J/A+A/626/A90 Pismis 18 photometry and radial velocities (Hatzidimitriou+, 2019)
The Gaia-ESO Survey: The inner disk, intermediate-age open cluster Pismis 18.
Hatzidimitriou D., Held E.V., Tognelli E., Bragaglia A., Magrini L.,
Bravi L., Gazeas K., Dapergolas A., Drazdauskas A., Delgado-Mena E.,
Friel E.D., Minkevi?ci-ut?e R., Sordo R., Tautvaisien?e G., Gilmore G.,
Randich S., Feltzing S., Vallenari A., Alfaro E.J., Flaccomio E.,
Lanzafame A.C., Pancino E., Smiljanic R., Bayo A., Bergemann M., Carraro G.,
Casey A.R., Costado M.T., Damiani F., Franciosini E., Gonneau A., Jofre P.,
Lewis J., Monaco L., Morbidelli L., Worley C.C., Zaggia S.
<Astron. Astrophys. 626, A90 (2019)>
=2019A&A...626A..90H 2019A&A...626A..90H (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Radial velocities ; Photometry
Keywords: stars: abundances -
open clusters and associations: individual: Pismis 18 -
Galaxy : abundances - Galaxy: formation - Galaxy: disc
Abstract:
Pismis 18 is a moderately populated, intermediate-age open cluster
located within the solar circle at a Galactocentric distance of about
seven kpc. Few open clusters have been studied in detail in the inner
disc region before the Gaia-ESO Survey.
New data from the Gaia-ESO Survey allowed us to conduct an extended
radial velocity membership study as well as spectroscopic metallicity
and detailed chemical abundance measurements for this cluster.
Gaia-ESO Survey data for 142 potential members, lying on the upper
main sequence and on the red clump, yielded radial velocity
measurements, which, together with proper motion measurements from the
Gaia Second Data Release (Gaia DR2), were used to determine the
systemic velocity of the cluster and membership of individual stars.
Photometry from Gaia DR2 was used to re-determine cluster parameters
based on high confidence member stars only. Cluster abundance
measurements of six radial-velocity member stars with UVES
high-resolution spectroscopy are presented for 23 elements.
The average radial velocity of 26 high confidence members is
-27.5±2.5(std)km/s with an average proper motion of
pmra=-5.65±0.08(std)mas/yr and pmdec=-2.29±0.11(std)mas/yr.
According to the new estimates, based on high confidence members,
Pismis 18 has an age of τ=700+40-50Myr, interstellar reddening
of E(B-V)=0.562+0.012-0.026mag and a de-reddened distance modulus
of DM0=11.96+0.10-0.24mag. The median metallicity of the cluster
(using the six UVES stars) is [Fe/H]=+0.23±0.05dex, with
[α/Fe]=0.07±0.13 and a slight enhancement of s- and r-
neutron-capture elements.
With the present work, we fully characterized the open cluster Pismis
18.We confirmed its present location in the inner disc. We estimated a
younger age than the previous literature values and we gave, for the
first time, its metallicity and its detailed abundances. Its
[α/Fe] and [s-process/Fe], both slightly super-solar, are in
agreement with other inner-disc open clusters observed by the Gaia-ESO
survey.
Description:
The data for Pismis 18 were obtained in May and June 2014 with FLAMES
on the VLT-UT2 telescope at the European Southern Observatory.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 300 142 Photometry and radial velocities for all
observed target
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See also:
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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3- 18 A16 --- CName Target Name in the Gaia-ESO archive,
HHMMSSss+DDMMSSs
20- 38 I19 --- GaiaDR2 ?=- GAIA DR2 ID (source_id)
42 A1 --- Memb [m] m denotes high confidence membership
44- 54 F11.7 deg RAdeg Right Ascension (J2000)
57- 67 F11.7 deg DEdeg Declination (J2000)
71- 85 A15 --- Inst Instrumental setup
88- 94 F7.2 km/s RV Radial Velocity (km/sec)
96-101 F6.2 km/s e_RV Error in Radial Velocity (km/sec)
104-109 F6.3 mag Bpmag ?=- Gaia_DR2 Bp magnitude
112-117 F6.3 mag Gmag ?=- Gaia_DR2 G magnitude
120-125 F6.3 mag Rpmag ?=- Gaia_DR2 Rp magnitude
128-133 F6.3 mag gmag ?=- g-magnitude VPHAS_DR1
135-139 F5.3 mag e_gmag ?=- Error in g-magnitude VPHAS_DR1
141-146 F6.3 mag rmag ?=- r-magnitude VPHAS_DR1
148-152 F5.3 mag e_rmag ?=- Error in r-magnitude VPHAS_DR1
154-159 F6.3 mag imag ?=- i-magnitude VPHAS_DR1
161-165 F5.3 mag e_imag ?=- Error in i-magnitude VPHAS_DR1
168-173 F6.3 mag Jmag ?=- 2MASS J magnitude
175-179 F5.3 mag e_Jmag ?=- Error in 2MASS J magnitude
181-186 F6.3 mag Hmag 2MASS H magnitude
188-192 F5.3 mag e_Hmag ?=- Error in 2MASS H magnitude
194-199 F6.3 mag Kmag ?=- 2MASS K magnitude
201-205 F5.3 mag e_Kmag ?=- Error in 2MASS K magnitude
209-211 I3 --- Webda ?=- Webda ID
216-221 F6.3 mag Vmag ?=- Column 25 V magnitude from Piatti et al.
(1998AJ....116..801P 1998AJ....116..801P)
224-228 F5.3 mag B-V ?=- B-V colour from Piatti et al.
(1998AJ....116..801P 1998AJ....116..801P)
231-235 F5.3 mag V-I ?=- V-I colour from Piatti et al.
(1998AJ....116..801P 1998AJ....116..801P)
239-243 F5.2 arcmin Dist Projected Radial distance from cluster center
247-251 F5.1 km/s RVC ?=- Radial Velocity from Carlberg
(2014AJ....147..138C 2014AJ....147..138C, Cat. J/AJ/147/138)
255-260 F6.3 mas Plx ?=- Parallax from Gaia_DR2
263-267 F5.3 mas e_Plx ?=- Error in Parallax from Gaia_DR2
270-276 F7.3 mas/yr pmRA ?=- Proper Motion in RA, pmRA*DE
280-284 F5.3 mas/yr e_pmRA ?=- Error in Proper Motion in RA
288-294 F7.3 mas/yr pmDE ?=- Proper Motion in Dec
296-300 F5.3 mas/yr e_pmDE ?=- Error in Proper Motion in DE
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Acknowledgements:
Despina Hatzidimitriou, deshatzi(at)phys.uoa.gr
(End) Patricia Vannier [CDS] 10-Jun-2019