J/A+A/586/A52 NGC 2264, NGC 2547 and NGC 2516 stellar radii (Jackson+, 2016) ================================================================================ The Gaia-ESO Survey: Stellar radii in the young open clusters NGC 2264, NGC 2547 and NGC 2516. Jackson R.J., Jeffries R.D., Randich S., Bragaglia A., Carraro G., Costado M.T., Flaccomio E., Lanzafame , Lardo C., Monaco L., Morbidelli L., Smiljanic R., Zaggia S. =2016A&A...586A..52J (SIMBAD/NED BibCode) ================================================================================ ADC_Keywords: Clusters, open ; Stars, diameters Keywords: stars: rotation - stars: low-mass - stars: activity - open clusters and associations: NGC 2264 - open clusters and associations: NGC 2547 - open clusters and associations: NGC 2516 Abstract: Rapidly rotating, low-mass members of eclipsing binary systems have measured radii that are significantly larger than predicted by standard evolutionary models. It has been proposed that magnetic activity is responsible for this radius inflation. By estimating the radii of low-mass stars in three young clusters (NGC 2264, NGC 2547, NGC 2516, with ages of ~5, ~35 and ~140Myr respectively), we aim to establish whether similar radius inflation is seen in single, magnetically active stars. We use radial velocities from the Gaia-ESO Survey (GES) and published photometry to establish cluster membership and then combine GES measurements of projected equatorial velocities with published rotation periods to estimate the average radii for groups of fast-rotating cluster members as a function of their luminosity and age. The average radii are compared with the predictions of both standard evolutionary models and variants that include magnetic inhibition of convection and starspots. Description: File Table1.dat contains Photometric and spectroscopic data of GES Survey targets in clusters in NGC 2547, NGC 2516, NGC 22264 downloaded from the Edinburugh GES archive (http://ges/roe.ac.uk/) . Photometric data comprised the (Cousins) I magnitude and 2MASS J, H and K magnitudes. Spectroscopic data comprises the signal to noise ratio, S/N of the target spectrum, the radial velocity, RV (in km/s), the projected equatorial velocity, vsini (in km/s), the number of separate observations co-added to produce the target spectrum and the log of effective temperature (logTeff) of the template spectrum fitted to measure RV and vsini. The absolute precision in RV, pRV (in km/s) and relative precision vsini (pvsini) were estimated, as a function of the logTeff, vsini and S/N, using the prescription described in Jackson et al. (2015A&A...580A..75J, Cat. J/A+A/580/A75). File Table3.dat contains measured and calculated properties of cluster targets with resolved vsini and a reported rotation period. The cluster name, right ascension, RA (deg) and declination, Dec (deg) are given for targets with measured periods given in the literature. Dynamic properties comprise: the radial velocity, RV (in km/s), the absolute precision in RV, pRV (km/s), the projected equatorial velocity, vsini (in km/s), the relative precision in vsini (pvsini) and the rotational period (in days). Also shown are values of absolute K magnitude, MK log of luminosity, log L (in solar units) and probability of cluster membership estimated using cluster data given in the text. Period shows reported values of cluster taken from the literature Estimated values of the projected radius, Rsini (in Rsolar) and uncertainty in projected radius, e_Rsini (in Rsolar) are given for targets where vsini>5km/s and pvsini>0.2. The final column shows a flag which is set to 1 for targets in cluster NGC 2264 where a (H-K) versus (J-H) colour-colour plot indicates possible infra-red excess. Period shows reported values of cluster taken from the literature File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 92 2755 Photometric and spectroscopic data of GES Survey targets in clusters in NGC 2547, NGC 2516, NGC 22264 downloaded from the Edinburugh GES archive table3.dat 85 387 Measured and calculated properties of cluster targets with resolved vsini and a reported rotation period -------------------------------------------------------------------------------- Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 7 A7 --- Cluster Name of cluster 9- 24 A16 --- Object Name of target (HHMMSSss+DDMMSSs, J2000) 26- 30 F5.2 mag Icmag ?=- Relative I magnitude (Cousins) 32- 36 F5.2 mag Jmag Relative Jmag from 2MASS 38- 42 F5.2 mag Hmag Relative Hmag from 2MASS 44- 48 F5.2 mag Kmag Relative Kmag from 2MASS 50- 55 F6.2 --- S/N Signal to noise ratio 57- 63 F7.2 km/s RV Radial velocity 65- 70 F6.2 km/s vsini Projected equatorial velocity 72- 76 F5.3 [K] logTeff Log of effective temperature 78- 79 I2 --- Nsp Number of spectra co-added 81- 86 F6.2 km/s pRV ? Precision in RV 88- 92 F5.2 --- pvsini ? Relative precision in vsini -------------------------------------------------------------------------------- Byte-by-byte Description of file: table3.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 7 A7 --- Cluster Name of cluster 9- 16 F8.4 deg RAdeg Right ascension (J2000) 18- 25 F8.4 deg DEdeg Declination (J2000) 27- 32 F6.2 km/s RV Radial velocity 34- 37 F4.2 km/s pRV Absolute precision in RV 39- 44 F6.2 km/s vsini Projected equatorial velocity 46- 50 F5.2 --- pvsini Relative precision in vsini 52- 55 F4.2 mag KMAG Absolute K magnitude 57- 61 F5.2 [Lsun] logL log of luminosity 63- 66 F4.2 --- Member Estimated probability of membership 68- 72 F5.2 d Period Rotational period 74- 78 F5.2 Rsun Rsini ?=- Esimated value of projected stellar radius 80- 83 F4.2 Rsun e_Rsini ?=- Estimate uncertainty in Rsini 85 I1 --- Flag [1]? Flag of targets with possible infra-red excess (1) -------------------------------------------------------------------------------- Note (1): 1 = (H-K) versus (J-H) colour-colour plot indicates possible infra-red excess -------------------------------------------------------------------------------- Acknowledgements: Richard Jackson, r.j.jackson(at)keele.ac.uk ================================================================================ (End) Richard Jackson [Keele University], Patricia Vannier [CDS] 20-Nov-2015