J/AJ/127/2228 VRI photometry of PMS stars in NGC 2264 OB (Makidon+, 2004)
Periodic variability of pre-main-sequence stars in the NGC 2264 OB association.
Makidon R.B., Rebull L.M., Strom S.E., Adams M.T., Patten B.M.
<Astron. J., 127, 2228-2245 (2004)>
=2004AJ....127.2228M 2004AJ....127.2228M
ADC_Keywords: Clusters, open ; Stars, pre-main sequence ; Photometry, UBVRI
Keywords: open clusters and associations: individual (NGC 2264) -
stars: late-type - stars: pre-main-sequence - stars: rotation
Abstract:
We summarize the results of an observing campaign to identify periodic
pre-main-sequence (PMS) variables in the NGC 2264 OB association. We
find 201 periodic candidates.
Description:
We present here the 201 periodic variables extracted from time series
(monitoring) data obtained for 4974 stars in a region roughly centered
on the B3 V star HD 47777
(ICRS 2000.0 coordinates RA=06 40 42.29, DE=+09 38 53,55).
We obtained a series of I-band CCD images with the Prime Focus
Corrector (PFC) at the McDonald Observatory 0.76 m telescope. The PFC
is equipped with a standard Bessell UBVRI filter set and a
Loral-Fairchild 2048x2048 CCD at prime focus. We observed the field
an average of five times each night over a total of 23 separate
nights (1996 Oct 24-30, 1996 Nov 24-Dec 02 and 1997 Jan 22-Feb 03).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 67 201 Periodic Candidates in NGC 2264
table4.dat 71 42 Comparison with Kearns & Herbst,
1998AJ....116..261K 1998AJ....116..261K (KH98)
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See also:
J/AJ/123/1528 : UBV(RI)C and JHK photometry in NGC 2264 (Rebull+, 2002)
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 Candidate designation, numbering from Rebull et
al., 2002, Cat. J/AJ/123/1528,
Cl* NGC 2264 RMS NNNN in Simbad
6- 7 I2 h RAh Hour of right ascension (J2000)
9- 10 I2 min RAm Minute of right ascension (J2000)
12- 15 F4.1 s RAs Second of right ascension (J2000)
17 A1 --- DE- Sign of the 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- 33 F5.2 mag Imag The Bessell I-band magnitude
35- 38 F4.2 mag R-I ? The Bessell (R-I) color
40- 43 F4.2 mag V-I ? The Bessell (V-I) color
45- 49 F5.2 d Per Period
51 I1 --- q_Per Period quality (2)
53 A1 --- f_Per [e] Star in regions defined in Table 2 (3)
55- 58 A4 --- SpType MK spectral type
60 I1 --- OnCld [0/1] Object superposed on the molecular cloud
behind the visible NGC 2264 cluster
62 I1 --- InLoc [0/1]? Object appears in the well-defined locus
of stars found above the ZAMS
64 I1 --- VIType [0/1] Object has V and I photometry and
good-quality spectral types (4)
66 I1 --- VIK5-M2 [0/1] Object has V and I photometry and
good-quality spectral types, and in the
type range K5-M2 (4)
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Note (2): Period quality takes the following values:
1 = Highest-quality sample, obtained with FAP levels set by a
correlation timescale of 1 day (as in Rebull et al., 2001,
Cat. J/AJ/121/1676)
2 = Likely periods, obtained via a correlation timescale of 0.5 days
or added manually based on the quality of the light curve
Note (3):
e = These stars fall in the regions defined in Table 2.
Stars 164, 2537, and 3051 have a high enough normalized power to be
considered periodic even with the higher 1% FAP limit set with the 1
day correlation timescale; see text.
Note (4): stars with VIType=1 were used in Rebull et al., 2002AJ....124..546R 2002AJ....124..546R
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- RMS Star identification number, from Rebull et al.
(2002, Cat. J/AJ/123/1528),
Cl* NGC 2264 RMS NNNN in Simbad
6- 10 F5.2 d Per ? Period from this study
12- 13 I2 h RAh Right ascension (J2000)
15- 16 I2 min RAm Right ascension (J2000)
18- 21 F4.1 s RAs Right ascension (J2000)
23 A1 --- DE- Declination sign (J2000)
24- 25 I2 deg DEd Declination (J2000)
27- 28 I2 arcmin DEm Declination (J2000)
30- 33 F4.1 arcsec DEs Declination (J2000)
35- 37 A3 --- KH98 Kearns & Herbst, 1998AJ....116..261K 1998AJ....116..261K, name,
Cl* NGC 2264 VVO NNA in Simbad
39- 43 F5.2 d PerKH98 ? Period from KH98 (1998AJ....116..261K 1998AJ....116..261K)
45- 74 A30 --- Notes Notes
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 08-Jul-2004