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J/A+A/609/A10       NGC2264 structure and star formation history (Venuti+, 2018)

The Gaia-ESO Survey and CSI 2264: Substructures, disks, and sequential star formation in the young open cluster NGC 2264. Venuti L., Prisinzano L., Sacco G.G., Flaccomio E., Bonito R., Damiani F., Micela G., Guarcello M.G., Randich S., Stauffer J.R., Cody A.M., Jeffries R.D., Alencar S.H.P., Alfaro E.J., Lanzafame A.C., Pancino E., Bayo A., Carraro G., Costado M.T., Frasca A., Jofre P., Morbidelli L., Sousa S.G., Zaggia S. <Astron. Astrophys. 609, A10 (2018)> =2018A&A...609A..10V (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Stars, pre-main sequence ; YSOs ; Photometry, SDSS ; Spectroscopy Keywords: accretion, accretion disks - stars: formation - Hertzsprung-Russell and C-M diagrams - stars: pre-main sequence - open clusters and associations: individual: NGC 2264 Abstract: Reconstructing the structure and history of young clusters is pivotal to understanding the mechanisms and timescales of early stellar evolution and planet formation. Recent studies suggest that star clusters often exhibit a hierarchical structure, possibly resulting from several star formation episodes occurring sequentially rather than a monolithic cloud collapse. We aim to explore the structure of the open cluster and star-forming region NGC 2264 (∼3Myr), which is one of the youngest, richest and most accessible star clusters in the local spiral arm of our Galaxy; we link the spatial distribution of cluster members to other stellar properties such as age and evolutionary stage to probe the star formation history within the region. We combined spectroscopic data obtained as part of the Gaia-ESO Survey (GES) with multi-wavelength photometric data from the Coordinated Synoptic Investigation of NGC 2264 (CSI 2264) campaign. We examined a sample of 655 cluster members, with masses between 0.2 and 1.8M and including both disk-bearing and disk-free young stars. We used Teff estimates from GES and g,r,i photometry from CSI 2264 to derive individual extinction and stellar parameters. Description: We aim to explore the structure of the open cluster and star-forming region NGC 2264 (3 Myr), and to reconstruct its star formation history. Our study focuses on a sample of 655 young stars in the region. We employed spectroscopic data from the Gaia-ESO Survey and multi-wavelength photometry from the CSI 2264 campaign to: i) derive individual extinction and stellar parameters (mass, age) for cluster members; ii) classify the evolutionary status of the objects (disk-bearing/disk-free, accreting/non-accreting); iii) explore the nature of young stars at different locations within the cluster as a function of age. In tableb1, we provide the following information: object identifiers in the Gaia-ESO Survey and CSI 2264 catalogs; spatial coordinates; membership flag; g,r,i photometry; disk classification; accreting status; gamma-index; effective temperature; Lithium equivalent width (EW); Halpha EW and width at 10% intensity; photometric Halpha emission; UV excess; Av; bolometric luminosity; mass and age estimates. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tableb1.dat 140 1892 List of the Gaia-ESO Survey targets in the NGC2264 field and of their CSI 2264 counterpart
See also: J/AJ/114/2644 : UBVRIHa photometry of NGC2264 (Sung+, 1997) J/A+A/345/521 : BVRI photometry of NGC 2264 (Flaccomio+, 1999) J/AJ/127/1117 : Halpha emission-line stars in NGC2264 (Reipurth+, 2004) J/AJ/138/1116 : A Spitzer view of NGC 2264 (Sung+, 2009) J/A+A/455/903 : ACIS-I observations of NGC 2264 (Flaccomio+, 2006) J/ApJ/741/35 : NIR photometry and polarization in NGC 2264 (Kwon+, 2011) J/A+A/570/A82 : Mapping accretion variability in NGC 2264 (Venuti+, 2014) J/A+A/581/A66 : UV variability and accretion in NGC 2264 (Venuti+, 2015) J/MNRAS/453/2006 : NGC 2264 SCUBA-2 observations (Buckle+, 2015) J/A+A/590/A78 : NGC2264 weak-line T Tauri lithium abundances (Bouvier+ 2016) J/A+A/586/A47 : Accretion process in NGC 2264 (Sousa+, 2016) J/A+A/599/A23 : Accretion-rotation connection in NGC 2264 (Venuti+, 2017) Byte-by-byte Description of file: tableb1.dat
Bytes Format Units Label Explanations
1- 16 A16 --- CNAME Gaia-ESO Survey target identifier 18- 30 A13 --- CSIMon ? CSI 2264 object identifier 32- 40 F9.5 deg RAdeg Right ascension (J2000) 42- 49 F8.5 deg DEdeg Declination (J2000) 51 A1 --- Memb [*] Membership flag (1) 53- 58 F6.3 mag gmag ? SDSS g-band photometry 60- 65 F6.3 mag rmag ? SDSS r-band photometry 67- 72 F6.3 mag imag ? SDSS i-band photometry 74- 76 A3 --- Class [II III] Disk classification (2) 78 A1 --- Acc [Y/N] Accreting status (3) 80- 84 F5.3 --- gamma ? gamma-index (4) 86- 89 I4 K Teff ? Stellar effective temperature 91- 93 I3 0.1pm EW(Li) ? Lithium equivalent width, in milliAngstrom 95- 99 F5.1 0.1nm EW(Ha) ? Halpha equivalent width, in Angstrom 101-103 I3 km/s W10(Ha) ? Halpha width at 10% intensity 105-109 F5.2 mag D(r-Ha) ? Photometric (r-Halpha) excess (5) 111-115 F5.2 mag E(u-r) ? Photometric UV excess (6) 117-121 F5.2 mag AV ? Individual visual extinction estimate 123-128 F6.3 Lsun Lbol ? Bolometric luminosity 130-133 F4.2 Msun Mstar ? Stellar mass 135-140 F6.2 Myr Age ? Individual age estimate
Note (1): "*" = member. Note (2): Disk classification as follows: II = disk-bearing III = disk-free Note (3): Accreting status as follows: Y = accreting N = non-accreting Note (4): gravity indicator defined in Damiani et al. (2014A&A...566A..50D) Note (5): measured D(r-Ha) larger than the threshold indicates Halpha emitter (potential accreting object). Note (6): strong (more negative) E(u-r) is indicative of ongoing accretion.
Acknowledgements: Laura Venuti, lvenuti(at)astropa.unipa.it
(End) Laura Venuti [INAF-OAPa, Italy], Patricia Vannier [CDS] 15-Sep-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

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