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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 (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). 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:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 122 894 Rotational periods for CygOB2 periodic candidate members
See also: J/ApJ/773/135 : Disk-bearing stars in Cygnus OB2 (Guarcello+, 2013) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
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)
Note (1): Estimated using riz data from Guarcello et al. (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) Note (3): Flag as follows: 1 = disk-bearing stars in Guarcello et al. (2013, Cat. J/ApJ/773/135) 0 = non disk-bearing stars
Acknowledgements: Julia Roquette, juliaroquette(at)
(End) Julia Roquette [UFMG, Brazil], Patricia Vannier [CDS] 10-May-2017
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