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J/AJ/124/1001     JHKs photometry of Cha I variables          (Carpenter, 2002)

Near-infrared photometric variability of stars toward the Chamaeleon I molecular cloud. Carpenter J.M., Hillenbrand L.A., Skrutskie M.F., Meyer M.R. <Astron. J. 124, 1001 (2002)> =2002AJ....124.1001C
ADC_Keywords: Clusters, open ; Stars, variable ; Stars, pre-main sequence ; Photometry, infrared Keywords: infrared radiation - open clusters and associations: general - stars: pre-main-sequence - stars: variables: general Abstract: We present the results of a J, H, and Ks photometric monitoring campaign of a 0.72°x6° area centered on the Chamaeleon I star-forming region. Data were obtained on 15 separate nights over a 4 month time interval, from January to May 2000, using the Two Micron All Sky Survey south telescope. Out of a total of 34,539 sources brighter than the photometric completeness limits (J=16.0, H=15.2, and Ks=14.8), 95 exhibit near-infrared variability in one or more bands. The variables can be grouped into a population of bright, red objects that are associated with the Chamaeleon I association and a population of faint, blue variables that are dispersed over the full 6° of the survey and are likely field stars or older pre-main-sequence stars unrelated to the present-day Chamaeleon I molecular cloud. Ten new candidate members of Chamaeleon I, including eight brown dwarf candidates, have been identified based on variability and/or near-infrared-excess emission in the J-H versus H-Ks color-color diagram. We also provide a compendium of astrometry and J, H, and Ks photometry for previously identified members and candidate members of Chamaeleon I. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 99 95 Near-infrared variable stars table4.dat 82 10 New candidate members of Chamaeleon I table5.dat 101 196 Near-infrared photometry for previously identified Chamaeleon I members table6.dat 186 196 Cross identification of Chamaeleon I members
See also: J/AJ/121/974 : JHK photometry in Cha I (Gomez+, 2001) J/AJ/121/2673 : 3µm survey of the Chamaeleon I dark cloud (Kenyon+, 2001) J/A+A/357/219 : ISOCAM observations in Cha I. (Persi+, 2000) J/ApJ/445/280 : ROSAT survey of the Orion nebula region (Gagne+ 1995) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 5 I5 --- CHSM Identification number 7- 22 A16 --- Name Previously identified variable star name 24- 33 F10.6 deg RAdeg Right Ascension in decimal degrees (J2000) 35- 44 F10.6 deg DEdeg Declination in decimal degrees (J2000) 46- 51 F6.3 mag Jmag ? The mean J-band magnitude 53- 58 F6.3 mag Hmag The mean H-band magnitude 60- 65 F6.3 mag Ksmag The mean Ks band magnitude 67- 71 F5.3 mag e_Jmag ? Observed photometric rms of Jmag 73- 77 F5.3 mag e_Hmag Observed photometric rms of Hmag 79- 83 F5.3 mag e_Ksmag Observed photometric rms of Ksmag 85- 86 I2 --- o_Jmag Number of quality photometric measurements in Jmag 88- 89 I2 --- o_Hmag Number of quality photometric measurements in Hmag 91- 92 I2 --- o_Ksmag Number of quality photometric measurements in Ksmag 94- 98 F5.2 --- VI Stetson variability index
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 5 I5 --- CHSM Sequential number 7- 16 F10.6 deg RAdeg Right ascension in decimal degrees (J2000.0) 18- 27 F10.6 deg DEdeg Declination in decimal degrees (J2000.0) 29- 34 F6.3 mag Jmag Mean J magnitude 36- 41 F6.3 mag Hmag Mean H magnitude 43- 48 F6.3 mag Ksmag Mean Ks magnitude 50- 54 F5.3 mag e_Jmag Observed rms uncertainty on Jmag 56- 60 F5.3 mag e_Hmag Observed rms uncertainty on Hmag 62- 66 F5.3 mag e_Ksmag Observed rms uncertainty on Ksmag 68- 70 A3 --- Var [Yes] Variable ? 72- 74 A3 --- Excess [Yes] JHKs excess ? 76- 82 A7 --- Name Other name
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 15 A15 --- Name Commonly adopted name of the Chamaeleon I member 17- 18 I2 h RAh Hour of Right Ascension (J2000) (1) 20- 21 I2 min RAm Minute of Right Ascension (J2000) (1) 23- 27 F5.2 s RAs Second of Right Ascension (J2000) (1) 29 A1 --- DE- Sign of the Declination (J2000)(1) 30- 31 I2 deg DEd Degree of Declination (J2000) (1) 33- 34 I2 arcmin DEm Arcminute of Declination (J2000) (1) 36- 39 F4.1 arcsec DEs Arcsecond of Declination (J2000) (1) 41- 46 F6.3 mag Jmag ? The mean J-band magnitude (2) 48- 53 F6.3 mag Hmag ? The mean H-band magnitude (2) 55- 60 F6.3 mag Ksmag ? The mean K_s_ band magnitude (2) 62- 66 F5.3 mag e_Jmag ? Observed photometric rms of Jmag 68- 72 F5.3 mag e_Hmag ? Observed photometric rms of Hmag 74- 78 F5.3 mag e_Ksmag ? Observed photometric rms of Ksmag 80- 81 I2 --- o_Jmag ? Number of quality photometric measurements in Jmag 83- 84 I2 --- o_Hmag ? Number of quality photometric measurements in Hmag 86- 87 I2 --- o_Ksmag ? Number of quality photometric measurements in Ksmag 89- 93 F5.2 --- VI ? Stetson variability index 95 A1 --- YSOP1 [0Y] Variable identified from this study or General Catalogue of Variable Stars (3) 96 A1 --- YSOP2 [0Y] Contains Halpha, Pabeta, or Brγ in emission (3) 97 A1 --- YSOP3 [0Y?] Contains lithium in absorption (3) 98 A1 --- YSOP4 [0Y] X-ray source (3) 99 A1 --- YSOP5 [0Y] Contains an infrared excess (3) 100 A1 --- YSOP6 [0Y] Far-infrared source (3)
Note (1): See text for details on where the coordinates were obtained. Note (2): For sources with J, H, and Ks photometry, o_Jmag, o_Hmag, and o_Ksmag=1 in all three bands, but otherwise no tabulated Stetson index, the photometry is from the Version 2 processing of the 2MASS Working Database and the rms represents the photometric uncertainty from the 2MASS processing pipeline. Note (3): Flags: Y = Indicates the characteristic has been identified with that star in at least one study. ? = Indicates that the authors of the original paper expressed uncertainty of the detection. 0 = Indicates the property has not yet been identified.
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 15 A15 --- Name Name (one of the following designation) 17- 21 I5 --- CHSM ? Identification number from this study 23- 30 A8 --- [CCE98] Cambresy et al., 1998A&A...338..977C (1) 32- 38 A7 --- GCVS General Catalog of Variable Stars (II/214), see Lopez & Girard, 1990PASP..102.1018L 40- 44 A5 --- W87 Whittet et al., 1991MNRAS.249..319W 46- 51 A6 --- Sz Schwartz, 1977ApJS...35..161S (Sz NN) 53- 58 A6 --- S Hoffmeister, 1963VeSon...6....1H (SNNNN) 60- 66 A7 --- HM Henize & Mendoza, 1973ApJ...180..115H (HM NN) (2) 68- 76 A9 --- CHXR Feigelson et al., 1993ApJ...416..623F (CHXR NNA) 78- 84 A7 --- CHX Feigelson & Kriss, 1989ApJ...338..262F (CHX NNA) 86- 92 A7 --- Hn Hartigan, 1993AJ....105.1511H (Hn NNA) 93- 97 A5 --- HJM Hyland et al., 1982MNRAS.201.1095H and Jones et al., 1985AJ.....90.1191J (CN-NN, EN-NNA) (3) 99-105 A7 --- HBC Herbig Bell (1988, Cat. V/73 Catalog (HBC NNN) 107-113 A7 --- P00 Persi et al., 2000, <J/A+A/357/219> (ISO NNN) (4) 114-120 A7 --- KG2001 Kenyon & Gomez, 2001, <J/AJ/121/2673> (KG NNN) (5) 123-128 A6 --- GK2001 Gomez & Kenyon, 2001, <J/AJ/121/974> (GK NN) (6) 130-136 A7 --- OTS99 Oasa et al., 1999ApJ...526..336O (OTS NN) (7) 138-142 A5 --- B84 Baud et al., 1984ApJ...278L..53B (BNNA) (8) 144-153 A10 --- IRAS IRAS designation (HHMMm-DDMM) 155-186 A32 --- Other Other names
Note (1): Cam1 from table1 and Cam2 from table2, [CCE98] NN in Simbad Note (2): Ass CHA T 1-NN in Simbad Note (3): HJM AFF-NN and HJM AF-NN in Simbad Note (4): ISO-ChaI NNN in Simbad Note (5): [KG2001] NNN in Simbad Note (6): [GK2001] NNN in Simbad Note (7): [OTS99] NN in Simbad Note (8): BYB NN in Simbad
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 27-Sep-2002
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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