J/PAZh/39/942 Galactic classical Cepheids properties (Marsakov+, 2013)
Properties of the population of classical Cepheids in the Galaxy.
Marsakov V.A., Koval' V.V., Kovtyukh V.V., Mishenina T.V.
<Pis'ma Astron. Zh. 39, 942 (2013)>
=2013AstL...39..851M 2013AstL...39..851M
=2013PAZh...39..942M 2013PAZh...39..942M
ADC_Keywords: Stars, variable ; Abundances ; Space velocities
Keywords: Galaxy; kinematics and dynamics; structure - Cepheids
Abstract:
Based on our compiled catalogue of positions, velocities, ages, and
abundances of nine chemical elements for 221 classical Cepheids, we
analyze the dependences of the relative abundances of alpha-elements
as well as rapid and slow neutron capture elements on metallicity,
space velocity components, and Galactocentric distance.
Description:
We took the spatial positions, kinematic data, and periods for 276
classical Cepheids from the catalogue by Berdnikov et al. 2003
-J/MNRAS/428/3252). In this catalogue, the authors used accurate
equatorial coordinates of Cepheids from the Hipparcos Catalogue,
proper motions from the Tycho 2 Catalogue, radial velocities from
published sources, and determined the distances based on the
variability periods they obtained. Based on these data, we calculated
the rectangular coordinates x, y, z (directed toward the Galactic
center, in the direction of rotation, and toward the North Pole,
respectively), the total residual velocities relative to the local
standard of rest (LSR) VLSR, and the space velocity components VR,
Vθ, and VZ in cylindrical coordinates corrected for the
solar motion relative to the LSR.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 167 221 Catalogue of Galactic Cepheids
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See also:
J/MNRAS/428/3252 : Barium abundances in Cepheids (Andrievsky+, 2013)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Star Star name
13- 18 F6.2 deg GLON Galactic longitude
20- 25 F6.2 deg GLAT Galactic latitude
28- 32 F5.2 kpc Dist Heliocentric distance
35- 39 F5.2 kpc Xg X coordinate, directed toward Galactic center
42- 46 F5.2 kpc Yg Y coordinate, in direction of rotation
49- 53 F5.2 kpc Zg Z coordinate, toward the North Galactic pole
56- 60 F5.2 kpc Rgc Distance from Galactic center
63- 65 I3 km/s VLSR Velocities with respect to the
Local Standard of Rest
67- 70 I4 km/s VR Velocity component in the cylindrical
coordinate system, positive outward from star
73- 75 I3 km/s Vtet Velocity component in cylindrical coordinate
system, positive toward Galactic rotation
77- 80 I4 km/s Vz Velocity component in cylindrical coordinate
system
83- 85 I3 km/s e_Vt Mean standard error in tangential velocity
88- 90 I3 Gyr Age [20/205] Estimar star age
93- 97 F5.2 [Sun] [Fe/H] Metallicity, [Fe/H]
100-104 F5.2 [Sun] [O/Fe] ?=- Abundance ratio [O/Fe]
107-111 F5.2 [Sun] [Mg/Fe] ?=- Abundance ratio [Mg/Fe]
114-118 F5.2 [Sun] [Si/Fe] Abundance ratio [Si/Fe]
121-125 F5.2 [Sun] [Ca/Fe] Abundance ratio [Ca/Fe]
128-132 F5.2 [Sun] [Ba/Fe] ?=- Abundance ratio [Ba/Fe]
135-139 F5.2 [Sun] [La/Fe] ?=- Abundance ratio [La/Fe]
142-146 F5.2 [Sun] [Ce/Fe] ?=- Abundance ratio [Ce/Fe]
149-153 F5.2 [Sun] [Eu/Fe] ?=- Abundance ratio [Eu/Fe]
156-160 F5.2 [Sun] [a/Fe] ?=- Abundance of α elements
163-167 F5.2 [Sun] [s/Fe] ?=- Abundance of s-process elements
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Acknowledgements:
Vera Koval', litlevera(at)rambler.ru
(End) Patricia Vannier [CDS] 31-Mar-2014