1M☉). These candidate
members should eventually allow a better estimate of the cluster mass
function to be made down to of order 0.04M☉. We also use new
IRAC data, in particular the images obtained at 8um, in order to
comment briefly on interstellar dust in and near the Pleiades.
Description:
The 2MASS 6x observations were conducted using the same freeze-frame
scanning technique used for the 2MASS (Skrutskie et al. 2006, Cat.
VII/233) but employed exposures 6 times longer. Imaging of the
Pleiades with Spitzer was obtained in 2004 April as part of a joint
GTO program conducted by the IRAC instrument team and the Multiband
Imaging Photometer for Spitzer (MIPS) instrument team.
Objects:
----------------------------------------------------------
RA (2000) DE Designation(s)
----------------------------------------------------------
03 47.4 +24 07 NAME PLEIADES = Cl Melotte 22
----------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 121 1416 Pleiades members: literature photometry
table4.dat 55 162 Single-star Pleiades loci
table5.dat 75 55 New candidate Pleiades members
notes.dat 75 34 Notes for table 2 references
--------------------------------------------------------------------------------
See also:
I/258 : Pleiades positions and proper motions (Wang+, 1996)
J/A+AS/100/607 : Pleiades very low mass proper motion members (Hambly+, 1993)
J/A+A/299/696 : Pleiades field Membership probabilities (Schilbach+, 1995)
J/A+A/320/74 : Radial velocities of Pleiades members (Mermilliod+ 1997)
J/A+A/332/575 : Pleiades member list (Belikov+ 1998)
J/MNRAS/313/347 : Pleiades low-mass stars and brown dwarfs (Pinfield+, 2000)
J/A+A/416/125 : RI photometry in alpha Per and Pleiades (Deacon+, 2004)
J/AJ/132/2665 : QUEST2 BRI photometry of Taurus-Auriga PMS (Slesnick+, 2006)
http://irsa.ipac.caltech.edu : 2MASS 6x database access
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 F9.6 deg RAdeg Right Ascension in decimal degrees (J2000)
11- 19 F9.6 deg DEdeg Declination in decimal degrees (J2000)
21- 26 F6.3 mag Jmag 2MASS J band magnitude
28- 32 F5.3 mag e_Jmag Uncertainty in Jmag
34- 39 F6.3 mag Hmag 2MASS H band magnitude
41- 45 F5.3 mag e_Hmag Uncertainty in Hmag
47- 52 F6.3 mag Ksmag 2MASS Ks band magnitude
54- 58 F5.3 mag e_Ksmag Uncertainty in Ksmag
60 A1 --- q_Jmag [A-U] 2MASS photometric quality flag for Jmag
61 A1 --- q_Hmag [A-U] 2MASS photometric quality flag for Hmag
62 A1 --- q_Ksmag [A-U] 2MASS photometric quality flag for Ksmag
63 I1 --- r_Ksmag [1/2] 2MASS catalog used (1)
65- 69 F5.2 mag Bmag ? The Johnson B band magnitude
71- 75 F5.2 mag Vmag ? The Johnson V band magnitude
77- 81 F5.2 mag Icmag ? The Cousins I (IC) band magnitude
83- 84 I2 --- Ref References for the BVIC photometry
86-121 A36 --- Names Other source names
--------------------------------------------------------------------------------
Note (1): the value indicates the 2MASS catalog, as:
1 = data from the standard 2MASS catalog (Cat. II/246);
2 = data come from the deep catalog (2MASS 6x-PSC).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 F6.3 mag Bmag ? The B band magnitude
8- 13 F6.3 mag Vmag ? The V band magnitude
15- 20 F6.3 mag Imag ? The I band magnitude
22- 27 F6.3 mag Ksmag The Ks band magnitude
29- 34 F6.3 mag 3.6mag Spitzer/IRAC 3.6 micron band magnitude
36- 41 F6.3 mag 4.5mag Spitzer/IRAC 4.5 micron band magnitude
43- 48 F6.3 mag 5.8mag ? Spitzer/IRAC 5.8 micron band magnitude
50- 55 F6.3 mag 8mag ? Spitzer/IRAC 8 micron band magnitude
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Seq Identification number (SI2M-NN) (1)
9- 16 F8.5 deg RAdeg Right Ascension in degrees (J2000)
18- 25 F8.5 deg DEdeg Declination in degrees (J2000)
27- 31 F5.2 mag Jmag 2MASS J band magnitude
33- 37 F5.2 mag Hmag 2MASS H band magnitude
39- 43 F5.2 mag Ksmag 2MASS Ks band magnitude
45- 49 F5.2 mag 3.6mag ?=- Spitzer/IRAC 3.6 micron band magnitude
51- 55 F5.2 mag 4.5mag ?=- Spitzer/IRAC 4.5 micron band magnitude
57- 61 F5.2 arcsec/yr pmRA Proper motion along right ascension (2)
63- 67 F5.2 arcsec/yr pmDE Proper motion along declination (2)
69- 75 A7 --- prevID Previous identification number (3)
--------------------------------------------------------------------------------
Note (1): <Cl* Melotte 22 SHF NN> in Simbad.
Note (2): pmRA and pmDE are the measured motions in arcsec over the 3.5yr
epoch difference between the 2MASS-6x and IRAC observations.
Note (3): <Cl* Melotte 22 HHJ NNN> (Hambly et al., 1993, Cat. J/A+AS/100/607)
or <Cl* Melotte 22 BPL NNN> (Pienfield et al., 2000, Cat. J/MNRAS/313/347)
in Simbad.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: notes.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Num Note number
4- 75 A72 --- Com Text
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 11-May-2009