J/AJ/160/169 WOCS. LXXXII. Orbital parameters & RVs in NGC 7789 (Nine+, 2020)
WIYN open cluster study.
LXXXII. Radial-velocity measurements and spectroscopic binary orbits in the
open cluster NGC 7789.
Nine A.C., Milliman K.E., Mathieu R.D., Geller A.M., Leiner E.M.,
Platais I., Tofflemire B.M.
<Astron. J., 160, 169 (2020)>
=2020AJ....160..169N 2020AJ....160..169N
ADC_Keywords: Clusters, open; Stars, double and multiple;
Binaries, spectroscopic; Spectra, infrared; Radial velocities
Keywords: Binary stars ; Spectroscopic binary stars ; Close binary stars
Abstract:
We present an extensive time-series radial-velocity (RV) survey of
stars in the rich open cluster NGC7789 (1.6Gyr, [Fe/H]=+0.02). The
stellar sample lies within an 18' circular radius from the cluster
center (10pc in projection, or about 2core radii), and includes
giants, red clump stars, blue stragglers, red stragglers,
sub-subgiants, and main-sequence stars down to 1mag below the turnoff.
Our survey began in 2005 and comprises more than 9000 RV measurements
from the Hydra Multi-Object Spectrograph on the WIYN 3.5m telescope.
We identify 624 likely cluster members and present the orbital
solutions for 81 cluster binary stars with periods between 1.45 and
4200days. From the main-sequence binary solutions we fit a
circularization period of 7.2-1.1+0.6days. We calculate an
incompleteness-corrected main- sequence binary frequency of 31%±4%
for binaries with periods less than 104days, similar to other WIYN
Open Cluster Survey (WOCS) open clusters of all ages. We detect a blue
straggler binary frequency of 33%±17%, consistent with the
similarly aged open cluster NGC6819. We also find one secure, rapidly
rotating sub-subgiant and one red straggler candidate in our sample.
Description:
Our observations of NGC7789 began in 2005 January using the Hydra
Multi-Object Spectrograph (MOS) on the University of
Wisconsin-Madison, Indiana University, Yale University, and the
National Optical Astronomy Observatories (WIYN) 3.5m telescope. Our
spectra are typically taken in a wavelength range of ∼500Å centered
on 5125Å which encompasses the Mg B triplet and a rich array of
narrow metal lines. We conduct our observations at 11th order, which
yields a spectral resolution of ∼15000-20000 with a dispersion of
0.13Å/pix.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 62 8275 Radial-velocity measurements
table2.dat 116 1206 Radial-velocity summary table
table6.dat 138 60 Orbital parameters for NGC 7789 single-lined
binaries
table7.dat 141 42 Orbital parameters for NGC 7789 double-dined
binaries
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See also:
I/337 : Gaia DR1 (Gaia Collaboration, 2016)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/A+A/295/101 : Variable stars in field of NGC 7789 (Jahn+, 1995)
J/PASP/110/1172 : NGC 7789 radial velocities (Gim+, 1998)
J/PASP/110/1318 : NGC 7789 CCD VI photometry (Gim+, 1998)
J/AJ/118/2894 : UBVRI CCD photometry in NGC 188 (Sarajedini+, 1999)
J/AJ/126/2922 : Astrometry and membership in NGC 188 (Platais+, 2003)
J/AJ/135/2264 : Stellar radial velocities in NGC 188 (Geller+, 2008)
J/AJ/137/5086 : NGC 188 V12 VI light curves (Meibom+, 2009)
J/AJ/139/1383 : Radial velocities in M35 (NGC 2168) (Geller+, 2010)
J/A+A/511/A56 : Abundances of five open clusters (Pancino+, 2010)
J/ApJS/190/1 : A survey of stellar families (Raghavan+, 2010)
J/AJ/142/59 : Chemical abundance in 10 open clusters (Jacobson+, 2011)
J/AJ/146/43 : WIYN open cluster study. LV. NGC 6819 (Platais+, 2013)
J/AJ/148/38 : WIYN open cluster study.LX. RV of NGC6819 (Milliman+, 2014)
J/AJ/148/85 : WIYN open cluster study.LXII. Photo. of M35 (Thompson+,2014)
J/AJ/148/61 : WIYN open cluster study.LIX. RVs NGC6791 (Tofflemire+,2014)
J/AJ/150/97 : Radial velocities in M67. I. 1278 candidate (Geller+, 2015)
J/AJ/150/10 : WOCS. LXVI. Radial velocity survey in M35 (Leiner+, 2015)
J/AJ/149/15 : Spectroscopy of NGC 7789 (Overbeek+, 2015)
J/MNRAS/458/3150 : OCCASO survey. HRV for 12 open clusters (Casamiquela+, 2016)
J/AJ/151/152 : WOCS. LXXI. Spectro. of 5 stars in NGC 6791 (Milliman+,2016)
J/AJ/156/18 : APOGEE DR14:Binary comp. evolved stars (Price-Whelan+, 2018)
J/A+A/618/A93 : Gaia DR2 open clusters in Milky Way (Cantat-Gaudin+, 2018)
J/A+A/616/A10 : 46 open clusters Gaia HR diagrams (Gaia Collaboration, 2018)
J/AJ/158/163 : Li abundance values for stars in NGC 6819 (Deliyannis+,2019)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- ID [1001/72035] Identifier
7- 16 F10.4 d HJD [7565/58643] Heliocentric Julian Date, HJD-2400000
18- 23 F6.1 km/s RV1 [-162.5/101.5] Primary radial velocity
25- 34 F10.2 --- CH1 [0.4/5200000] Primary Correlation Height
36- 39 F4.1 km/s O-C1 [-8.6/9.8]? Primary residual
41- 46 F6.1 km/s RV2 [-171.7/71.1]? Secondary radial velocity
48- 51 F4.2 --- CH2 [0.14/0.9]? Secondary Correlation Height
53- 56 F4.1 km/s O-C2 [-8.6/9.8]? Secondary residual
58- 62 F5.3 --- Phase [0.002/0.998]? Orbital phase
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- ID [1001/107032] Identifier
8- 9 I2 h RAh [23] Hour of Right Ascension (J2000)
11- 12 I2 min RAm [55/59] Minute of Right Ascension (J2000)
14- 18 F5.2 s RAs Second of Right Ascension (J2000)
19 A1 --- DE- [+] Sign of declination (J2000)
20- 21 I2 deg DEd [56/57] 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 Gmag [7.43/14.99]? Gaia DR2 G band magnitude
37- 40 F4.2 mag GBP-GRP [0.28/4.36]? Gaia DR2 GBP-GRP color
42- 43 I2 --- N [1/49]? Number of observations
45- 50 F6.1 km/s RVel [-162.3/54.4]? Mean radial velocity
52- 55 F4.1 km/s e_RVel [0/45]? Standard uncertainty in <RVel>
57- 61 F5.1 --- e/i [0/112.5]? Eccentricity to inclination ratio
63- 64 I2 % PPM [0/99]? Proper-motion membership probability
66- 67 I2 % PRV [0/95]? Radial velocity membership probability
69- 75 A7 --- Class Membership classification
77- 83 F7.3 km/s gamma [-56.8/-51.2]? Center-of-mass velocity
85- 89 F5.3 km/s e_gamma [0.05/0.7]? Standard uncertainty in gamma
91-116 A26 --- Com Additional comment(s)
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Byte-by-byte Description of file: table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- ID [1006/47010] Identifier
8- 18 F11.6 d Porb [1.88/4190] Orbital period
20- 29 F10.6 d e_Porb [1e-05/230] The 1σ uncertainty in Porb
31- 36 F6.1 --- Cycle [0.9/1823] Number of orbital cycles observed
38- 43 F6.2 km/s gamma [-56.21/-51.4] Center-of-mass radial velocity
45- 48 F4.2 km/s e_gamma [0.05/0.5] Standard uncertainty in gamma
50- 54 F5.2 km/s K [2.5/58.4] Orbital amplitude
56- 59 F4.2 km/s e_K [0.07/5] The 1σ uncertainty in K
61- 65 F5.3 --- e [0.006/0.9] Eccentricity
67- 71 F5.3 --- e_e [0.003/0.16] The 1σ uncertainty in e
73- 77 F5.1 --- omega [6.0/348] Longitude of periastron
79- 83 F5.1 --- e_omega [0.7/120] The 1σ uncertainty in omega
85- 92 F8.2 d T0 [54180/58390] Heliocentric Julian Date of
periastron passage JD-2400000
94- 99 F6.2 d e_T0 [0.04/160] The 1σ uncertainty in T0
101-107 F7.3 10+6km asini [0.364/253] Projected semi-major axis
109-114 F6.3 10+6km e_asini [0.008/60] The 1σ uncertainty in asini
116-122 E7.2 Msun fm [0.00011/0.223] The mass function
124-129 E6.1 solMass e_fm [2e-05/0.1] The 1σ uncertainty in fm
131-134 F4.2 km/s sigma [0.14/1.99]? RMS residual velocity (1)
136-138 I3 --- Num [12/44]? Number of observations (2)
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Note (1): For the primary from the orbital solution.
Note (2): Used in the orbital solutions after excluding measurements where
the two velocities could not be resolved.
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Byte-by-byte Description of file: table7.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- ID [7003/40008] Identifier
7- 16 F10.6 d Porb [2.36601/191.64]? Orbital period
18- 25 F8.6 d e_Porb [6e-06/0.23]? The 1σ uncertainty in Porb
27- 32 F6.1 --- Cycle [8.6/1753]? Number of orbital cycles observed
34- 39 F6.2 km/s gamma [-56.5/-51.2]? Center-of-mass radial velocity
41- 44 F4.2 km/s e_gamma [0.08/0.7]? Standard uncertainty in gamma
46- 51 F6.2 km/s K [26.7/122.2] Orbital amplitude
53- 56 F4.2 km/s e_K [0.1/2.2] The 1σ uncertainty in K
58- 62 F5.3 --- e [0.007/0.573]? Eccentricity
64- 68 F5.3 --- e_e [0.002/0.04]? The 1σ uncertainty in e
70- 74 F5.1 --- omega [24/330]? Longitude of periastron
76- 79 F4.1 --- e_omega [0.5/50]? The 1σ uncertainty in omega
81- 89 F9.3 d T0 [54550/57123]? Heliocentric Julian Date of
periastron passage JD-2400000
91- 95 F5.3 d e_T0 [0.018/2]? The 1σ uncertainty in T0
97-102 F6.3 10+6km asini [2.199/65.5] Projected semi-major axis
104-108 F5.3 10+6km e_asini [0.014/1.7] The 1σ uncertainty in asini
110-114 F5.3 solMass msin3i [0.193/1.89] Projected mass
116-120 F5.3 solMass e_msin3i [0.005/0.114] The 1σ uncertainty in msin3i
122-126 F5.3 --- q [0.685/1.02]? Mass ratio
128-132 F5.3 --- e_q [0.006/0.05]? The 1σ uncertainty in q
134-137 F4.2 km/s sigma [0.25/7.68]? RMS residual velocity (1)
139-141 I3 --- Num [12/35]? Number of radial velocity measurements
(2)
--------------------------------------------------------------------------------
Note (1): For the primary from the orbital solution.
Note (2): Used in the orbital solutions after excluding measurements where
the two velocities could not be resolved.
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History:
From electronic version of the journal
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(End) Prepared by [AAS], Coralie Fix [CDS], 16-Nov-2020