J/AJ/148/61 WIYN open cluster study. LIX. RVs of NGC 6791 (Tofflemire+, 2014)
WIYN open cluster study. LIX. Radial velocity membership of the evolved
population of the old open cluster NGC 6791.
Tofflemire B.M., Gosnell N.M., Mathieu R.D., Platais I.
<Astron. J., 148, 61 (2014)>
=2014AJ....148...61T 2014AJ....148...61T
ADC_Keywords: Clusters, open ; Radial velocities
Keywords: blue stragglers - open clusters and associations: individual: NGC 6791
Abstract:
The open cluster NGC 6791 has been the focus of much recent study due
to its intriguing combination of old age and high metallicity (∼8Gyr,
[Fe/H]=+0.30), as well as its location within the Kepler field. As
part of the WIYN Open Cluster Study, we present precise
(σ=0.38km/s) radial velocities for proper motion candidate
members of NGC 6791 from Platais et al. Our survey, extending down to
g' ∼ 16.8, is comprised of the evolved cluster population, including
blue stragglers, giants, and horizontal branch stars. Of the 280
proper-motion-selected stars above our magnitude limit, 93% have at
least one radial velocity measurement and 79% have three measurements
over the course of at least 200 days, sufficient for secure
radial-velocity-determined membership of non-velocity-variable stars.
The Platais et al. proper motion catalog includes 12 anomalous
horizontal branch candidates blueward of the red clump, of which we
find only 4 to be cluster members. Three fall slightly blueward of the
red clump and the fourth is consistent with being a blue straggler.
The cleaned color-magnitude diagram shows a richly populated red giant
branch and a blue straggler population. Half of the blue stragglers
are in binaries. From our radial velocity measurement distribution, we
find the cluster's radial velocity dispersion to be
σc=0.62±0.10km/s. This corresponds to a dynamical mass of
∼4600M☉.
Description:
Our observations utilize the Hydra Multi-Object Spectrograph (MOS) on
the WIYN 3.5m telescope. We use 3.1'' diameter fibers along with the
bench spectrograph echelle grating, resulting in a spectral resolution
of ∼20000 (15km/s). See Geller et al. 2008 (cat. J/AJ/135/2264; Paper
XXXII) for full details about our observing and data reduction
procedures. Variations in our methods from previous WIYN Open Cluster
Study (WOCS) radial velocity papers are given in Section 3.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 95 280 Radial velocity summary table
table2.dat 38 1162 Radial velocity data table
table4.dat 84 12 NGC 6791 blue horizontal branch (HB) proper
motion candidate members
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See also:
J/A+A/543/A106 : UBVRI photometry in NGC 6791 (Brogaard+, 2012)
J/ApJ/729/L10 : KIC stars properties in NGC 6791 and NGC 6819 (Basu+, 2011)
J/AJ/139/1383 : Radial velocities in M35 (NGC 2168) (Geller+, 2010)
J/AJ/135/2264 : Stellar radial velocities in NGC 188 (Geller+, 2008)
J/A+A/492/171 : VIc light curves of NGC 6791 V20 (Grundahl+, 2008)
J/A+A/471/515 : V light curves of NGC 6791 variable stars (De Marchi+, 2007)
J/AJ/129/2856 : Variable stars in NGC 6791 (Mochejska+, 2005)
J/PASP/115/413 : BVI photometry in the open cluster NGC 6791 (Stetson+, 2003)
J/A+AS/114/1 : CCD UBVI photometry of NGC 6791 (Kaluzny+, 1995)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- WOCS [1002/102050] WIYN Open Cluster Study number
8- 9 I2 h RAh Hour of Right Ascension (J2000) (G1)
11- 12 I2 min RAm Minute of Right Ascension (J2000) (G1)
14- 18 F5.2 s RAs Second of Right Ascension (J2000) (G1)
20- 21 I2 deg DEd Degree of Declination (J2000) (G1)
23- 24 I2 arcmin DEm Arcminute of Declination (J2000) (G1)
26- 29 F4.1 arcsec DEs Arcsecond of Declination (J2000) (G1)
31- 35 F5.2 mag g'mag The g' band magnitude (G1)
37- 40 F4.2 mag g'-r' The (g'-r') color index (G1)
42- 43 I2 --- Nobs [0/14] Number of radial velocity measurements
45- 52 F8.3 km/s ? Mean radial velocity
54- 55 I2 % Ppm [0/99] Proper motion membership probability (G1)
57- 58 I2 % Prv [0/99]? Radial velocity membership probability
59 A1 --- f_Prv [*] The probability remains uncertain until a
binary orbital solution is found
61- 66 F6.3 --- e/i ? Radial velocity standard deviation to radial
velocity precision ratio
68- 70 A3 --- Mmb Membership class (1)
72- 84 A13 --- Com Additional comment (G2)
86- 90 F5.1 km/s vsini ? Rotational velocity vsin(i) for rapidly
rotating star
92- 95 A4 --- --- [km/s]
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Note (1): Class defined as follows:
SM = radial velocity Single Member;
SN = radial velocity Single Non-member;
BLM = radial velocity Binary Likely Member;
BU = radial velocity Binary Unknown;
BLN = radial velocity Binary Likely Non-member;
U = Unknown membership.
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Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- WOCS [1002/102050] WIYN Open Cluster Study number
8- 15 F8.3 d HJD Heliocentric Julian Date (HJD-2450000)
17- 22 F6.1 km/s RV1 Primary radial velocity
24- 27 F4.2 --- CH1 [0/1] Correlation Height of primary
29- 33 F5.1 km/s RV2 ? Secondary radial velocity (1)
35- 38 F4.2 --- CH2 [0/1]? Correlation Height of secondary (1)
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Note (1): These columns are reserved for double-lined spectroscopic binaries
when a velocity and Fourier Cross-Correlation Functions (CCF) peak height
can be obtained for each star.
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Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- WOCS [2001/46008] WIYN Open Cluster Study number
7- 11 I5 --- P11 Number in Platais et al. (2011ApJ...733L...1P 2011ApJ...733L...1P)
13- 14 I2 h RAh Hour of Right Ascension (J2000) (G1)
16- 17 I2 min RAm Minute of Right Ascension (J2000) (G1)
19- 23 F5.2 s RAs Second of Right Ascension (J2000) (G1)
25- 26 I2 deg DEd Degree of Declination (J2000) (G1)
28- 29 I2 arcmin DEm Arcminute of Declination (J2000) (G1)
31- 34 F4.1 arcsec DEs Arcsecond of Declination (J2000) (G1)
36- 40 F5.2 mag g'mag The g' band magnitude (G1)
42- 45 F4.2 mag g'-r' The (g'-r') color index (G1)
47- 48 I2 % Ppm [0/99] Proper motion membership probability (G1)
50- 55 F6.2 km/s Mean radial velocity
57- 60 F4.2 km/s e_ 1σ error in
62- 63 I2 % Prv [0/99] Radial velocity membership probability
64 A1 --- f_Prv [*] The probability remains uncertain until a
binary orbital solution is found
66 A1 --- --- [S]
67- 71 I5 --- S03 ? Number in Stetson et al. 2003 (J/PASP/115/413)
73- 77 A5 --- K65 Identification in Kinman (1965ApJ...142..655K 1965ApJ...142..655K)
79- 84 A6 --- Com Additional comment (G2)
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Global notes
Note (G1): Photometry, coordinates, and proper-motion membership probabilities
come from I. Platais et al (2014, in preparation).
Note (G2): Abbreviations used in comments:
SB1 = single-lined Spectroscopic Binary;
SB2 = double-lined Spectroscopic Binary;
C2-band = Red Giant with molecular carbon feature; separate FCC template;
BSS = Blue Straggler Star;
RR = Rapidly Rotating star.
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History:
From electronic version of the journal
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(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 25-Nov-2014