J/ApJ/647/1180 Infrared photometry of Taurus SFR (Luhman+, 2006)
A survey for new members of Taurus with the Spitzer Space Telescope.
Luhman K.L., Whitney B.A., Meade M.R., Babler B.L., Indebetouw R.,
Bracker S., Churchwell E.B.
<Astrophys. J., 647, 1180-1191 (2006)>
=2006ApJ...647.1180L 2006ApJ...647.1180L
ADC_Keywords: Associations, stellar ; Photometry, infrared
Keywords: infrared: stars - stars: evolution - stars: formation -
stars: low-mass, brown dwarfs -
stars: luminosity function, mass function - stars: pre-main-sequence
Abstract:
We present the results of a search for new members of the Taurus
star-forming region using the Infrared Array Camera (IRAC) aboard the
Spitzer Space Telescope. With IRAC images of 29.7deg2 of Taurus at
3.6, 4.5, 5.8, and 8.0um, we have identified sources with red
mid-infrared colors indicative of disk-bearing objects and have
obtained optical and infrared spectra of 23 of these candidate
members. Through this work, we have discovered 13 new members of
Taurus, two of which have spectral types later than M6 and thus are
likely to be brown dwarfs, according to the theoretical evolutionary
models of Chabrier & Baraffe (2000ApJ...542..464C 2000ApJ...542..464C). This survey
indicates that the previous census of Taurus has a completeness of 80%
for members with disks. The new members that we have found do not
significantly modify the previously measured distributions of Taurus
members as a function of position, mass, and extinction. For instance,
we find no evidence for a population of highly reddened brown dwarfs
({LAMBDA}K∼2) that has been missed by previous optical and
near-infrared surveys, which suggests that brown dwarf disks are not
significantly more flared than disks around stars. In addition to the
new members, we also present IRAC photometry for the 149 previously
known members that appear within this survey, which includes 27
objects later than M6.
Description:
To search for new members of Taurus, we used unpublished archival
images at 3.6, 4.5, 5.8, and 8.0um that were obtained with the
Infrared Array Camera (IRAC) aboard the Spitzer Space Telescope during
the General Observer program 3584 by D. Padgett. The plate scale and
field of view of IRAC are 1.2" and 5.2'x5.2', respectively. The camera
produces images with FWHM=1.6"-1.9" from 3.6 to 8.0um. The IRAC data
for Taurus were collected between 2005 February 20 and 27 (UT).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table4.dat 107 144 Previously Known Members of Taurus in Spitzer Survey
--------------------------------------------------------------------------------
See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 17 A17 --- 2MASS 2MASS name (JHHMMSSss+DDMMSSs)
19- 42 A24 --- Name Name
45- 48 F4.2 mag J-H ? 2MASS J-H colour index
50- 53 F4.2 mag H-Ks ? 2MASS H-Ks colour index
55- 59 F5.2 mag Ksmag ? 2MASS Ks magnitude
61 A1 --- l_[3.6] Limit flag on [3.6]
62- 66 F5.2 mag [3.6] ? IRAC 3.6um magnitude
68- 71 F4.2 mag e_[3.6] ? rms uncertainty on [3.6]
73 A1 --- l_[4.5] Limit flag on [3.6]
74- 78 F5.2 mag [4.5] ? IRAC 4.5um magnitude
80- 83 F4.2 mag e_[4.5] ? rms uncertainty on [4.5]
85 A1 --- l_[5.8] Limit flag on [3.6]
86- 90 F5.2 mag [5.8] ? IRAC 5.8um magnitude
92- 95 F4.2 mag e_[5.8] ? rms uncertainty on [5.8]
97 A1 --- l_[8.0] Limit flag on [3.6]
98-102 F5.2 mag [8.0] ? IRAC 8.0um magnitude
104-107 F4.2 mag e_[8.0] ? rms uncertainty on [8.0]
--------------------------------------------------------------------------------
History:
* 01-Aug-2008: From electronic version of the journal
* 16-Feb-2009: First line of table4 has been restored
(End) Patricia Vannier [CDS] 11-Jul-2008