J/A+A/553/A48 Near-infrared variability in RCW 38 (Doerr+, 2013)
Near-infrared variability in the star-forming region RCW 38.
Doerr M., Chini R., Haas M., Lemke R., Nuernberger D.
<Astron. Astrophys. 553, A48 (2013)>
=2013A&A...553A..48D 2013A&A...553A..48D
ADC_Keywords: Clusters, open ; H II regions ; Stars, variable ; YSOs ;
Photometry, infrared
Keywords: stars; formation - stars: pre-main sequence -
stars: variables: T Tauri, Herbig Ae/Be - stars: early-type -
stars: late-type - open clusters and associations: individual: RCW 38
Abstract:
We want to study the content of young stellar objects in the RCW 38
cluster by means of multi-epoch variability studies.
We performed a three-month near-infrared (NIR) monitoring campaign of
the young cluster RCW 38 using the 80cm IRIS telescope near Cerro
Armazones, Chile. Variability data with a median sampling of 1 day was
gathered for 1026 sources, while a total of 3433 sources in JHK could
be studied in the co-added, deep images with a completeness limit of
K<15mag.
Description:
Observations were carried out using the 80cm IRIS telescope of the
Universitaetssternwarte Bochum near Cerro Armazones, Chile at an
altitude of 2817m. The monitoring campaign was scheduled from January
to March 2011.
Objects:
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RA (2000) DE Designation(s)
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08 59 47.2 -47 31 57 RCW 38 = GAL 268.0-01.1
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 79 139 NIR photometry of NIR variable sources in the
star forming region RCW 38
table2.dat 40 5699 Daily H and Ks photometry for all NIR variable
sources in RCW 38
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See also:
J/AJ/132/1100 : X-ray and IR sources in RCW 38 (Wolk+, 2006)
J/AJ/138/33 : VLT JHKs imaging of RCW 38 (Derose+, 2009)
J/ApJ/743/166 : Star-forming cluster RCW 38 (Winston+, 2011)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- ID [23/1652] Identification number
6- 7 I2 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)
18 A1 --- DE- Sign of the 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- 34 F5.2 mag Jmag ? J magnitude
36- 39 F4.2 mag e_Jmag ? Uncertainty in Jmag
41- 45 F5.2 mag Hmag H magnitude
47- 50 F4.2 mag e_Hmag Uncertainty in Hmag
52- 56 F5.2 mag Ksmag Ks magnitude
58- 61 F4.2 mag e_Ksmag Uncertainty in Ksmag
63- 65 F3.1 mag Amp Amplitude of variability
67 A1 --- Var [ipl] NIR variability behaviour (1)
69- 71 A3 --- MIRcl Mid-IR YSO classification (2),(3)
73- 75 A3 --- X/MIRv [X,v ] Xray emission / MIR variability (2),(4)
77- 79 I3 --- X-ID ? Cross-ID with Winston et al. 2011 (2)
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Note (1): NIR variability behaviour flag as follows:
i = irregular
p = periodic
l = long term
Note (2): From Winston et al. (2011, Cat. J/ApJ/743/166).
Note (3): MIR YSO classification:
0/I,II,III = T Tau classes
FS = flat-spectrum T Tauri.
Note (4): Xray emission / MIR variability flag:
X = X-ray emission
v = long-term MIR variation
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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 --- ID [23/1652] Identification number
6- 14 F9.3 --- MJD Observing epoch (MJD) (1)
16- 21 F6.3 mag Hmag ? H magnitude
23- 27 F5.3 mag e_Hmag ? Uncertainty in Hmag
29- 34 F6.3 mag Ksmag ? Ks magnitude
36- 40 F5.3 mag e_Ksmag ? Uncertainty in Ksmag
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Note (1): Epochs (MJD) of a single night with both H and Ks observations
differ by less than 2 hours, hence the average MJD is listed.
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Acknowledgements:
Dieter E.A. Nuernberger, dnuernberger(at)astro.ruhr-uni-bochum.de
(End) D. Nuernberger [AIRUB, Bochum, Germany], P. Vannier [CDS] 19-Mar-2013