J/AJ/121/974 JHK photometry in Cha I (Gomez+, 2001)
A near-infrared imaging survey of the Chamaeleon I dark cloud.
Gomez M., Kenyon S.J.
<Astron. J. 121, 974 (2001)>
=2001AJ....121..974G 2001AJ....121..974G
ADC_Keywords: Molecular clouds ; Photometry, infrared ; Stars, pre-main sequence
Keywords: dust, extinction - ISM: individual (Chamaeleon I) - stars: formation -
stars: low-mass, brown dwarfs - stars: pre-main-sequence
Abstract:
We describe a near-infrared imaging survey covering ∼1deg2 of the
Chamaeleon I dark cloud. The survey is complete for K<15.0, H<16.0,
and J<16.5, roughly 2 magnitudes more sensitive than previous
large-scale surveys. We use the large number of background stars
detected to derive an accurate near-infrared extinction law for the
cloud and select new candidate members with near-infrared color
excesses. We list ∼100 candidates of the cloud with K≥2.0, based on
their positions in the J-H, H-K color-color diagram. These new stars
have low luminosities (K∼12-16, H-K≳0.5-1.5) and may have masses
close to or even below the hydrogen-burning limit.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table3.dat 57 56 Candidate pre-main-sequence stars with K<14.0
table4.dat 57 62 Candidate pre-main-sequence stars with K>14.0
--------------------------------------------------------------------------------
See also:
J/A+A/357/219 : ISOCAM observations in Cha I. (Persi+, 2000)
Byte-by-byte Description of file: table3.dat table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- [GK2001] Star number
5 A1 --- f_[GK2001] [a] Indicates star has a fuzzy K image
7- 8 I2 h RAh Right Ascension (J2000)
10- 11 I2 min RAm Right Ascension (J2000)
13- 16 F4.1 s RAs Right Ascension (J2000)
18 A1 --- DE- Sign of the Declination (J2000)
19- 20 I2 deg DEd Declination (J2000)
22- 23 I2 arcmin DEm Declination (J2000)
25- 26 I2 arcsec DEs Declination (J2000)
28- 32 F5.2 mag Kmag K band magnitude
34- 37 F4.2 mag H-K The (H-K) color
39- 42 F4.2 mag J-H The (J-H) color
44- 55 A12 --- ID Identification
57 I1 --- r_ID ? References on ID (1)
--------------------------------------------------------------------------------
Note (1): References:
1 = Persi et al., 2000, Cat. J/A+A/357/219, ISO-ChaI NNN
2 = Oasa et al. (1999ApJ...526..336O 1999ApJ...526..336O), NIR-NN (= [OTS99] NN in Simbad)
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 24-Apr-2001