J/AJ/121/3160 JHK photometry near the Trapezium region (Carpenter+, 2001)
Near-infrared photometric variability of stars toward the
Orion A molecular cloud.
Carpenter J.M., Hillenbrand L.A., Skrutskie M.F.
<Astron. J. 121, 3160 (2001)>
=2001AJ....121.3160C 2001AJ....121.3160C
ADC_Keywords: Stars, variable ; Stars, pre-main sequence ; Photometry, infrared
Keywords: infrared radiation - stars: individual (YY Orionis, BM Orionis) -
stars: pre-main-sequence - stars: variables: general
Abstract:
We present an analysis of J, H, and Ks time-series photometry obtained
with the southern 2MASS telescope over a 0.84°x6° region
centered near the Trapezium region of the Orion Nebula cluster. These
data are used to establish the near-infrared variability properties of
premain-sequence stars in Orion on timescales of ∼1-36days, ∼2 months,
and ∼2 years. A total of 1235 near-infrared variable stars are
identified, ∼93% of which are likely associated with the Orion A
molecular cloud.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 87 1235 Near-Infrared Variable Stars
table7.dat 42 233 Periodic Stars
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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- 5 I5 --- [CHS2001] Star identification number
7- 15 F9.6 deg RAdeg Right ascension in decimal degrees (J2000)
17- 25 F9.6 deg DEdeg Declination in decimal degrees (J2000)
27- 32 F6.3 mag Jmag ? The average J magnitude
34- 39 F6.3 mag Hmag The average H magnitude
41- 46 F6.3 mag Kmag The average Ks magnitude
48- 52 F5.3 mag e_Jmag ? Observed rms in Jmag
54- 58 F5.3 mag e_Hmag ? Observed rms in Hmag
60- 64 F5.3 mag e_Kmag ? Observed rms in Kmag
66- 67 I2 --- o_Jmag Number of high-quality Jmag photometric
measurements used to assess the variability
69- 70 I2 --- o_Hmag Number of high-quality Hmag photometric
measurements used to assess the variability
72- 73 I2 --- o_Kmag Number of high-quality Kmag photometric
measurements used to assess the variability
75- 79 F5.2 --- Index Stetson variability index
81 I1 --- Flag1 [0/1] Variable on 16 nights common to entire
area (1)
82 I1 --- Flag2 [0/1] Variable in March-April 2000 data (1)
83 I1 --- Flag3 [0/1] Long-term variability in 2000 February
and/or 1998 March (1)
84 I1 --- Flag4 [0/1] Periodic variable (1)
85 I1 --- Flag5 [0/1] Eclipsing candidate (1)
86 I1 --- Flag6 [0/1] Selected as variable from subjective
inspection of light curve (1)
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Note (1):
1 = star exhibits this type of variability;
0 = star does not exhibits this type of variability.
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- [CHS2001] Star identification number
7- 11 F5.2 d PerJ ? The J band period
13- 17 F5.2 d PerH The H band period
19- 23 F5.2 d PerK The Ks band period
25 A1 --- l_FAPJ Limit flag on FAPJ
26- 29 F4.2 --- FAPJ ? The J band false-alarm probability (FAP)
that the power spectrum peak could have
resulted from random noise
31 A1 --- l_FAPH Limit flag on FAPH
32- 35 F4.2 --- FAPH The H band false-alarm probability (FAP) that
the power spectrum peak could have resulted
from random noise
37 A1 --- l_FAPK Limit flag on FAPK
38- 41 F4.2 --- FAPK The Ks band false-alarm probability (FAP)
that the power spectrum peak could have
resulted from random noise
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 27-Sep-2001