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J/AJ/115/635 Cepheid radial velocities (Metzger+ 1998)
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The shape and scale of Galactic rotation from Cepheid kinematics
Metzger M.R., Caldwell J.A.R., Schechter P.L.
<Astron. J. 115, 635 (1998)>
=1998AJ....115..635M (SIMBAD/NED BibCode)
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ADC_Keywords: Stars, variable ; Radial velocities
Keywords: Cepheids - Galaxy: fundamental parameters -
Galaxy: kinematics and dynamics - Galaxy: structure
Abstract:
A catalog of Cepheid variables is used to probe the kinematics of the
Galactic disk. Radial velocities are measured for eight distant
Cepheids toward l=300{deg}; these new Cepheids provide a particularly
good constraint on the distance to the Galactic center, R_0_. We model
the disk with both an axisymmetric rotation curve and one with a weak
elliptical component, and find evidence for an ellipticity of
0.043+/-0.016 near the Sun. Using these models, we derive
R_0_=7.66+/-0.32kpc and v_circ_=237+/-12km/s. The distance to the
Galactic center agrees well with recent determinations from the
distribution of RR Lyrae variables and disfavors most models with
large ellipticities at the solar orbit.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 32 45 Cepheid radial velocities, 1991 February
table5.dat 47 288 Cepheid data
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See also:
J/A+AS/108/9 : Cepheids fundamental parameters I. (Bersier+, 1994)
J/A+AS/108/25 : Cepeheids fundamental parameters II. (Bersier+, 1994)
J/A+A/318/416 : Classical Cepheids radial velocities + photometry (Pont+ 1997)
J/A+A/323/775 : Cepheids radial velocities and coordinates (Mishurov+ 1997)
Table 1: Radial velocity standards, 1991 February
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Star RV eps_f_ eps_V_ n
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HD 24331 26.6 1.7 1.3 3
HD 39194 16.4 1.7 0.8 4
HD 48381 40.1 1.5 0.5 4
HD 83443 27.4 1.2 0.7 6
HD 83516 43.3 1.2 1.5 7
HD 101266 21.5 1.3 1.5 6
HD 111417 -18.9 1.2 0.8 7
HD 176047 -41.5 1.3 0.6 5
CPD -43 2527 19.3 1.3 1.2 5
HD 74000 205.5 4.6 1.6 4
HD 140283 -171.2 3.2 3.6 3
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Notes: eps_f_ is the formal error in the velocity from the Fourier quotient
eps_V_={sigma}_v_/n^1/2^ is the standard error of the mean of the
individual measurements
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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 --- [CKS91] Caldwell et al. (1991AJ....101.1763C)
Cepheid designation
12- 22 F11.3 d JD Julian date
24- 28 F5.1 km/s RV Radial velocity
30- 32 F3.1 km/s e_RV rms uncertainty on RV
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Table 3: Gamma velocities of new Cepheids
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Cepheid {gamma} e_fit_ e_Mc_ xi2 Period (d)
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11447-6153 29.1 2.0 1.9 1.5 6.4282
11465-6209 0.9: 4.0 3.8 4.4 11.0984
11492-6257 6.7 1.6 2.5 0.5 3.6798
11521-6200 20.4 1.7 1.7 1.2 6.6039
12003-6213 2.3 1.8 2.2 1.1 9.1266
13190-6235 -31.7 2.2 3.2 1.9 10.1576
13240-6245 -29.9: 3.3 8.6 0.6 15.0598
13323-6224 -48.3 3.0 2.1 2.2 4.2424
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Notes: e_fit_ : formal error of the fit
e_MC_ : Additional error estimate, based on
a Monte Carlo simulation
xi2 : Reduced {chi}^2^
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Table 4: Calculated parameter for new Cepheids
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Capheid Amp(V) <K> e_<K>_ JD_V,max_ JD_K,max_ Period (d)
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11447-6153 0.65 10.092 0.013 2447962.97 2448337.43 6.4282
11465-6209 0.88 8.558 0.014 2447968.7 2448337.84 11.0984
11492-6257 0.62 10.649 0.009 2447959.80 2448336.00 3.6529
11521-6200 0.63 9.645 0.014 2447958.40 2448335.16 6.5763
12003-6213 0.72 9.125 0.012 2447958.67 2448339.86 9.0131
13190-6235 0.82 8.739 0.015 2447958.76 2448342.12 10.3001
13240-6245 1.21 7.618 0.022 2447966.94 2448337.60 15.2158
13323-6224 0.46 7.910 0.012 2447961.75 2448336.63 4.2424
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Notes: Amp(V) : amplitude (peak-to-peak) of the V-band light curves
JD : epochs of maximum light in both V and K
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Cepheid name
11- 15 F5.1 deg GLON Galactic longitude
17- 21 F5.1 deg GLAT Galactic latitude
23- 27 F5.1 km/s RV Radial velocity
29- 34 F6.4 [d] logP log of the period
36- 41 F6.3 mag <Vmag> Average V magnitude (1)
43- 47 F5.3 mag E(B-V) Reddening
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Note (1): Caldwell & Coulson, 1987AJ.....93.1090C, and references therein
Pont et al., 1994A&A...285..415P
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History: From AJ electronic version
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(End) Patricia Bauer [CDS] 17-Mar-1998