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 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:
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FileName Lrecl Records Explanations
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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
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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
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Bytes Format Units Label Explanations
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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
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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 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.
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Acknowledgements:
Laura Venuti, lvenuti(at)astropa.unipa.it
(End) Laura Venuti [INAF-OAPa, Italy], Patricia Vannier [CDS] 15-Sep-2017