Access to Astronomical Catalogues

← Click to display the menu
J/A+A/601/A56      NGC 6802 dwarf cluster members and non-members  (Tang+, 2017)

The Gaia-ESO Survey: the inner disk intermediate-age open cluster NGC 6802. Tang B., Geisler D., Friel E., Villanova S., Smiljanic R., Casey A.R., Randich S., Magrini L., San Roman I., Munoz C., Cohen R.E., Mauro F., Bragaglia A., Donati P., Tautvaisiene G., Drazdauskas A., Zenoviene R., Snaith O., Sousa S., Adibekyan V., Costado M.T., Blanco-Cuaresma S., Jimenez-Esteban F., Carraro G., Zwitter T., Francois P., Jofre P., Sordo R., Gilmore G., Flaccomio E., Koposov S., Korn A.J., Lanzafame A.C., Pancino E., Bayo A., Damiani F., Franciosini E., Hourihane A., Lardo C., Lewis J., Monaco L., Morbidelli L., Prisinzano L., Sacco G., Worley C.C., Zaggia S. <Astron. Astrophys. 601, A56 (2017)> =2017A&A...601A..56T (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Photometry, UBVRI ; Radial velocities Keywords: open clusters and associations: individual: NGC 6802 - open clusters and associations: general - star: abundances Abstract: Milky Way open clusters are very diverse in terms of age, chemical composition, and kinematic properties. Intermediate-age and old open clusters are less common, and it is even harder to find them inside the solar Galactocentric radius, due to the high mortality rate and strong extinction inside this region. NGC 6802 is one of the inner disk open clusters (IOCs) observed by the $Gaia$-ESO survey (GES). This cluster is an important target for calibrating the abundances derived in the survey due to the kinematic and chemical homogeneity of the cluster members in open clusters. Using the measurements from $Gaia$-ESO internal data release 4 (iDR4), we identify 95 dwarf main-sequence stars as cluster members from the GIRAFFE target list, and 8 red giants as cluster members from the UVES target list. The dwarf cluster members have a median radial velocity of 13.6±1.9km/s, while the giant cluster members have a median radial velocity of 12.0±0.9km/s and a median [Fe/H] of 0.10±0.02dex. The color-magnitude diagram of these cluster members suggests an age of $0.9±0.1Gyr, with (m-M)0=11.4 and E(B-V)=0.86. We perform the first chemical abundance analysis of NGC 6802, including 27 element species. To gain a more general picture about IOCs, the measurements of NGC6802 are compared with those of other IOCs previously studied by GES, i.e., NGC 4815, Trumpler 20, NGC 6705, and Berkeley 81. NGC 6802 shows similar C, N, Na, and Al abundances as other IOCs. The abundance versus cluster turn-off mass for these elements in the five GES IOCs cannot firmly exclude any one of the competing nucleosynthetic models, including: standard models; models with rotation induced mixing and/or thermohaline mixing. The five GES IOCs, particularly NGC 6802, seem to have higher s-process element abundances than that of the inner disk field stars. Description: The dwarf stars in NGC 6802 observed by GIRAFFE spectrograph are separated into four tables: 1. cluster members in the lower main sequence; 2. cluster members in the upper main sequence; 3. non-member dwarfs in the lower main sequence; 4. non-member dwarfs in the upper main sequence. The star coordinates, V band magnitude, V-I color, and radial velocity are given. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file lms.dat 48 45 Dwarf cluster members in the lower main sequence ums.dat 48 50 Dwarf cluster members in the upper main sequence lmsno.dat 48 43 Non-member dwarfs in the lower main sequence umsno.dat 48 45 Non-member dwarfs in the upper main sequence
Byte-by-byte Description of file: lms.dat ums.dat lmsno.dat umsno.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Seq Row number 5- 20 A16 --- Name Name (HHMMSSss+DDMMSSs, J2000.0) 22- 27 F6.3 mag Vmag V band magnitude 29- 33 F5.3 mag V-I V-I color index 35- 40 F6.2 km/s RV Radial velocity 42- 46 F5.2 km/s e_RV Error of radial velocity 48 A1 --- sp [Y] Indication of stars belong to the second peak of the radial velocity distribution (for umsno.dat only)
Acknowledgements: Baitian Tang, tangbaitian(at)
(End) Patricia Vannier [CDS] 08-Nov-2016
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

catalogue service

© Université de Strasbourg/CNRS

    • Contact