J/AJ/138/159 NGC 6819 stellar radial-velocity and photometry (Hole+, 2009)
WIYN open cluster study.
XXIV. Stellar radial-velocity measurements in NGC 6819.
Hole K.T., Geller A.M., Mathieu R.D., Platais I., Meibom S., Latham D.W.
<Astron. J., 138, 159-168 (2009)>
=2009AJ....138..159H 2009AJ....138..159H
ADC_Keywords: Clusters, open ; Radial velocities ; Photometry, CCD ;
Photometry, UBVRI ; Photometry, infrared
Keywords: open clusters and associations: individual (NGC 6819) -
techniques: radial velocities
Abstract:
We present the current results from our ongoing radial-velocity (RV)
survey of the intermediate-age (2.4Gyr) open cluster NGC 6819. Using
both newly observed and other available photometry and astrometry, we
define a primary target sample of 1454 stars that includes
main-sequence, subgiant, giant, and blue straggler stars, spanning a
magnitude range of 11≤V≤16.5 and an approximate mass range of
1.1-1.6M☉. Our sample covers a 23 arcminute (13pc) square field
of view centered on the cluster. We have measured 6571 radial
velocities for an unbiased sample of 1207 stars in the direction of
the open cluster NGC 6819, with a single-measurement precision of
0.4km/s for most narrow-lined stars. We use our RV data to calculate
membership probabilities for stars with ≥3 measurements, providing
the first comprehensive membership study of the cluster core that
includes stars from the giant branch through the upper main sequence.
We identify 480 cluster members. Additionally, we identify
velocity-variable systems, all of which are likely hard binaries that
dynamically power the cluster.
Description:
There are four sources of CCD BV photometry available to us for the
cluster: RV98, Kalirai et al. (2001AJ....122..266K 2001AJ....122..266K, hereafter K01),
and two unpublished sets taken by members of the WOCS (WIYN Open
Cluster Study) collaboration.
The two sets of WOCS photometry were obtained at what was the KPNO and
is now the WIYN7 0.9m telescope. In 1998 March, C. Dolan & R. Mathieu
took BV CCD images to begin this RV project, hereafter called Phot98.
These observations used the Tektronics CCD (T2KA) at f/7.5.
The WOCS UBVRI study (hereafter Phot03) is based on images obtained
with the SITe S2KB CCD camera (pixel size 0.60"), yielding an FOV
of 20'.
In total, we have observed 90 pointings on NGC 6819 over 35 separate
observing runs on the WIYN 3.5m.
The CfA RV measurements were obtained with two nearly identical
instruments on the Multiple Mirror Telescope and the 1.5m
Tillinghast Reflector at the Whipple Observatory atop Mt. Hopkins,
Arizona.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 108 1305 The NGC 6819 WOCS photometry database
table2.dat 102 1207 The NGC 6819 WOCS radial-velocity database
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See also:
J/MNRAS/358/795 : Variable stars in NGC 6819 field (Street+, 2005)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I06 --- WOCS [1001/115030] WIYN Open Cluster Study
identification (G1)
9- 14 F6.3 mag Vmag ? Phot98 project V band magnitude
16- 21 F6.3 mag B-V ? Phot98 project (B-V) color index
23- 28 F6.3 mag V-R ? Phot98 project (V-R) color index
30- 35 F6.3 mag V-I ? Phot98 project (V-I) color index
38- 43 F6.3 mag Vmag1 ? Phot03 project V band magnitude
45- 50 F6.3 mag B-V1 ? Phot03 project (B-V) color index
53- 58 F6.3 mag Vmag2 ? Rosvick & Vandenberg (1998AJ....115.1516R 1998AJ....115.1516R)
V band magnitude
60- 65 F6.3 mag B-V2 ? Rosvick & Vandenberg (1998AJ....115.1516R 1998AJ....115.1516R)
(B-V) color index
68- 73 F6.3 mag Vmag3 ? Kalirai et al. (2001AJ....122..266K 2001AJ....122..266K)
V band magnitude
75- 80 F6.3 mag B-V3 ? Kalirai et al. (2001AJ....122..266K 2001AJ....122..266K)
(B-V) color index
83- 88 F6.3 mag Jmag ? 2MASS J band magnitude
90- 95 F6.3 mag J-Ks ? 2MASS (J-Ks) color index
99-102 I4 --- A74 ? Auner (1974A&AS...13..143A 1974A&AS...13..143A) identification,
in Simbad
106-108 I3 --- S72 ? Sanders (1972A&A....19..155S 1972A&A....19..155S) identification,
<[S72b] NGC 6819 NNN> in Simbad
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Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I06 --- WOCS WIYN Open Cluster Study identification (G1)
8- 9 I2 h RAh Hour of Right Ascension (J2000)
11- 12 I2 min RAm Minute of Right Ascension (J2000)
14- 18 F5.2 s RAs Second of Right Ascension (J2000)
19 A1 --- DE- Declination sign
20- 21 I2 deg DEd Degree of Declination (J2000)
23- 24 I2 arcmin DEm Arcminute of Declination (J2000)
26- 29 F4.1 arcsec DEs Arcsecond of Declination (J2000)
31- 35 F5.2 mag Vmag Averaged V band magnitude
37- 40 F4.2 mag B-V Averaged B-V color index
42- 43 I2 --- N1 Number of WIYN RV measurements
45- 46 I2 --- N2 Number of CfA RV measurements
48- 54 F7.2 km/s RV Mean radial velocity
56- 60 F5.2 km/s e_RV Standard error of RV (1)
62- 67 F6.2 --- e/i ? external/internal error ratio (2)
69- 70 I2 % Mmb ? Calculated RV membership probability
72- 74 A3 --- bin Binarity classification (3)
76- 82 F7.3 km/s gamma ? Center-of-mass radial velocity γ
84-102 A19 --- Com Additional comment
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Note (1): If we only have a single measurement, the WIYN or CfA measurement
precision is given instead, as appropriate. For binaries with orbital
solutions, we provide the error on γ from the orbital fit in
this column instead.
Note (2): Where "e" is the standard deviation of the RV measurements for
the star, and "i" is our measurement precision.
Note (3): classifications codes as follows (section 6.3):
SM = single member
SN = single non-member
BM = binary member
BN = binary non-member
BLM = binary likely member
BLN = binary likely non-member
BU = binary with unknown membership
U = unknown
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Global notes:
Note (G1): Here, we introduce the WOCS numbering system, based on V magnitude
and radial distance from the cluster center. Separate one-dimensional
Gaussian fits in right ascension (RA) and declination (DE) to the cluster's
apparent density profile (for stars with membership probability p>50%)
provides the following new J2000 center 19:41:17.5+40:11:47.
Around this center, annuli of 30" width are drawn, and in each ring the stars
are sorted in increasing order of their V magnitudes (i.e., the brightest
stars have the lowest numbers). If a star is missing a measurement of its V
magnitude, it is estimated from the 2MASS catalog using the empirical
relationship defined above. The WOCS identification number is the three digit
star number followed by the three digit annulus number (e.g., the star 001003
is the brightest star in the third annulus).
Sources are identified as <[HGM2009b] WOCS NNNFFF> in Simbad.
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History:
From electronic version of the journal
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History:
* 28-Dec-2011: First online-version
* 28-Jan-2016: One sequential number corrected in table2
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 15-Nov-2011