J/other/RAA/10.541 Carbon star list (90<l<270, |b|<6) (Liu+, 2010)
Rotation curve of the Galactic outer disk derived from radial velocities and
UCAC3 proper motions of carbon stars.
Liu J.-C., Zhu Z.
<Res. Astron. Astrophys., 10, 541-552 (2010)>
=2010RAA....10..541L 2010RAA....10..541L
ADC_Keywords: Galaxies, rotation ; Stars, carbon
Keywords: astrometry - Galaxy: disk - Galaxy: kinematics and dynamics -
stars: carbon
Abstract:
The availability of astrometric data and radial velocities of carbon
stars near the Galactic plane enables us to investigate the kinematics
of the Milky Way, especially the rotation curve. The recently
published Third U.S. Naval Observatory CCD Astrograph Catalog (UCAC3)
provides the opportunity to test this problem using three-dimensional
velocity in order to obtain more reliable rotation curves. We intend
to study the Galactic rotation curve up to 15kpc using the radial
velocities and proper motions of carbon stars. The motivation for
using UCAC3 is to provide high precision proper motions which have
hardly been used in determining the rotation velocity of tracers.
Seventy-four carbon stars and carbon-rich Mira variables toward the
anti-center direction (90°<l<270°, |b|<6°) are picked up
from the literature then matched with UCAC3 carbon star candidates to
obtain their proper motions. A rigorous geometrical method is employed
to compute the rotation velocity of each object. Taking carbon stars
as tracers, we find a flat rotation curve of 210±12km/s assuming
R0=8.0kpc for the galactocentric distance and V0=220km/s for the
rotation velocity of the Sun. Due to the uncertainties of distances,
the rotation velocities are more dispersed if tangential velocities
enter the calculation, compared to those derived from radial
velocities only. However, the whole rotation curve shows coherence
with previous results. Increasing observation and study of carbon
stars would be desirable in order to provide more homogeneous data for
the kinematical study of the Galactic disk.
Description:
Carbon Star List (90°<l<270°, |b|<6°) obtained from
UCAC3, Cat. I/315, and Demers & Battinelli, 2007, Cat.
J/A+A/473/143; Groenewegen et al., 2002, Cat. J/A+A/390/511, and
Menzies et al., 2006, Cat. J/MNRAS/369/783.
Table 1 exhibits the resulting C stars with measurements of positions,
helio centric distance, radial velocities and UCAC3 proper motions.
The list contains 74 objects which have K magnitudes between 2.2 and
12.6, 51 in the south and 23 in the north.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 78 74 Carbon star list (90°<l<270°, |b|<6°)
table2.dat 56 40 Carbon star list (90°<l<270°,
3°<|b|<6°)
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See also:
I/315 : UCAC3 Catalogue (Zacharias+ 2009)
III/227 : General Catalog of galactic Carbon stars, 3d Ed. (Alksnis+ 2001)
J/A+A/473/143 : C stars near Galactic plane radial velocities (Demers+, 2007)
J/A+A/390/511 : Carbon stars millimetre observations. II. (Groenewegen+ 2002)
J/MNRAS/369/783 : Carbon stars radial velocities + distances (Menzies+, 2006)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq [1/74] Sequential number of source
4- 18 A15 --- Name Name of carbon star
19- 33 A15 --- Name2 Second name of carbon star
35- 41 F7.3 deg RAdeg Right ascension in decimal degrees, J2000
43- 49 F7.3 deg DEdeg Declination in decimal degrees, J2000
51- 55 F5.2 kpc d Heliocentric distance of stars
57- 63 F7.3 mas/yr pmGlon Proper motion along galactic longitude
65- 71 F7.3 mas/yr pmGlat Proper motion along galactic latitude
73- 78 F6.1 km/s RV Radial velocity
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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- 2 I2 --- Seq [1/40] Sequential number of source
4- 7 I4 --- CGCS Running number in the CGCS3, Cat. III/227
10- 14 I5 --- GCRV ? Running number in Wilson, Cat. III/21
16- 20 I5 --- CRVAD-2 ? Running number in CRVAD-2, Cat. III/254
22- 28 F7.3 deg RAdeg Right ascension in decimal degrees, J2000
30- 36 F7.3 deg DEdeg Declination in decimal degrees, J2000
38- 42 F5.3 mag Kmag K magnitude
44- 48 F5.3 mag E(B-V) Reddenning correction
50- 54 F5.3 mag AK Extinction in K-band
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Acknowledgements:
Editorial Office staff of RAA, xhli(at)nao.cas.cn
(End) Patricia Vannier [CDS] 05-Jul-2010