J/AJ/151/152 WOCS. LXXI. Spectroscopy of 5 stars in NGC 6791 (Milliman+, 2016)
WIYN open cluster study. LXXI. Spectroscopic membership and orbits of NGC 6791
sub-subgiants.
Milliman K.E., Leiner E., Mathieu R.D., Tofflemire B.M., Platais I.
<Astron. J., 151, 152-152 (2016)>
=2016AJ....151..152M 2016AJ....151..152M (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, open ; Stars, giant ; Binaries, spectroscopic ;
Radial velocities
Keywords: binaries: spectroscopic - stars: evolution -
open clusters and associations: individual (NGC 6791)
Abstract:
In an optical color-magnitude diagram, sub-subgiants (SSGs) lie
redward of the main sequence and fainter than the base of the red
giant branch in a region not easily populated by standard
stellar-evolution pathways. In this paper, we present multi-epoch
radial velocities for five SSG candidates in the old and metal-rich
open cluster NGC 6791 (8Gyr, [Fe/H]=+0.30). From these data, we are
able to make three-dimensional kinematic membership determinations and
confirm four SSG candidates as likely cluster members. We also
identify three member SSGs as short-period binary systems and present
their orbital solutions. These are the first SSGs with known
three-dimensional kinematic membership, binary status, and orbital
parameters since the two SSGs in M67 studied by Mathieu et al. We also
remark on the other properties of these stars including photometric
variability, Hα emission, and X-ray luminosity. The membership
confirmation of these SSGs in NGC 6791 strengthens the case that SSGs
are a new class of nonstandard stellar evolution products, and that a
physical mechanism must be found that explains the evolutionary paths
of these stars.
Description:
Our target list of five Sub-SubGiants (SSG) candidates are those
identified in the proper-motion study of Platais et al.
(2011ApJ...733L...1P 2011ApJ...733L...1P).
We obtained spectra of these five SSG candidates beginning in 2014
July with the Hydra Multi-Object Spectrograph (MOS) on the
Wisconsin-Indiana-Yale-National Optical Astronomy Observatory (NOAO)
(WIYN) 3.5m telescope.
Our observations include three spectrograph setups covering three
different wavelength regions and resolutions. The first observations
have a spectral range of 5710-5950Å with R∼19000 and our second
observations have a spectral range from 6450 to 6830Å with R∼13000.
The third spectral range is the standard setup for the WOCS radial
velocity survey with a wavelength range from 5000 to 5250Å and
R∼16000.
In Table3, we note the observation date and spectral setup used for
each radial velocity measurement.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 53 5 Sub-SubGiant (SSG) candidates positions and
proper motions
table2.dat 73 5 Sub-SubGiant (SSG) candidates photometry and
other identifiers
table3.dat 45 76 Radial-velocity measurements
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See also:
J/AJ/148/61 : WOCS. LIX. RVs of NGC 6791 (Tofflemire+, 2014)
J/AJ/147/4 : HST photometry of 5 globular clusters (Ross+, 2014)
J/ApJ/770/98 : Chandra study of NGC 6791 (van den Berg+, 2013)
J/A+A/543/A106 : UBVRI photometry in NGC6791 (Brogaard+, 2012)
J/ApJ/729/L10 : KIC stars properties in NGC 6791 and NGC 6819 (Basu+, 2011)
J/A+A/525/A2 : Eclipsing binaries in NGC 6791 (Brogaard+, 2011)
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/133/1585 : Stromgren photometry in NGC 6791 (Anthony-Twarog+, 2007)
J/AJ/129/2856 : Variable stars in NGC 6791 (Mochejska+, 2005)
J/AJ/129/656 : Infrared photometry of NGC 6791 (Carney+, 2005)
J/PASP/115/413 : BVI photometry in the open cluster NGC 6791 (Stetson+, 2003)
J/AJ/123/3460 : Low-amplitude variables in NGC 6791 (Mochejska+, 2002)
J/A+AS/114/1 : CCD UBVI photometry of NGC 6791 (Kaluzny+, 1995)
J/AJ/108/585 : UBVI photometry of NGC 6791 (Montgomery+, 1994)
J/MNRAS/243/492 : BV Photometry of NGC 6791 (Kaluzny, 1990)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- WOCS [117020/170008] WIYN Open Cluster Study number
8- 9 I2 h RAh Hour of Right Ascension (J2000) (1)
11- 12 I2 min RAm Minute of Right Ascension (J2000) (1)
14- 18 F5.2 s RAs Second of Right Ascension (J2000) (1)
20 A1 --- DE- Sign of the Declination (J2000) (1)
21- 22 I2 deg DEd Degree of Declination (J2000) (1)
24- 25 I2 arcmin DEm Arcminute of Declination (J2000) (1)
27- 30 F4.1 arcsec DEs Arcsecond of Declination (J2000) (1)
32- 35 F4.2 mas/yr pmX [0.41/0.87] Proper motion along X axis
(µx) (1)
37- 40 F4.2 mas/yr e_pmX [0.1/0.27] The 1σ uncertainty in pmX (1)
42- 45 F4.2 mas/yr pmY [1.03/1.92] Proper motion along Y axis
(µy) (1)
47- 50 F4.2 mas/yr e_pmY [0.09/0.15] The 1σ uncertainty in pmY (1)
52- 53 I2 % Ppm [80/99] Proper motion membership probability
(Pµ) (1)
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Note (1): From Platais et al. (2011ApJ...733L...1P 2011ApJ...733L...1P).
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Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- WOCS [117020/170008] WIYN Open Cluster Study number
8- 12 F5.2 mag g' [18.63/18.95] The g' band magnitude (1)
14- 17 F4.2 mag g'-r' [1.01/1.22] The g'-r' color index (1)
19- 23 F5.2 mag Vmag [17.65/18.3] The V band magnitude (2)
25- 28 F4.2 mag B-V [1.15/1.35]? The B-V color index (2)
31- 34 F4.2 mag V-I [1.29/1.53] The V-I color index (2)
36- 42 F7.4 d Per [5.8/11.5]? Period for sub-subgiant binary (3)
44- 49 F6.4 d e_Per [0.0008/0.007]? Error in Per (3)
51- 73 A23 --- OName Other name(s) (4)
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Note (1): The g'r' photometry is from Platais et al. (2011ApJ...733L...1P 2011ApJ...733L...1P).
Note (2): The BVI photometry is from Stetson et al. 2003 (cat. J/PASP/115/413 ).
Note (3): From Table5 in the paper.
Note (4): Identifier preceded by the prefix:
S = Stetson et al. 2003 (cat. J/PASP/115/413);
CX = van den Berg et al. 2013 (cat. J/ApJ/770/98);
Other identifiers = de Marchi et al. 2007 (cat. J/A+A/471/515).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- WOCS [117020/170008] WIYN Open Cluster Study number
8- 17 F10.4 d HJD Heliocentric Julian Date of observation
(HJD-2400000)
19 I1 --- W [1/3] Spectral setup (wavelength range:
1=5710-5950Å, 2=6450-6830Å, 3=5000-5250Å)
21- 25 F5.1 km/s RV [-78/-12.5] Radial velocity
27- 29 F3.1 km/s e_RV [0.8/5.8] RV measurement error (1)
31- 34 F4.2 --- Corr [0.23/0.79] Correlation height
36- 40 F5.2 km/s O-C [-3.27/4.48]? The O-C residual
42- 45 F4.2 --- Phase [0.01/1]? Phase
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Note (1): Error output by fxcor. These errors are computed based on the fitted
peak height and width, and the asymmetric noise of the Cross-Correlation
Function (CCF).
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History:
From electronic version of the journal
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(End) Sylvain Guehenneux [CDS] 19-Jul-2016