J/AJ/135/441 VRIHα photometry in NGC 2264 (Sung+, 2008)
The initial mass function and young brown dwarf candidates in NGC 2264.
III. Photometric data.
Sung H., Bessell M.S., Chun M.-Y., Karimov R., Ibrahimov M.
<Astron. J., 135, 441-466 (2008)>
=2008AJ....135..441S 2008AJ....135..441S
ADC_Keywords: Clusters, open ; Stars, dwarfs ; Photometry, VRI ;
Photometry, H-alpha
Keywords: open clusters and associations: individual (NGC 2264) -
stars: low-mass, brown dwarfs -
stars: luminosity function, mass function
Abstract:
We have performed deep wide-field CCD photometry of the young open
cluster NGC 2264 to study the extent of star-forming regions (SFRs)
and the shape of the initial mass function. In this paper, we present
VRI and Hα photometry for more than 67,000 stars. From the
spatial distribution of the selected Hα emission stars, we
identify two active SFRs and a less active halo region surrounding
these two SFRs. There are several Hα emission stars in the field
region outside the halo region, and these may be newly formed stars in
the Mon OB1 association surrounding the cluster. The locus of
pre-main-sequence (PMS) stars in the IC versus V-IC diagram is
revised from the distribution of Hα and X-ray emission stars in
the diagram.
Description:
VRI and Hα photometry was obtained for three regions in NGC 2264
on 2002 January 6 and 7 with the CFH12K, a mosaic CCD on the CFHT.
Only long exposures were used at the CFHT due to limited observing
time. To secure the photometry of bright stars in NGC 2264, we
observed the cluster with the mosaic CCD camera WFI attached to the 1m
telescope at SSO on 2003 October 20.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 161 66066 Photometric data from CHFT observations
table8.dat 160 9000 Photometric data from SSO WFI observations
table9.dat 177 6044 Re-analysis of data from SSO 1-m telescope
and SITe 2K CCD
table12.dat 65 82 Stars below the Main Sequence ("BMS" stars)
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See also:
J/AJ/127/2659 : CHANDRA observations of NGC 2264 (Ramirez+, 2004)
J/A+A/345/521 : BVRI photometry of NGC 2264 (Flaccomio+, 1999)
J/AJ/114/2644 : UBVRIHa photometry of NGC2264 (Sung+, 1997)
J/AJ/128/1684 : NGC 2264: VRIHα photometry (Sung+, 2004)
J/AJ/129/829 : Hα emission stars in NGC 2264 (Dahm+, 2005)
J/AJ/127/1117 : Halpha emission-line stars in NGC2264 (Reipurth+, 2004)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1 A1 --- --- [C]
2- 6 I05 --- CID CHFT identification number
(Cl* NGC 2264 CID CNNNNN in Simbad)
8 I1 h RAh Hour of Right Ascension (J2000)
10- 11 I2 min RAm Minute of Right Ascension (J2000)
13- 17 F5.2 s RAs Second of Right Ascension (J2000)
18 A1 --- DE- Sign of Declination (J2000)
19- 20 I2 deg DEd Degree of Declination (J2000)
22- 23 I2 arcmin DEm Arcminute of Declination (J2000)
25- 28 F4.1 arcsec DEs Arcsecond of Declination (J2000)
30- 35 F6.3 mag Icmag Cousins I band magnitude
37- 42 F6.3 mag Rc'-Ic ? Cousins R'-I color index
44- 49 F6.3 mag Vc-Ic ? Cousins V-I color index
51- 56 F6.3 mag Rc'-Ha ? Cousins R'-Hα color index
58- 62 F5.3 mag e_Icmag Uncertainty in Icmag
64- 68 F5.3 mag e_Rc'-Ic ? Uncertainty in Rc'-Ic
70- 74 F5.3 mag e_Vc-Ic ? Uncertainty in Vc-Ic
76- 80 F5.3 mag e_Rc'-Ha ? Uncertainty in Rc'-Ha
82 I1 --- o_Icmag Number of Imag band observations
84 I1 --- o_Rc'-Ic Number of Rc'-Ic color index observations
86 I1 --- o_Vc-Ic Number of Vc-Ic color index observations
88 I1 --- o_Rc'-Ha Number of Rc'-Hα color index observations
90 A1 --- Mm Membership code (G1)
92 A1 --- D [D] Star whose PSF shows a double but
measured as a single
94- 99 F6.3 mag Jmag ? 2MASS J band magnitude
101-106 F6.3 mag Hmag ? 2MASS H band magnitude
108-113 F6.3 mag Ksmag ? 2MASS Ks band magnitude
115-119 F5.3 mag e_Jmag ? Uncertainty in Jmag
121-125 F5.3 mag e_Hmag ? Uncertainty in Hmag
127-131 F5.3 mag e_Ksmag ? Uncertainty in Ksmag
133-136 A4 --- Q2M 2MASS quality codes (G3)
138-141 I4 --- SBL97 ? Sung et al. (1997, Cat. J/AJ/114/2644)
identifier (Cl* NGC 2264 SBL NNNN in Simbad)
143-146 I4 --- PSBK ? Park et al. (2000AJ....120..894P 2000AJ....120..894P) identifier
(Cl* NGC 2264 PSB NNN in Simbad)
148-151 I4 --- SBC04 ? Sung et al. (2004, Cat. J/AJ/128/1684)
identifier ([SBC2004b] CFHT NNNN in Simbad)
153-157 F5.1 0.1nm EWHa ? Hα emission equivalent width (G2)
159-161 F3.1 --- HaInd ? Reipurth et al. (2004, Cat. J/AJ/127/1117)
Hα emission index
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Byte-by-byte Description of file: table8.dat
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Bytes Format Units Label Explanations
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1 A1 --- --- [W]
2- 5 I04 --- WID WFI identification number
(Cl* NGC 2264 WID WNNNN in Simbad)
8 I1 h RAh Hour of Right Ascension (J2000)
10- 11 I2 min RAm Minute of Right Ascension (J2000)
13- 17 F5.2 s RAs Second of Right Ascension (J2000)
18 A1 --- DE- Sign of Declination (J2000)
19- 20 I2 deg DEd Degree of Declination (J2000)
22- 23 I2 arcmin DEm Arcminute of Declination (J2000)
25- 28 F4.1 arcsec DEs Arcsecond of Declination (J2000)
30- 35 F6.3 mag Icmag Cousins I band magnitude
37- 42 F6.3 mag V-Ic ? Johnson-Cousins V-I color index
44- 49 F6.3 mag Rc-Ic ? Cousins R-I color index
51- 56 F6.3 mag B-V ? Johnson B-V color index
58- 63 F6.3 mag Rc-Ha ? Cousins R-Hα color index
65- 69 F5.3 mag e_Icmag Uncertainty in Icmag
71- 75 F5.3 mag e_V-Ic ? Uncertainty in V-Ic
77- 81 F5.3 mag e_Rc-Ic ? Uncertainty in Rc-Ic
83- 87 F5.3 mag e_B-V ? Uncertainty in B-V
89- 93 F5.3 mag e_Rc-Ha ? Uncertainty in Rc-Ha
95 I1 --- o_Icmag Number of Icmag observations
97 I1 --- o_V-Ic Number of V-Ic color index observations
99 I1 --- o_Rc-Ic Number of Rc-Ic color index observations
101 I1 --- o_B-V Number of B-V color index observations
103 I1 --- o_Rc-Ha Number of Rc-Ha color index observations
105 A1 --- Mm Membership code (G1)
107 A1 --- D [D] Star whose PSF shows a double but measured
as a single or 2 stars in Tables 3 or 9
109-114 F6.3 mag Jmag ? 2MASS J band magnitude
116-121 F6.3 mag Hmag ? 2MASS H band magnitude
123-128 F6.3 mag Ksmag ? 2MASS Ks band magnitude
130-134 F5.3 mag e_Jmag ? Uncertainty in Jmag
136-140 F5.3 mag e_Hmag ? Uncertainty in Hmag
142-146 F5.3 mag e_Ksmag ? Uncertainty in Ksmag
148-151 A4 --- Q2M 2MASS quality codes (G3)
152-156 F5.1 0.1nm EWHa ? Hα emission equivalent width (G2)
158-160 F3.1 --- HaInd ? Reipurth et al. (2004, Cat. J/AJ/127/1117))
Hα emission index
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Byte-by-byte Description of file: table9.dat
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Bytes Format Units Label Explanations
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1 A1 --- --- [S]
2- 5 I04 --- SID SSO SITe 2k identification number
(Cl* NGC 2264 SID SNNNN in Simbad)
7 I1 h RAh Hour of Right Ascension (J2000)
9- 10 I2 min RAm Minute of Right Ascension (J2000)
12- 16 F5.2 s RAs Second of Right Ascension (J2000)
17 A1 --- DE- Sign of Declination (J2000)
18- 19 I2 deg DEd Degree of Declination (J2000)
21- 22 I2 arcmin DEm Arcminute of Declination (J2000)
24- 27 F4.1 arcsec DEs Arcsecond of Declination (J2000)
29- 34 F6.3 mag Vmag ? Johnson V band magnitude
36- 41 F6.3 mag Icmag ? Cousins I band magnitude
43- 48 F6.3 mag Rc-Ic ? Cousins R-I color index
50- 55 F6.3 mag V-Ic ? Johnson-Cousins V-I color index
57- 62 F6.3 mag B-V ? Johnson (B-V) color index
64- 69 F6.3 mag U-B ? Johnson (U-B) color index
71- 75 F5.3 mag e_Vmag ? Uncertainty in Vmag
77- 81 F5.3 mag e_Icmag ? Uncertainty in Icmag
83- 87 F5.3 mag e_Rc-Ic ? Uncertainty in Rc-Ic
89- 93 F5.3 mag e_V-Ic ? Uncertainty in V-Ic
95- 99 F5.3 mag e_B-V ? Uncertainty in B-V
101-105 F5.3 mag e_U-B ? Uncertainty in U-B
107-108 I2 --- o_Vmag Number of Vmag observations
110 I1 --- o_Icmag Number of Icmag observations
112 I1 --- o_Rc-Ic Number of Rc-Ic index observations
114 I1 --- o_V-Ic Number of V-Ic index observations
116-117 I2 --- o_B-V Number of B-V index observations
119-120 I2 --- o_U-B Number of U-B index observations
122 A1 --- Mm Membership code (G1)
124 A1 --- D [DdT] Duplication flag (1)
126-131 F6.3 mag Jmag ? 2MASS J band magnitude
133-138 F6.3 mag Hmag ? 2MASS H band magnitude
140-145 F6.3 mag Ksmag ? 2MASS Ks band magnitude
147-151 F5.3 mag e_Jmag ? Uncertainty in Jmag
153-157 F5.3 mag e_Hmag ? Uncertainty in Hmag
159-163 F5.3 mag e_Ksmag ? Uncertainty in Ksmag
165-167 A3 --- Q2M 2MASS quality codes (G3)
169-173 F5.1 0.1nm EWHa ? Hα emission equivalent width (G2)
175-177 F3.1 --- HaInd ? Reipurth et al. (2004, Cat. J/AJ/127/1117)
Hα emission index
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Note (1): Duplication flag, defined as follows:
D = Star whose PSF shows a double but measured as a single or 2 stars in
Table 3;
d = probably two stars in Table 3;
T = three stars in Table 3.
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Byte-by-byte Description of file: table12.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- ID CHFT identification number (CNNNNNN, SNNNN, WNNN)
8 I1 h RAh Hour of Right Ascension (J2000)
10- 11 I2 min RAm Minute of Right Ascension (J2000)
13- 17 F5.2 s RAs Second of Right Ascension (J2000)
18 A1 --- DE- Sign of Declination (J2000)
19- 20 I2 deg DEd Degree of Declination (J2000)
22- 23 I2 arcmin DEm Arcminute of Declination (J2000)
25- 28 F4.1 arcsec DEs Arcsecond of Declination (J2000)
30- 35 F6.3 mag Icmag Cousins I band magnitude
37- 41 F5.3 mag Rc'-Ic Cousins R'-I color index
43- 47 F5.3 mag V-Ic ?=- Johnson-Cousins V-I color index
49- 54 F6.3 mag Rc'-Ha ?=- Cousins R'-Hα color index
56 A1 --- Mm Membership code (G1)
58- 60 F3.1 mag dIcP Magnitude difference from the lower envelope
of the PMS locus
62- 65 F4.1 mag dIcZ ?=- Magnitude difference from the ZAMS line
at the distance of NGC 2264
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Global Notes:
Note (G1): Membership related code, defined as follows:
H = Hα emission star;
h = Hα emission candidate;
X = X-ray emission star;
x = X-ray emission candidate;
+ = Hα emission star with X-ray emission, i.e. "+" = "H" + "X";
- = Hα emission candidate with X-ray emission, i.e. "-" = "X" + "h";
E = strong Hα emission star from spectroscopy (EWHa≥10Å
in Dahm & Simon (2005, Cat. J/AJ/129/829) or Hα index ≥2.5 in
Reipurth et al. (2004, Cat. J/AJ/127/1117));
e = weak Hα emission star from spectroscopy (EWHa<10Å in
Dahm & Simon (2005, Cat. J/AJ/129/829) or Hα index ≤2 in
Reipurth et al. (2004, Cat. J/AJ/127/1117));
M = X-ray emission star with membership class "e", i.e. "M" = "e" + "X";
P = X-ray emission star with membership class "E", i.e. "P" = "E" + "X";
m = X-ray candidate with membership class "e", i.e. "m" = "e" + "x"
p = X-ray candidate with membership class "E", i.e. "p" = "E" + "x".
Note (G2): Taken from Dahm & Simon (2005, Cat. J/AJ/129/829) and
in units of Angstroms.
Note (G3): See the 2MASS catalog (II/246) for the qualities, one per
(JHK) band (ABCD=reliable; EF=unreliable; U=upper limit). When
two or three stars were identified as the optical counterpart of
one 2MASS object, this column contains:
* "2MD" or "2MT" when the magnitude difference is less than 2mag;
the 2MASS magnitudes are then not listed.
* "2Md" or "2Mt" when the magnitude difference is greater than 2mag;
the 2MASS magnitudes are assigned to the brighter star.
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History:
From electronic version of the journal
References:
Sung et al., Paper I 2004AJ....128.1684S 2004AJ....128.1684S, Cat. J/AJ/128/1684
Sung et al., Paper II 2007ASPC..362..275S 2007ASPC..362..275S
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 13-Nov-2009