J/AJ/136/118 Open clusters as galactic disk tracers. I. (Frinchaboy+, 2008)
Open clusters as galactic disk tracers.
I. Project motivation, cluster membership, and bulk three-dimensional
kinematics.
Frinchaboy P.M., Majewski S.R.
<Astron. J., 136, 118-145 (2008)>
=2008AJ....136..118F 2008AJ....136..118F
ADC_Keywords: Clusters, open ; Radial velocities ; Proper motions ; Photometry
Keywords: Galaxy: fundamental parameters - Galaxy: kinematics and dynamics -
Galaxy: structure - open clusters and associations: general
Abstract:
We have begun a survey of the chemical and dynamical properties of the
Milky Way disk as traced by open star clusters. In this first
contribution, the general goals of our survey are outlined and the
strengths and limitations of using star clusters as a Galactic disk
tracer sample are discussed. We also present medium-resolution
(R∼150000) spectroscopy of open cluster stars obtained with the Hydra
multi-object spectrographs on the Cerro Tololo Inter-American
Observatory 4m and WIYN 3.5m telescopes. Here we use these data to
determine the radial velocities of 3436 stars in the fields of open
clusters within about 3kpc, with specific attention to stars having
proper motions in the Tycho-2 catalog. Additional radial velocity
members (without Tycho-2 proper motions) that can be used for future
studies of these clusters were also identified.
Description:
We have collected homogeneous spectroscopic observations for 71 open
clusters using the HYDRA multi-fiber spectrographs on the Blanco 4m
telescope at Cerro Tololo Inter-American Observatory (CTIO) and the
3.5m WIYN telescope at Kitt Peak National Observatory (KPNO). This
project was conducted using publicly competed NOAO time and was
granted long-term status,6 which permitted observations in the
semesters 2002A-2004A over a total of 14 awarded CTIO 4m and six WIYN
3.5m nights.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 68 71 Dias et al. (2002, Cat. B/ocl) target cluster
properties
table4.dat 61 25 Comparison of RV standard star values for stars
in table2
table2.dat 86 199 *RV standard observations
table10.dat 121 3568 Cluster analysis
table11.dat 101 3536 2MASS (II/246) and Tycho-2 (I/259) photometry
for targeted cluster stars
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Note on table2.dat: HD12605 in original table, corrected into HD126053,
as in table4 of the paper.
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See also:
B/ocl : Optically visible open clusters and Candidates (Dias+ 2002-10)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
J/A+A/376/441 : Absolute proper motions of 112 open clusters (Dias+, 2001)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Cluster Cluster name
15- 16 I2 h RAh Hour of Right Ascension (J2000)
18- 19 I2 min RAm Minute of Right Ascension (J2000)
21- 22 I2 s RAs Second of Right Ascension (J2000)
24 A1 --- DE- Sign of the Declination (J2000)
25- 26 I2 deg DEd Degree of Declination (J2000)
28- 29 I2 arcmin DEm Arcminute of Declination (J2000)
31- 32 I2 arcsec DEs Arcsecond of Declination (J2000)
34- 41 F8.4 deg GLON Galactic longitude
43- 50 F8.4 deg GLAT Galactic latitude
52- 55 I4 pc Dist Distance
57- 61 F5.3 [yr] logAge Age
63- 64 I2 arcmin Diam Diameter
66- 68 A3 --- Run Run number(s) (1)
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Note (1): Run dates:
1 = 2002 March (CTIO)
2 = 2003 March (CTIO)
3 = 2003 June (CTIO)
4 = 2003 August (CTIO)
5 = 2003 September (WIYN)
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Star Star name
10- 20 A11 --- SpType Spectral type
21- 30 A10 "YYYY/MM/DD" Obs.Date Date of the observation
32- 36 F5.1 km/s RV Radial velocity
38- 40 F3.1 km/s e_RV Error in RV
43- 47 F5.1 km/s RVIAU ? IAU radial velocity
49- 51 F3.1 km/s e_RVIAU ? Uncertainty in RVIAU
52 A1 --- f_RVIAU [a] Indicates not IAU RV standard star (1)
54- 57 F4.1 km/s DRV Radial velocity difference
59- 61 F3.1 km/s e_DRV Error in DRV
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Note (1): Stars HR 675 and HR 7773 are not IAU standards. Due to the lack
of IAU standards hotter than F-type stars, we used stars from Fekel
(1999, Precise Stellar Radial Velocities (ASP Conf. Ser. 185)).
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 A10 "YYYY/MM/DD" Obs.Date Date of the observation
12- 19 A8 --- Star Star name
21- 31 A11 --- SpType Spectral type
33- 37 I5 --- Frame Frame number
39- 42 I4 --- Fiber Fiber number
44- 49 F6.2 --- TDR Tonry-Davis ratio
51- 56 F6.2 km/s RV Radial velocity
58- 61 F4.2 km/s e_RV Error in RV
63- 68 F6.2 km/s ? Mean radial velocity from that frame
70- 73 F4.2 km/s e_ ? Error in
75- 80 F6.2 km/s RVIAU ? IAU radial velocity
82- 84 F3.1 km/s e_RVIAU ? Uncertainty in RVIAU
86 A1 --- f_RVIAU [a] Indicates not an IAU RV standard star
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Byte-by-byte Description of file: table10.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Cluster Cluster name
15 A1 --- n_Name [M] star selected as cluster member
using the 3D criteria
17- 30 A14 --- Name Star name (G1)
32- 33 I2 h RAh Hour of Right Ascension (J2000)
35- 36 I2 min RAm Minute of Right Ascension (J2000)
38- 43 F6.3 s RAs Second of Right Ascension (J2000)
45 A1 --- DE- Sign of the Declination (J2000)
46- 47 I2 deg DEd Degree of Declination (J2000)
49- 50 I2 arcmin DEm Arcminute of Declination (J2000)
52- 57 F6.3 arcsec DEs Arcsecond of Declination (J2000)
59- 64 F6.1 mas/yr pmRA ? Proper motion along RA*cos(DE)
66- 68 F3.1 mas/yr e_pmRA ? Uncertainty in pmRA
70- 75 F6.1 mas/yr pmDE ? Proper motion along DE
77- 79 F3.1 mas/yr e_pmDE ? Uncertainty in pmDE
81- 87 F7.2 km/s RV Radial velocity
89- 93 F5.2 km/s e_RV Uncertainty in RV
95- 98 A4 --- n_RV Spectral template type ("Red" or "Blue") (2)
100-101 I2 % PDias ? Dias et al. membership probability (3)
103-107 F5.1 % PKc Proper motion membership probability
109-113 F5.1 % PVc Radial Velocity membership probability
115-119 F5.1 % Ptotc Joint membership probability
121 A1 --- Flag [d] Star not analyzed due to large
errors (see section 5.1)
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Note (2): Used in the cross-correlation for velocity determination, as
described in Section 3.3.
Note (3): Blank rows indicate star wasn't used in Dias et al. (2001,
Cat. J/A+A/376/441 and B/ocl) membership analysis.
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Byte-by-byte Description of file: table11.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Cluster Cluster name
15- 28 A14 --- Name Star name (G1)
30- 45 A16 --- 2MASS 2MASS identification (blank if no 2MASS match)
47- 48 I2 h RAh Hour of Right Ascension (J2000)
50- 51 I2 min RAm Minute of Right Ascension (J2000)
53- 57 F5.2 s RAs Second of Right Ascension (J2000)
59 A1 --- DE- Sign of the Declination (J2000)
60- 61 I2 deg DEd Degree of Declination (J2000)
63- 64 I2 arcmin DEm Arcminute of Declination (J2000)
66- 69 F4.1 arcsec DEs Arcsecond of Declination (J2000)
71- 75 F5.2 mag Bmag ? Tycho B band magnitude
77- 81 F5.2 mag Vmag ? Tycho V band magnitude
83- 87 F5.2 mag Jmag ? 2MASS J band magnitude
89- 93 F5.2 mag Hmag ? 2MASS H band magnitude
95- 99 F5.2 mag Ksmag ? 2MASS Ks band magnitude
101 A1 --- Mm [Y/N] A 3D member?
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Global Notes:
Note (G1): the format of the name is:
* the Tycho-2 name (Cat. I/259) if existing; otherwise
* of the form "XXXXf####" for candidates from GSC (Cat. I/220)
* of the form "XXXXu####" for candidates from USNO-B1.0 (Cat. I/284)
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 16-Jan-2011