Access to Astronomical Catalogues

← Click to display the menu
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)gmail.com
(End) Julia Roquette [UFMG, Brazil], Patricia Vannier [CDS] 10-May-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service

© UDS/CNRS

Contact