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J/MNRAS/317/460 Kinematics of Mira stars (Feast+, 2000)
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Mira kinematics from Hipparcos data: a Galactic bar to beyond the Solar circle.
Feast M.W., Whitelock P.A.
<Mon. Not. R. Astron. Soc. 317, 460 (2000)>
=2000MNRAS.317..460F
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ADC_Keywords: Stars, variable ; Space velocities ; Radial velocities ;
Rotational velocities ; Magnitudes
Keywords: catalogues - stars: variables: other -
Galaxy: kinematics and dynamics - Galaxy: structure
Abstract:
The space motions of Mira variables are derived from radial
velocities, Hipparcos (<I/239>) proper motions and a period-luminosity
relation. The previously known dependence of Mira kinematics on the
period of pulsation is confirmed and refined. In addition, it is found
that Miras with periods in the range 145-200d in the general Solar
neighbourhood have a net radial outward motion from the Galactic
Centre of 75+/-18km/s. This, together with a lag behind the circular
velocity of Galactic rotation of 98+/-19km/s, is interpreted as
evidence for an elongation of their orbits, with their major axes
aligned at an angle of ~17{deg} with the Sun-Galactic Centre line,
towards positive Galactic longitudes. This concentration seems to be a
continuation to the Solar circle and beyond of the bar-like structure
of the Galactic bulge, with the orbits of some local Miras probably
penetrating into the bulge. These conclusions are not sensitive to the
distance scale adopted. A further analysis is given of the
short-period (SP) red group of Miras discussed in companion papers in
this series. In Appendix A the mean radial velocities and other data
for 842 oxygen-rich Mira-like variables are tabulated. These
velocities were derived from published optical and radio observations.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 34 842 Star positions (from Simbad)
table1.dat 78 177 Individual space velocities
tablea2.dat 113 842 Radial velocities
refs.dat 103 74 References
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See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Star name
12- 13 I2 h RAh Right ascension (J2000.0)
15- 16 I2 min RAm Right ascension (J2000.0)
18- 21 F4.1 s RAs Right ascension (J2000.0)
23 A1 --- DE- Declination sign (J2000.0)
24- 25 I2 deg DEd Declination (J2000.0)
27- 28 I2 arcmin DEm Declination (J2000.0)
30- 31 I2 arcsec DEs Declination (J2000.0)
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1 A1 --- SP [ab] a: not short-period-red stars
b: short-period-red stars
3 I1 --- Group Group number
5- 14 A10 --- Name Star name
16- 21 F6.1 km/s Uvel U velocity
23- 28 F6.1 km/s Vvel V velocity
30- 35 F6.1 km/s Wvel W velocity
37- 42 F6.1 km/s RV Radial velocity
44- 48 F5.1 km/s Vrot Rotational velocity
50- 54 F5.1 km/s e_Uvel rms uncertainty on Uvel
56- 60 F5.1 km/s e_Vvel rms uncertainty on Vvel
62- 66 F5.1 km/s e_Wvel rms uncertainty on Wvel
68- 72 F5.1 km/s e_RV rms uncertainty on RV
74- 78 F5.1 km/s e_Vrot rms uncertainty on Vrot
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Star name
12- 14 I3 d Per Period
16- 19 A4 --- Var Variable type
21- 24 A4 --- SpType Spectral type
25- 28 I4 km/s RV Radial velocity
30- 33 F4.2 mag Kmag ? K magnitude
35- 53 A19 ---- Met Method used to derive velocity (1)
55-117 A63 --- r_Name References separated by commas
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Note (1): Methods:
Op: optical
H2O: H_2_O observations
SIO: SIO observations
CO: CO observations
OH: OH observations
SO: SO observations
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Ref Reference number
4- 22 A19 ---- BibCode BibCode
24- 57 A34 --- Aut Author's name
59-103 A45 --- Com Comments
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History: From MNRAS electronic version
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(End) James Marcout, Patricia Bauer [CDS] 16-Oct-2000