J/A+A/603/A106 Rotational periods in Cygnus OB2 (Roquette+, 2017)
Near-infrared time-series photometry in the field of Cygnus OB2 association.
I. Rotational scenario for candidate members.
Roquette J., Bouvier J., Alencar S.H.P., Vaz L.P.R., Guarcello M.G.
<Astron. Astrophys. 603, A106 (2017)>
=2017A&A...603A.106R 2017A&A...603A.106R (SIMBAD/NED BibCode)
ADC_Keywords: Associations, stellar ; Stars, pre-main sequence ; YSOs ;
Stars, variable ; Photometry, infrared ; Surveys
Keywords: infrared: stars - stars: variables: T Tauri, Herbig Ae/Be -
stars: formation - stars: low-mass - stars: pre main sequence -
stars: rotation
Abstract:
We present the results of a near-infrared time-series photometry study
in the field of Cygnus OB2 association (RA∼20.55h, DE∼41.2°).
Observations were carried out in the JHK bands at the WFCAM/UKIRT
telescope over 112 observed nights. We investigated the occurrence of
periodicity in the time-series and we found reliable periods for 894
candidate members.
Description:
Our observational dataset was obtained with the 3.8m United Kingdom
Infra-Red Telescope (UKIRT), at Manua Kea, Hawaii, equipped with the
Wide Field Camera (WFCAM); the programs were U/07A/H16 and U/07B/H60.
Our complete dataset is composed of up to 115 nights observed using
the J, H, and K filters (Hewett et al., 2006MNRAS.367..454H 2006MNRAS.367..454H). The
observations were carried during 2007 in two seasons: The first season
comprises 43 observed nights between April 1 and May 21; the second
season comprises 73 observed nights between August 4 and November 3.
The two observational seasons span a total of 217 days. The exposures
were short, 2 seconds in each filter.
Rotational periods for 894 Cygnus OB2 candidate members. For each
star, an internal ID, IDs in Guarcello et al. (2013, Cat.
J/ApJ/773/135) and Guarcello et al. (2015, arXiv:1501.03761),
coordinates, Stetson variability index, period, estimated mass and
reddening, median JHK magnitudes, median JHK photometric errors,
peak-to- peak JHK amplitudes, and Disk class according to Guarcello et
al. (2013, Cat. J/ApJ/773/135) ate presented.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 122 894 Rotational periods for CygOB2 periodic
candidate members
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See also:
J/ApJ/773/135 : Disk-bearing stars in Cygnus OB2 (Guarcello+, 2013)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 I06 --- ID Identification number
8- 11 I4 --- GWD15 ?=- Guarcello et al. (2015, arXiv:1501.03761)
identification number
13- 18 I6 --- GDW13 ?=- Guarcello et al. (2013, Cat. J/ApJ/773/135)
identification number
20- 21 I2 h RAh Right ascension (J2000)
23- 24 I2 min RAm Right ascension (J2000)
26- 27 I2 s RAs Right ascension (J2000)
29 A1 --- DE- Declination sign (J2000)
30- 31 I2 deg DEd Declination (J2000)
33- 34 I2 arcmin DEm Declination (J2000)
36- 37 I2 arcsec DEs Declination (J2000)
39- 42 F4.2 --- Stet Stetson variability index
44- 48 F5.2 d Per Period
50- 53 F4.2 mag AV ?=- Interstellar redenning (1)
55- 58 F4.2 Msun Mass ?=- Mass (2)
60- 64 F5.2 mag Jmag ?=- UKIRT/WFCAM J magnitude
66- 69 F4.2 mag e_Jmag ?=- rms uncertainty on Jmag
71- 74 F4.2 mag ptpJ ?=- Peak to peak amplitude in J band
76- 80 F5.2 mag Hmag ?=- UKIRT/WFCAM H magnitude
82- 85 F4.2 mag e_Hmag ?=- rms uncertainty on Hmag
87- 90 F4.2 mag ptpH ?=- Peak to peak amplitude in H band
92- 96 F5.2 mag Kmag ?=- UKIRT/WFCAM K magnitude
98-101 F4.2 mag e_Kmag ?=- rms uncertainty on Kmag
103-106 F4.2 mag ptpK ?=- Peak to peak amplitude in K band
108-120 A13 --- Class IR classification according to GDW13 (2)
122 A1 --- Disk [0/1] Flag indicating the presence of disk (3)
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Note (1): Estimated using riz data from Guarcello et al. (2012ApJS..202...19G 2012ApJS..202...19G).
Note (2): Disk classification from (Guarcello et al., 2013, Cat. J/ApJ/773/135):
a string describing the classification of the star. If more classifications
are present, they are divided by underscores.
The different codes are:
HE = highly embedded
CL1 = class I YSO
FS = flat-spectrum
CL2 = class II YSO
BWE = blue stars with excesses (candidate stars with disks, but
with optical color bluer than the cluster locus, being more
compatible with the foreground population than with the
association)
TD = transition disk
PTD = pre-transition disk
lowmass = low-mass disk with excesses only in [8.0] and [24]
high-incl = highly inclined disk with excesses only in [8.0] and [24]
Ha = classified as Hα emitter in this paper or by
Vink et al. (2008MNRAS.387..308V 2008MNRAS.387..308V)
Note (3): Flag as follows:
1 = disk-bearing stars in Guarcello et al. (2013, Cat. J/ApJ/773/135)
0 = non disk-bearing stars
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Acknowledgements:
Julia Roquette, juliaroquette(at)gmail.com
(End) Julia Roquette [UFMG, Brazil], Patricia Vannier [CDS] 10-May-2017