J/MNRAS/486/2477 Catalogue of members of NGC 6530 (Wright+, 2019)
The Gaia-ESO Survey: asymmetric expansion of the Lagoon Nebula cluster NGC 6530
from GES and Gaia DR2.
Wright N.J., Jeffries R.D., Jackson R.J., Bayo A., Bonito R., Damiani F.,
Kalari V., Lanzafame A.C., Pancino E., Parker R.J., Prisinzano L.,
Randich S., Vink J.S., Alfaro E.J., Bergemann M., Franciosini E.,
Gilmore G., Gonneau A., Hourihane A., Jofre P., Koposov S.E., Lewis J.,
Magrini L., Micela G., Morbidelli L., Sacco G.G., Worley C.C., Zaggia S.
<Mon. Not. R. Astron. Soc., 486, 2477-2493 (2019)>
=2019MNRAS.486.2477W 2019MNRAS.486.2477W (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Populations, stellar ; Photometry ;
Effective temperatures ; Radial velocities ; Stars, masses
Keywords: stars: formation - stars: kinematics and dynamics -
open clusters and associations: individual: Lagoon Nebula, NGC 6530, M8
Abstract:
The combination of precise radial velocities from multi-object
spectroscopy and highly accurate proper motions from Gaia DR2 opens up
the possibility for detailed 3D kinematic studies of young
star-forming regions and clusters. Here, we perform such an analysis
by combining Gaia-ESO Survey spectroscopy with Gaia astrometry for
∼900 members of the Lagoon Nebula cluster, NGC 6530. We measure the 3D
velocity dispersion of the region to be 5.35+0.39-0.34km/s, which
is large enough to suggest the region is gravitationally unbound. The
velocity ellipsoid is anisotropic, implying that the region is not
sufficiently dynamically evolved to achieve isotropy, though the
central part of NGC 6530 does exhibit velocity isotropy that suggests
sufficient mixing has occurred in this denser part. We find strong
evidence that the stellar population is expanding, though this is
preferentially occurring in the declination direction and there is
very little evidence for expansion in the right ascension direction.
This argues against a simple radial expansion pattern, as predicted by
models of residual gas expulsion. We discuss these findings in the
context of cluster formation, evolution, and disruption theories.
Description:
We present photometry and spectroscopic properties of young stars in
NGC 6530. Additional stellar parameters are derived from fitting
evolutionary models to the observed photometric spectral energy
distributions. Uncertainties are presented for all quantities.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table.dat 281 819 Photometric and spectroscopic measurements
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
J/A+AS/123/63 : NGC 6530 multiwavelength photometry (van den Ancker+ 1997)
J/AJ/120/333 : UBVRI and Hα in NGC 6530 (Sung+, 2000)
J/A+A/395/499 : XMM observations in M8 and NGC6530 (Rauw+, 2002)
J/ApJ/608/781 : NGC 6530 Chandra X-ray catalog (Damiani+, 2004)
J/A+A/430/941 : Star formation region NGC 6530 (Prisinzano+, 2005)
J/AJ/134/1368 : Proper motions in NGC 2244 and NGC 6530 (Chen+, 2007)
J/A+A/462/123 : VLT/Flames spectroscopic data of NGC 6530 (Prisinzano+, 2007)
J/A+A/546/A9 : Spectral classification of NGC 6530 stars (Prisinzano+, 2012)
J/ApJ/747/51 : Lagoon Nebula stars. I. Rotation periods (Henderson+, 2012)
J/A+A/566/A50 : Classification of stellar spectra 644-681nm (Damiani+, 2014)
J/A+A/580/A75 : Velocity precision in the Gaia-ESO Survey (Jackson+, 2015)
J/A+A/623/A25 : Photometric and astrometric study of NGC 6530 (Damiani+, 2019)
Byte-by-byte Description of file: table.dat
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Bytes Format Units Label Explanations
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1- 10 F10.6 deg RAdeg Right ascension (J2000.0)
12- 21 F10.6 deg DEdeg Declination (J2000.0)
23- 38 A16 --- GES Gaia-ESO Survey source name
40- 58 I19 --- Gaia ? Gaia DR2 source name (Cat. I/345)
60- 65 F6.3 mag Bmag ? B band magnitude (1)
67- 71 F5.3 mag e_Bmag ? B band error (1)
73- 78 F6.3 mag Vmag ? V band magnitude (1)
80- 84 F5.3 mag e_Vmag ? V band error (1)
86- 91 F6.3 mag Imag ? I band magnitude (1)
93- 97 F5.3 mag e_Imag ? I band error (1)
99-105 F7.4 mag Gmag ? G band magnitude from Gaia DR2
107-112 F6.4 mag e_Gmag ? G band error from Gaia DR2
114-119 F6.3 mag Jmag ? J band magnitude from 2MASS
121-125 F5.3 mag e_Jmag ? J band error from 2MASS
127-132 F6.3 mag Hmag ? H band magnitude from 2MASS
134-138 F5.3 mag e_Hmag ? H band error from 2MASS
140-145 F6.3 mag Kmag ? K band magnitude from 2MASS
147-151 F5.3 mag e_Kmag ? K band error from 2MASS
153-155 A3 --- 2Mflg 2MASS quality flag for J/H/K magnitudes
157-161 I5 K Teff ? Spectroscopic Teff from GES
163-169 F7.3 km/s RV ? Spectroscopic radial velocity from GES
171-176 F6.3 km/s e_RV ? Error on RV (2)
178-182 F5.3 --- Gamma ? GES gamma index (3)
184-188 F5.3 --- e_Gamma ? Error on Gamma (3)
190-195 F6.1 mA EWLi ? GES Lithium 6708A equivalent width
197-202 F6.1 mA e_EWLi ? Error on EWLi
204-208 F5.2 A FWZIHa ? GES full width at zero intensity for H-alpha
210-214 F5.2 A e_FWZIHa ? Error on FWZIHa
216-221 F6.4 mas Plx ? Gaia DR2 parallax
223-228 F6.4 mas e_Plx ? Error on Plx
230-237 F8.4 mas pmRA* ? Gaia DR2 proper motion in Right Ascension,
pmRA*cosDE
239-245 F7.4 mas e_pmRA* ? Error on pmrA
247-254 F8.4 mas pmDE ? Gaia DR2 proper motion in Declination
256-262 F7.4 mas e_pmDE ? Error on pmDE
264-269 F6.2 Msun Mass Stellar mass (4)
271-275 F5.2 Msun E_Mass Upper 1 sigma uncertainty on Mass (4)
277-281 F5.2 Msun e_Mass Lower 1 sigma uncertainty on Mass (4)
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Note (1): Photometry from Prisinzano et al. (2005A&A...430..941P 2005A&A...430..941P,
Cat. J/A+A/430/941).
Note (2): Calculated from Jackson et al. (2015A&A...580A..75J 2015A&A...580A..75J,
Cat. J/A+A/580/A75).
Note (3): Derived according to Damiani et al. (2014A&A...566A..50D 2014A&A...566A..50D,
Cat. J/A+A/566/A50).
Note (4): calculated using Marigo et al. isochrones (2017ApJ...835...77M 2017ApJ...835...77M).
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Acknowledgements:
Nicholas J. Wright, n.j.wright(at)keele.ac.uk
(End) Nicholas Wright [Keele, UK], Patricia Vannier [CDS] 16-Aug-2019