J/A+A/323/775 Cepheids radial velocities and coordinates (Mishurov+ 1997)
Is the Sun located near the corotation circle?
Mishurov Yu.N., Zenina I.A., Dambis A.K., Mel'nik A.M., Rastorguev A.S.
<Astron. Astrophys. 323, 775 (1997)>
=1997A&A...323..775M 1997A&A...323..775M (SIMBAD/NED BibCode)
ADC_Keywords: Radial velocities
Keywords: Galaxy: kinematics and dynamics ; structure - Cepheids
Abstract:
The line-of-sight velocity field of Cepheids was analysed in terms of
a disk galaxy model perturbed by spiral density waves in order to
estimate the parameters of the galactic rotation curve and the free
parameters of density waves. It was shown that: 1) the Sun is located
near the corotation circle because the angular rotation velocity of
the Galaxy {OMEGA}☉≃26.0km/s/kpc (Kerr & Lynden-Bell,
1986MNRAS.221.1023K 1986MNRAS.221.1023K; Dambis, Mel'nik & Rastorguev,
1995AL.....21..291D 1995AL.....21..291D) is close to that of the spiral pattern
{OMEGA}p≃28.1±2.0km/s/kpc and the corotation radius Rc≃7.
2±1.3kpc (we adopt the galactocentric distance of the Sun
R☉≃7.5kpc); 2) the spiral pitch angle i≃-6.8±0.7°; 3)
the Sun is at the spiral wave phase χ☉≃290±16°; 4)
Oort's constant A≃20.9±1.2km/s/kpc; the second term in the
expansion of the galactic rotation velocity is
R☉{OMEGA}☉_≃13.3±3.1km/s/kpc2^.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2 72 122 Cepheids radial velocities and
galactic coordinates
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Byte-by-byte Description of file: table2
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Bytes Format Units Label Explanations
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2- 4 I3 --- No Running number
9- 13 A5 --- Star Star's name
15- 17 A3 --- Const Constellation
22- 26 F5.1 deg GLON Galactic longitude
30- 34 F5.1 deg GLAT Galactic latitude
38- 43 F6.4 d Period Pulsation period
47- 50 F4.2 kpc Dist Distance of star from the Sun
54- 58 F5.1 km/s RV Radial (line-of-sight) velocities of star
61- 64 F4.1 km/s e_RV Standard errors of radial velocities
69- 72 A4 --- r_RV References (1)
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Note (1): Radial velocities are taken from :
GSRS - Gorynya et al. (1996AL.....22..198G 1996AL.....22..198G)
DMR - Dambis et al. (1995AL.....21..291D 1995AL.....21..291D)
PMB - Pont et al. (1994A&A...285..415P 1994A&A...285..415P)
CC - Caldwell & Coulson (1987AJ.....93.1090C 1987AJ.....93.1090C)
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Acknowledgements: Yu. N. Mishurov
References:
Gorynya, N.A., Samus, N.N., Rastorguev, A.S., Sachkov, M.E. 1996,
Astron. Letters, 22, 198.
Dambis, A.K., Mel'nik, A.M., Rastorguev, A.S. 1995, Astronomy Letters 21, 291
Pont F., Mayor M., Burki G. 1994, A&A 285, 415
Caldwell, J.A.R., Coulson, I.M. 1987, AJ 93, 1090
(End) Patricia Bauer [CDS] 21-Nov-1996