J/AN/336/70 Velocities and proper motions of Galactic Cepheids (Mel'nik+, 2015)
Classical Cepheids in the Galactic outer ring R1R2'.
Mel'nik A.M., Rautiainen P., Berdnikov L.N., Dambis A.K., Rastorguev A.S.
<Astron. Nachrichten 336, 70 (2015)>
=2015AN....336...70M 2015AN....336...70M
ADC_Keywords: Milky Way ; Stars, variable ; Radial velocities ; Proper motions
Keywords: Galaxy: structure - Galaxy: kinematics and dynamics -
(stars: variables:) Cepheids - galaxies: spiral
Abstract:
The kinematics and distribution of classical Cepheids within ∼3 kpc
from the Sun suggest the existence of the outer ring R1R2' in the
Galaxy. The optimum value of the solar position angle with respect to
the major axis of the bar, theta_b, providing the best agreement
between the distribution of Cepheids and model particles is
thetab=37±13°. The kinematical features obtained for Cepheids
with negative Galactocentric radial velocity VR are consistent with
the solar location near the descending segment of the outer ring R2.
The sharp rise of extinction toward of the Galactic center can be
explained by the presence of the outer ring R1 near the Sun.
Description:
For every classical Cepheid we give its designation in the General
Catalog of Variable Stars (GCVS) (Samus at al., 2007, Cat. B/gcvs) or
in the All Sky Automated Survey (ASAS) (Pojmanski 2002, II/264), its
type (see GCVS description), fundamental period PF, intensity-mean
V-band magnitude , J2000 equatorial coordinates, Galactic
coordinates l and b, and heliocentric distance r. Table 1 also
gives the Cepheid line-of-sight velocities Vr (the so-called
γ-velocities), their uncertainties e_Vr and the references (1-6)
to the sources from which they are taken. The proper motions of
Cepheids were adopted from the new reduction of Hipparcos data (ESA
1997, Cat. I/239) by van Leeuwen (2007, Cat. I/311). Table 1 presents
proper motions pml and pmb, their uncertainties e_pml and
e_pmb and the corresponding Hipparcos catalog number HIP.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 135 674 Data for 674 classical Cepheids
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See also:
B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)
II/264 : ASAS Variable Stars in Southern hemisphere (Pojmanski+, 2002-05)
J/A+AS/143/211 : Galactic Cepheids BVRI photometry (Berdnikov+, 2000)
J/A+A/323/775 : Cepheids radial velocities and coordinates (Mishurov+ 1997)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/674] Running number
5- 13 A9 --- GCVS GCVS Identification
15- 27 A13 --- ASAS ASAS Identification J name (HHMMSS+DDMM.m)
29- 36 A8 --- Type Type of the variability
38- 42 F5.2 d PF [0.5/68.1] Fundamental period
44- 48 F5.2 mag <Vmag> ?=0 Mean magnitude in the V-band
50- 51 I2 h RAh Right ascension (J2000.0)
53- 54 I2 min RAm Right ascension (J2000.0)
56- 59 F4.1 s RAs Right ascension (J2000.0)
61 A1 --- DE- Declination sign (J2000.0)
62- 63 I2 deg DEd Declination (J2000.0)
65- 66 I2 arcmin DEm Declination (J2000.0)
68- 69 I2 arcsec DEs Declination (J2000.0)
71- 76 F6.2 deg GLON Galactic longitude
78- 83 F6.2 deg GLAT Galactic latitude
85- 88 F4.1 kpc r [0.1/27.7] Heliocentric distance
90- 95 F6.1 km/s HRV [-126/126]? Heliocentric Radial velocity
97-100 F4.1 km/s e_HRV [0.1/10]? rms uncertainty in HRV
102 I1 --- r_HRV ? Reference to the catalog of HRV (1)
104-109 F6.2 mas/yr pmGLON [-13/45]? Proper motion along longitude
111-116 F6.2 mas/yr pmGLAT [-20/14]? Proper motion along latitude
118-122 F5.2 mas/yr e_pmGLON [0.1/11.3]? rms uncertainty in pmGLON
124-128 F5.2 mas/yr e_pmGLAT [0.1/09.2]? rms uncertainty in pmGLAT
130-135 I6 --- HIP ? Star Hipparcos catalog number
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Note (1): The line-of-sight velocities of Cepheids (gamma-velocities) HVR are
taken from following sources:
1 = Metzger et al., 1991ApJS...76..803M 1991ApJS...76..803M, 1992AJ....103..529M 1992AJ....103..529M and
1998AJ....115..635M 1998AJ....115..635MR, Cat. J/AJ/115/635
2 = Gorynya et al., 1992SvAL...18..316G 1992SvAL...18..316G, 1998AstL...24..815G 1998AstL...24..815G (III/229),
and Gorynya & Rastorguev, 2014 (in preparation)
3 = Pont et al., 1994A&A...285..415P 1994A&A...285..415P and 1997A&A...318..416P 1997A&A...318..416P (J/A+A/318/416)
4 = Barbier-Brossat et al., 1994A&AS..108..603B 1994A&AS..108..603B (III/184)
5 = Malaroda et al., 2006 (III/249)
6 = Fernie et al, 1995IBVS.4148....1F 1995IBVS.4148....1F
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Acknowledgements:
Anna Melnik, anna(at)sai.msu.ru
(End) Anna Melnik [SAI, Russia], Patricia Vannier [CDS] 12-Jan-2015