J/AJ/121/2673 3µm survey of the Chamaeleon I dark cloud (Kenyon+, 2001)
A 3µm survey of the Chamaeleon I dark cloud.
Kenyon S.J., Gomez M.
<Astron. J. 121, 2673 (2001)>
=2001AJ....121.2673K 2001AJ....121.2673K
ADC_Keywords: Molecular clouds ; Stars, pre-main sequence ; Photometry, infrared
Keywords: infrared radiation - ISM: individual (Chamaeleon I) -
stars: formation - stars: pre-main-sequence
Abstract:
We describe an L-band photometric survey of ∼0.5deg2 of the
Chamaeleon I dark cloud. The survey has a completeness limit of
L<11.0. Our survey detects 124 sources, including all known
pre-main-sequence stars with L≤11. The fraction of sources with
near-IR excess emission is 58%±4% for K=9-11. Cha I sources have
bluer H-K and K-L colors than pre-main-sequence stars in
Taurus-Auriga. These sources also have a strong correlation between
EW(Hα and K-L. Stars with K-L≤0.6 have weak Hα emission;
stars with K-L≥0.6 have strong H{alpha]mission. Because many Cha I
sources are heavily reddened, this division between weak emission T
Tauri stars and classical T Tauri stars occurs at a redder K-L than in
Taurus-Auriga.
We acquired L-band photometry of Cha I sources and standard stars
using the South Pole Infrared Explorer (SPIREX) during the 1999
March-October observing season. The SPIREX 60cm telescope developed
by CARA for observations at the South Pole was equipped with the
NOAO/KPNO Abu infrared camera, which includes a first generation
1024x1024 InSb detector array.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 103 124 L-band observations for the Cha I sources
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- [KG2001] Cha I source number
5- 6 I2 h RAh Right Ascension (J2000)
8- 9 I2 min RAm Right Ascension (J2000)
11- 14 F4.1 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- 24 I2 arcsec DEs Declination (J2000)
26- 30 F5.2 mag Lmag ? The L-band magnitude
32 A1 --- f_Lmag [s] Indicates a saturated detection on the
SPIREX/Abu image
34- 38 F5.2 mag K-L ? The K-L color
40- 44 F5.2 mag H-K ? The H-K color
46- 49 F4.2 mag J-H ? The J-H color
51- 88 A38 --- Id Source identification
90-102 A13 --- r_Id Reference numbers, separated by comma (1)
--------------------------------------------------------------------------------
Note (1): References:
1 = Hartigan, 1993AJ....105.1511H 1993AJ....105.1511H, "Hn NN"
2 = Persi et al., 2000, Cat. J/A+A/357/219, "ISO-ChaI NNN"
3 = Feigelson et al., 1993ApJ...416..623F 1993ApJ...416..623F, "CHXR NN"
4 = Cambresy et al., 1998A&A...338..977C 1998A&A...338..977C, "[CCE98] NN"
5 = Schwartz, 1977ApJS...35..161S 1977ApJS...35..161S, "NAME Cha N"
6 = Baud et al., 1984ApJ...278L..53B 1984ApJ...278L..53B, "BYB NN"
7 = Henize & Mendoza, 1973ApJ...180..115H 1973ApJ...180..115H, "Ass CHA T 1-NN"
8 = Comeron et al., 1999A&A...343..477C 1999A&A...343..477C, "CRBR MMSS.s-MMSS"
9 = Feigelson & Kriss, 1989ApJ...338..262F 1989ApJ...338..262F, "CHX NN, CHX NNa"
10 = Glass, 1979MNRAS.187..305G 1979MNRAS.187..305G, "Glass A"
11 = Schwartz & Henize, 1983AJ.....88.1665S 1983AJ.....88.1665S
12 = Oasa et al., 1999ApJ...526..336O 1999ApJ...526..336O, "[OTS99] NN"
13 = Hyland et al., 1982MNRAS.201.1095H 1982MNRAS.201.1095H, "HJM AFF-NN"
14 = Persi et al., 1999AJ....117..439P 1999AJ....117..439P, "[PMK99] ISOCAM Cha INaN"
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 28-Sep-2001