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J/AJ/123/1528       UBV(RI)C and JHK photometry in NGC 2264    (Rebull+, 2002)

Circumstellar disk candidates identified in NGC 2264. Rebull L.M., Makidon R.B., Strom S.E., Hillenbrand L.A., Birmingham A., Patten B.M., Jones B.F., Yagi H., Adams M.T. <Astron. J. 123, 1528 (2002)> =2002AJ....123.1528R
ADC_Keywords: Clusters, open ; Photometry, UBVRI ; Photometry, infrared ; Photometry, H-alpha Keywords: open clusters and associations: individual (NGC 2264) - stars: pre-main-sequence Abstract: We present an optical and near-infrared study of a 45'x45' field in NGC 2264, which includes both S Mon and the Cone Nebula. We report photometry at optical (UBVRCIC) and near-infrared (JHK) wavelengths for ∼600 stars and spectroscopic classifications for ∼400 of these stars. We identify circumstellar disk candidates using three techniques: excess ultraviolet (U-V) emission, excess near-IR (I-K and H-K) emission, and Hα emission-line equivalent widths for those stars with spectra. We find generally good correlation between disk indicators thought to originate from different physical processes. We find little if any evolution of disk fraction with stellar age or mass. However, when we derive mass accretion rates (dM/dt) from the excess emission at U, we find that dM/dt decreases with age over the age range spanned by our data, ∼0.15 Myr, and increases with mass over the range ∼0.25-1M. These findings are comparable to results found previously by us in the Orion Nebula cluster flanking fields. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 161 687 Observation I: Observations of the On-Cloud and In-Locus Stars table2.dat 39 150 Observations II: Spectral Types of Off-Cloud or Not-in-Locus Stars table3.dat 60 211 Observations III: Derived Parameters for On-Cloud and In-Locus Stars with Spectra
See also: J/A+A/345/521 : BVRI photometry of NGC 2264 (Flaccomio+, 1999) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 4 I4 --- RMS Star number (G1) 7- 8 I2 h RAh Hour of Right Ascension (J2000) (1) 10- 11 I2 min RAm Minute of Right Ascension (J2000) (1) 13- 16 F4.1 s RAs Second of Right Ascension (J2000) (1) 19 A1 --- DE- Sign of the Declination (J2000) (1) 20- 21 I2 deg DEd Degree of Declination (J2000) (1) 23- 24 I2 arcmin DEm Arcminute of Declination (J2000) (1) 26- 29 F4.1 arcsec DEs Arcsecond of Declination (J2000) (1) 32- 36 F5.2 mag Imag The Ic band magnitude 39- 43 F5.2 mag e_Imag The error in Imag 46- 50 F5.2 mag U-B ? The (U-B) color 53- 57 F5.2 mag e_U-B ? The error in U-B 60- 64 F5.2 mag B-V ? The (B-V) color 67- 71 F5.2 mag e_B-V ? The error in B-V 74- 78 F5.2 mag V-Rc ? The (V-Rc) color 81- 85 F5.2 mag e_V-Rc ? The error in V-Rc 88- 92 F5.2 mag R-Ic ? The (Rc-Ic) color 95- 99 F5.2 mag e_R-Ic ? The error in R-Ic 102-106 F5.2 mag I-K ? The (Ic-K) color 109-113 F5.2 mag e_I-K ? The error in I-K 116-120 F5.2 mag J-K ? The (J-K) color 123-127 F5.2 mag e_J-K ? The error in J-K 130-134 F5.2 mag H-K ? The (H-K) color 137-141 F5.2 mag e_H-K ? The error in H-K 144-147 A4 --- SpType Spectral type 150-154 F5.2 mag AIc ? The Ic band extinction 157-161 F5.2 mag AV ? The V band extinction
Note (1): Good to at least ∼1", except for stars detected only in JHK, where coordinates are limited by the registration of the various individual SQIID frames to be ∼2" (see text).
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 4 I4 --- RMS Star number (G1) 7- 8 I2 h RAh Hour of Right Ascension (J2000) (1) 10- 11 I2 min RAm Minute of Right Ascension (J2000) (1) 13- 16 F4.1 s RAs Second of Right Ascension (J2000) (1) 19 A1 --- DE- Sign of the Declination (J2000) (1) 20- 21 I2 deg DEd Degree of Declination (J2000) (1) 23- 24 I2 arcmin DEm Arcminute of Declination (J2000) (1) 26- 29 F4.1 arcsec DEs Arcsecond of Declination (J2000) (1) 36- 39 A4 --- SpType Spectral type
Note (1): Good to at least ∼2".
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 4 I4 --- RMS Star number (G1) 7- 11 F5.2 mag UVEx ? The (U-V) excess (1) 14- 18 F5.2 mag IKEx ? The (I-K) excess (1) 21- 25 F5.2 mag HKEx ? The (H-K) excess (1) 28- 33 F6.2 0.1nm EWHalpha ? The Halpha equivalent width in Angstroms (2) 37- 40 F4.2 solMass Mass ? Derived mass in solar masses (1) 45- 48 F4.1 [yr] Age Log of the derived age 50- 54 F5.2 solRad Radius ? Derived radius in solar radii (1) 56- 60 F5.2 [solMass/yr] MLoss ? Log of the derived mass accretion rate
Note (1): A blank indicates no data. Note (2): A negative value indicates absorption. A blank indicates no data.
Global notes: Note (G1): Cl* NGC 2264 RMS NNNN in Simbad
History: * 21-Mar-2003: From electronic version of the journal * 16-Feb-2009: In table1, colour K-H was a misprint for H-K. In original paper, column K of table1 is likely a misprint for I-K.
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 13-May-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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