J/A+A/631/A57 IC 4665 DANCe (Miret-Roig+, 2019)
IC 4665 DANCe.
I. Members, empirical isochrones, magnitude distributions, present-day
system mass function, and spatial distribution.
Miret-Roig N., Bouy H., Olivares J., Sarro L.-M., Tamura M., Allen L.,
Bertin E., Serre S., Berihuete A., Beletsky Y., Barrado D., Huelamo N.,
Cuillandre J.-C., Moraux E., Bouvier J.
<Astron. Astrophys. 631, A57 (2019)>
=2019A&A...631A..57M 2019A&A...631A..57M (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Clusters, open ; Proper motions ;
Parallaxes, trigonometric ; Photometry
Keywords: proper motions - stars: luminosity function, mass function -
open clusters and associations: individual: IC 4665
stars: low-mass - (stars:) brown dwarfs
Abstract:
The study of star formation is extremely challenging due to the lack
of complete and clean samples of young, nearby clusters, and star
forming regions. The recent Gaia DR2 catalogue complemented with the
deep, ground based COSMIC DANCe catalogue offers a new database of
unprecedented accuracy to revisit the membership of clusters and star
forming regions. The 30 Myr open cluster IC 4665 is one of the few
well-known clusters of this age and it is an excellent target where to
test evolutionary models and study planetary formation.
We aim to provide a comprehensive membership analysis of IC 4665 and
to study the following properties: empirical isochrones, distance,
magnitude distribution, present-day system mass function, and spatial
distribution.
We use the Gaia DR2 catalogue together with the DANCe catalogue to
look for members using a probabilistic model of the distribution of
the observable quantities in both the cluster and background
populations.
We obtain a final list of 819 candidate members which cover a 12.4
magnitude range (7<J<19.4). We find that 50% are new candidates,
and we estimate a conservative contamination rate of 20%. This unique
sample of members allows us to obtain a present-day system mass
function in the range of 0.02-6M☉, which reveals a number of
details not seen in previous studies. In addition, they favour a
spherically symmetric spatial distribution for this young open
cluster.
Our membership analysis represents a significant increase in the
quantity and quality (low-contamination) with respect to previous
studies. As such, it offers an excellent opportunity to revisit other
fundamental parameters such as the age.
Description:
Table 4. GDR2 catalogue of IC4665 in a region of 3° around the
cluster center. This table includes data from the Gaia DR2 and the
membsership probabilities.
Table 5. DANCe catalogue of IC4665 in a region of 3° around the
cluster center. This table includes positions, proper motion,
multi-wavelength GBPRPgrizYJHK photometry and membsership
probabilities.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 179 1217725 Gaia DR2 catalogue of IC4665
table5.dat 685 2358937 DANCe catalogue of IC4665
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See also:
J/A+A/448/189 : IzJHK photometry of IC4665 (de Wit+, 2006)
J/A+A/479/141 : Iz photometry, RV and EW(Li) in IC 4665 (Manzi+, 2008)
J/MNRAS/400/317 : IC 4665 low-mass members (Jeffries+, 2009)
J/AJ/140/677 : BVIc photometry of IC 4665 (Cargile+, 2010)
J/A+A/532/A103 : Photometry and proper motions in IC4665 (Lodieu+, 2011)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 I19 --- GaiaDR2 Gaia DR2 source id (source_id)
21- 35 F15.11 deg RAdeg Barycentric right ascension (ICRS)
at Ep=2015.5 (ra)
37- 49 F13.11 deg DEdeg Barycentric declination (ICRS)
at Ep=2015.5 (dec)
51- 59 F9.6 mag Gmag G-band mean magnitude (Vega)
(photgmean_mag)
61- 83 E23.17 --- Ppin0.5 Cluster membership probability at
pin 0.5 (probability_pin = 0.5)
85-107 E23.17 --- Ppin0.6 Cluster membership probability at
pin 0.6 (probability_pin = 0.6)
109-131 E23.17 --- Ppin0.7 Cluster membership probability at
pin 0.7 (probability_pin = 0.7)
133-155 E23.17 --- Ppin0.8 Cluster membership probability at
pin 0.8 (probability_pin = 0.8)
157-179 E23.17 --- Ppin0.9 Cluster membership probability at
pin 0.9 (probability_pin = 0.9)
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 7 I7 --- DANCe Internal id (ID)
9- 26 F18.14 deg RAdeg Right ascension (J2000) (RAJ2000)
28- 47 E20.15 mas e_RAdeg Standard error of right ascension (e_RAJ2000)
49- 66 F18.16 deg DEdeg Declination (J2000) (DEJ2000)
68- 87 E20.15 mas e_DEdeg Standard error of declination (e_DEJ2000)
89- 96 E8.4 mas Plx ? Gaia DR2 parallax (parallax)
98-103 F6.4 mas e_Plx ? Gaia DR2 standard error of parallax
(parallax_error)
105-117 E13.7 mas/yr pmRA Proper motion in right ascension direction
(pmRA*cosDE) (pmRA)
119-130 F12.9 mas/yr e_pmRA Standard error of pmRA (e_pmRA)
132-153 E22.17 mas/yr pmDE Proper motion in declination direction
(pmDec)
155-167 F13.10 mas/yr e_pmDE Standard error of pmDec (e_pmDec)
169-175 A7 --- r_pm Source of proper motion (1)
177-183 F7.4 mag Gmag ? Gaia DR2 G magnitude
185-195 F11.9 mag e_Gmag ? Standard error of G magnitude
197-203 F7.4 mag BPmag ? Gaia DR2 BP magnitude
205-216 F12.9 mag e_BPmag ? Standard error of BP magnitude
218-224 F7.4 mag RPmag ? Gaia DR2 RP magnitude
226-237 F12.9 mag e_RPmag ? Standard error of RP magnitude
239-256 F18.15 mag gmag ? Pan-STARRS PS1 g magnitude
258-277 F20.18 mag e_gmag ? Standard error of Pan-STARRS PS1 g magnitude
279-296 F18.15 mag rmag ? Pan-STARRS PS1 r magnitude
298-317 F20.18 mag e_rmag ? Standard error of Pan-STARRS PS1 r magnitude
319-337 F19.16 mag imag ? Pan-STARRS PS1 i magnitude
339-358 F20.18 mag e_imag ? Standard error of Pan-STARRS PS1 i magnitude
360-378 F19.16 mag zmag ? Pan-STARRS PS1 z magnitude
380-399 F20.18 mag e_zmag ? Standard error of Pan-STARRS PS1 z magnitude
401-419 F19.16 mag ymag ? Pan-STARRS PS1 y magnitude
421-440 F20.18 mag e_ymag ? Standard error of Pan-STARRS PS1 y magnitude
442-460 F19.16 mag Jmag ? 2MASS J magnitude
462-481 F20.18 mag e_Jmag ? Standard error of J magnitude
483-502 F20.17 mag Hmag ? 2MASS H magnitude
504-523 F20.18 mag e_Hmag ? Standard error of H magnitude
525-544 F20.17 mag Ksmag ? 2MASS Ks magnitude
546-565 F20.18 mag e_Ksmag ? Standard error of Ks magnitude
567-589 E23.17 --- Ppin0.5 Cluster membership probability at pin 0.5
(probability_pin = 0.5)
591-613 E23.17 --- Ppin0.6 Cluster membership probability at pin 0.6
(probability_pin = 0.6)
615-637 E23.17 --- Ppin0.7 Cluster membership probability at pin 0.7
(probability_pin = 0.7)
639-661 E23.17 --- Ppin0.8 Cluster membership probability at pin 0.8
(probability_pin = 0.8)
663-685 E23.17 --- Ppin0.9 Cluster membership probability at pin 0.9
(probability_pin = 0.9)
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Note (1): Source of proper motion as follows:
gaiadr2 = Gaia DR2 proper motions
DANCe = COSMIC-DANCe proper motions
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Acknowledgements:
Nuria Miret-Roig, nuria.miret-roig(at)u-bordeaux.fr
(End) Nuria Miret-Roig [Univ. Bordeaux], Patricia Vannier [CDS] 31-Jul-2019