J/AJ/148/38 WIYN open cluster study. LX. RV survey of NGC 6819 (Milliman+, 2014)
WIYN open cluster study. LX. Spectroscopic binary orbits in NGC 6819.
Milliman K.E., Mathieu R.D., Geller A.M., Gosnell N.M., Meibom S.,
Platais I.
<Astron. J., 148, 38 (2014)>
=2014AJ....148...38M 2014AJ....148...38M
ADC_Keywords: Clusters, open ; Binaries, spectroscopic ; Binaries, orbits ;
Radial velocities
Keywords: binaries: spectroscopic - blue stragglers -
open clusters and associations: individual: NGC 6819
Abstract:
We present the current state of the WOCS radial-velocity (RV) survey
for the rich open cluster NGC 6819 (2.5Gyr) including 93 spectroscopic
binary orbits with periods ranging from 1.5 to 8000days. These results
are the product of our ongoing RV survey of NGC 6819 using the Hydra
Multi-Object Spectrograph on the WIYN 3.5m telescope. We also include
a detailed analysis of multiple prior sets of optical photometry for
NGC 6819. Within a 1° field of view, our stellar sample includes
the giant branch, the red clump, and blue straggler candidates, and
extends to almost 2 mag below the main sequence (MS) turnoff. For each
star observed in our survey we present all RV measurements, the
average RV, and velocity variability information. Additionally, we
discuss notable binaries from our sample, including eclipsing binaries
(WOCS 23009, WOCS 24009, and WOCS 40007), stars noted in Kepler
asteroseismology studies (WOCS 4008, WOCS 7009, and WOCS 8007), and
potential descendants of past blue stragglers (WOCS 1006 and WOCS
6002). We find the incompleteness-corrected binary fraction for all MS
binaries with periods less than 104days to be 22%±3% and a tidal
circularization period of 6.2+1.1-1.1days for NGC 6819.
Description:
The WOCS radial velocity target sample for NGC 6819 has 3895 stars
that span 1° on the sky centered at RA=19h41m17.5s,
DE=+40°11'47'' (J2000). The details of our radial velocity survey
of NGC 6819 including the observing procedure, data reduction, and
membership classification are discussed in depth in Hole et al. 2009
(cat. J/AJ/138/159; Paper XXIV) and Geller et al. 2008 (cat.
J/AJ/135/2264; Paper XXXII).
Observations of NGC 6819 with the Hydra Multi-Object Spectrograph
(MOS) on the WIYN 3.5m telescope began in 1998 June and are still
ongoing. We have almost 14000 spectra for over 2600 stars. These
observations are augmented with 733 radial velocity measurements for
170 stars taken at the Harvard-Smithsonian Center for Astrophysics
(CfA) facilities between 1988 May and 1995 by R. D. Mathieu and D. W
Latham (Hole et al. 2009, cat. J/AJ/138/159; Paper XXIV).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 70 13936 Radial velocity measurements
table2.dat 97 2641 Radial velocity summary table
table5.dat 137 78 Orbital parameters for NGC 6819 single-lined binaries
table6.dat 181 15 Orbital parameters For NGC 6819 double-lined binaries
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See also:
J/AJ/146/43 : WIYN open cluster study. LV. NGC 6819 (Platais+, 2013)
J/ApJ/729/L10 : KIC stars properties in NGC 6791 and NGC 6819 (Basu+, 2011)
J/AJ/138/159 : NGC 6819 stellar radial-velocity and photometry (Hole+, 2009)
J/AJ/135/2264 : Stellar radial velocities in NGC 188 (Geller+, 2008)
J/MNRAS/358/795 : Variable stars in NGC 6819 field (Street+, 2005)
J/AJ/121/327 : Metal Abundances of Red Clump Stars in NGC6819
(Bragaglia+, 2001)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- WOCS [1001/260043] WIYN Open Cluster Study number (G1)
7 A1 --- m_WOCS [ab] Flag for eclipsing binary WOCS 24009 (G2)
9- 18 F10.4 d HJD Heliocentric Julian Date (HJD-2400000)
20 A1 --- Tel Telescope (C=CfA facilities; W=WIYN 3.5m)
22- 29 F8.3 km/s RV1 [-242.244/509.339] Primary radial velocity
31- 34 F4.2 --- CH1 ? Primary cross-correlation function height
36- 41 F6.2 km/s O-C1 [-10.29/13.79]? Primary radial velocity residual
43- 52 F10.5 km/s RV2 [-105.87/108.35]? Secondary radial velocity
54- 57 F4.2 --- CH2 ? Secondary cross-correlation function height
59- 64 F6.2 km/s O-C2 [-18.4/12.07]? Secondary radial velocity residual
66- 70 F5.3 --- Phase [0/1]? Orbital phase
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Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- WOCS [1001/260043] WIYN Open Cluster Study number (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)
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 ? The V band magnitude
37- 40 F4.2 mag V-I ? The (V-I) color index
42- 43 I2 --- NW [0/62] Number of WIYN 3.5m observations
45- 46 I2 --- NC [0/32] Number of CfA observations
48- 55 F8.3 km/s [-241.841/69.628] Mean radial velocity
57- 61 F5.2 km/s e_ Standard error in
63- 68 F6.2 --- e/i External error divided by internal error
70- 71 I2 % PRV [0/94]? Radial velocity membership probability
73- 74 I2 % PPM [0/99]? Proper-motion membership probability
76- 78 A3 --- Mm Membership class (1)
80- 87 F8.3 km/s RV ? Center-of-mass radial velocity (γRV)
89- 93 F5.3 km/s e_RV ? Error in gamma
95- 97 A3 --- SB Single, double- or triple-lined binary
(SB1, SB2 or SB3)
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Note (1): Class are defined as follows:
BLM = Binary Likely Member. Velocity-variable stars that do not have a
completed orbital solution, but PRV≥50% and PPM≥4%. Without a
completed orbital solution PRV is calculated from and this
classification is subject to change because observations are ongoing;
BLN = Binary Likely Non-member. Velocity-variable stars that do not have a
completed orbital solution. PPM<4% or the PRV is<50%. If PPM≥4% but
PRV<50%, the individual RVs do not cross the cluster mean, making it
unlikely that the orbital solution will place the star within the cluster
distribution. Without a completed orbital solution PRV is calculated from
and this classification is subject to change because observations
are ongoing;
BM = Binary Member. Velocity-variable stars that have a completed orbital
solution. PPM is ≥4% and PRV≥50%;
BN = Binary Non-member. Velocity-variable stars that have a completed orbital
solution. Either PPM<4% or PRV<50%;
BU = Binary Unknown. Velocity-variable stars that do not have a completed
orbital solution. PPM≥4% and PRV is <50%, plus the range of individual
RVs includes the cluster mean, making it more likely that the binary
could be a member. Without a completed orbital solution PRV is calculated
from and this classification is subject to change because
observations are ongoing;
SM = Single Member. Stars that have e/i<4, PRV≥50%, and PPM≥4%;
SN = Single Non-member. Stars that have e/i<4, and PRV<50% or PPM<4%.
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Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- WOCS [1001/77007] WIYN Open Cluster Study number (G1)
7- 17 F11.6 d Per [1.57469/7810] Orbital period
19- 28 F10.6 d e_Per The 1σ error in Per
30- 35 F6.1 --- Ncyc [1.1/2623.5] Number of orbital cycles observed
37- 40 F4.2 km/s RV Center-of-mass radial velocity (γ)
42- 45 F4.2 km/s e_RV The 1σ error in RV
47- 51 F5.2 km/s K [1.7/55.1] Orbital amplitude
53- 57 F5.2 km/s e_K The 1σ error in K
59- 63 F5.3 --- e [0/1] Eccentricity
65- 69 F5.3 --- e_e The 1σ error in e
71- 75 F5.1 deg omega Longitude of periastron ω
77- 81 F5.1 deg e_omega The 1σ error in omega
83- 90 F8.2 d T0 [48249/56244] An Heliocentric Julian Date of
periastron passage (HJD-2400000)
92- 97 F6.2 d e_T0 The 1σ error in T0
100-106 F7.3 Gm asini Projected semi-major axis (a sin i)
108-114 F7.3 Gm e_asini The 1σ error in asini
116-122 E7.3 Msun f(m) The mass function
124-129 E6.2 Msun e_f(m) The 1σ error in f(m)
131-134 F4.2 km/s sigma The rms residual velocity from the orbital
solution (σ)
136-137 I2 --- N [12/42] Number of radial velocity measurements
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- WOCS [4004/76004] WIYN Open Cluster Study number (G1)
6 A1 --- m_WOCS [b] Flag for eclipsing binary WOCS 24009 (G2)
8- 17 F10.6 d Per [3.18508/297.2] Orbital period
19- 26 F8.6 d e_Per The 1σ error in Per
28- 33 F6.1 --- Ncyc [14.5/1023.6] Number of orbital cycles observed
35- 38 F4.2 km/s RV Center-of-mass radial velocity (γ)
40- 43 F4.2 km/s e_RV The 1σ error in RV
45- 49 F5.2 km/s K1 [18.1/90] Orbital amplitude of the primary
51- 54 F4.2 km/s e_K1 The 1σ error in K1
56- 60 F5.1 km/s K2 [20/103.3] Orbital amplitude of the secondary
62- 64 F3.1 km/s e_K2 The 1σ error in K2
66- 70 F5.3 --- e [0/1] Eccentricity
72- 76 F5.3 --- e_e The 1σ error in e
78- 82 F5.1 deg omega Longitude of periastron ω
84- 88 F5.1 deg e_omega The 1σ error in omega
90- 97 F8.2 d T0 [51635.6/55064.8] An Heliocentric Julian Date
of periastron passage (HJD-2400000)
100-103 F4.2 d e_T0 The 1σ error in T0
105-110 F6.3 Gm asini1 Projected primary semi-major axis (a sin i)
112-116 F5.3 Gm e_asini1 The 1σ error in asini1
118-123 F6.3 Gm asini2 Projected secondary semi-major axis (a sin i)
125-129 F5.3 Gm e_asini2 The 1σ error in asini2
131-135 F5.3 Msun msini1 Projected primary mass (m sin3 i)
137-141 F5.3 Msun e_msini1 The 1σ error in msini1
143-147 F5.3 Msun msini2 Projected secondary mass (m sin3 i)
149-153 F5.3 Msun e_msini2 The 1σ error in msini2
155-159 F5.3 --- q [0.7/1.03] Mass ratio
161-165 F5.3 --- e_q The 1σ error in q
167-170 F4.2 km/s sig1 The rms residual velocity for the primary
from the orbital solution (σ)
172-175 F4.2 km/s sig2 The rms residual velocity for the secondary
from the orbital solution (σ)
177-178 I2 --- N1 [12/49] Number of radial velocity measurements
for the primary
180-181 I2 --- N2 [11/37] Number of radial velocity measurements
for the secondary
--------------------------------------------------------------------------------
Global notes:
Note (G1): This number is based on V magnitude and radial distance from the
cluster center. Full details can be found in Hole et al. 2009
(cat. J/AJ/138/159; Paper XXIV).
Note (G2): Flag for eclipsing binary defined as below:
a = The brightest source in the spectra of WOCS 24009;
b = The two very similar dimmer sources in the spectra of WOCS 24009.
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History:
From electronic version of the journal
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(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 16-Oct-2014