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 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:
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FileName Lrecl Records Explanations
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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
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See also:
J/A+A/345/521 : BVRI photometry of NGC 2264 (Flaccomio+, 1999)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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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
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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).
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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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
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Note (1): Good to at least ∼2".
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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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 Hα 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
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Note (1): A blank indicates no data.
Note (2): A negative value indicates absorption. A blank indicates no data.
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Global notes:
Note (G1): Cl* NGC 2264 RMS NNNN in Simbad
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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