J/MNRAS/436/1343 Calibration of RAVE distances with Hipparcos (Francis, 2013)
Calibration of RAVE distances to a large sample of Hipparcos stars.
Francis C.
<Mon. Not. R. Astron. Soc. 436, 1343 (2013)>
=2013MNRAS.436.1343F 2013MNRAS.436.1343F
ADC_Keywords: Stars, nearby ; Stars, distances
Keywords: stars: statistics - Galaxy: kinematics and dynamics -
solar neighbourhood - Galaxy: structure
Abstract:
A magnitude limited population of 18808 Hipparcos stars is used to
calibrate distances for 52794 RAVE stars, including dwarfs, giants,
and pre-main sequence stars. I give treatments for a number of types
of bias affecting calculation, including bias from the non-linear
relationship between the quantity of interest (e.g., distance or
distance modulus) and the measured quantity (parallax or visual
magnitude), the Lutz-Kelker bias, and bias due to variation in density
of the stellar population. The use of a magnitude bound minimises the
Malmquist and the Lutz-Kelker bias, and avoids a measurement bias
because Hipparcos parallaxes are more accurate for brighter stars. The
calibration is applicable to stars in 2MASS when there is some way to
determine stellar class with reasonable confidence. For RAVE this is
possible for hot dwarfs and using log g. The accuracy of the
calibration is tested against Hipparcos stars with better than 2%
parallax errors, and by comparison of the RAVE velocity distribution
with that of Hipparcos, and is found to improve upon previous
estimates of luminosity distance. An estimate of the LSR from RAVE
data, (U0, V0, W0) = (14.9-1.7, 15.3-0.4, 6.9-0.1)km/s shows excellent
agreement with the current best estimate from XHIP. The RAVE velocity
distribution confirms the alignment of stellar motions with spiral
structure.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
dwarfs.dat 176 39514 Distances for RAVE dwarfs
oclasses.dat 176 13280 Distances for other classes stars
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See also:
III/265 : RAVE 3rd data release (Siebert+, 2011)
V/137 : Extended Hipparcos Compilation (XHIP) (Anderson+, 2012)
Byte-by-byte Description of file: dwarfs.dat oclasses.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- Name Target designation
18- 33 A16 --- RAVE RAVE designation (JHHMMSS.S+DDMMSS)
35- 50 A16 --- 2MASS 2MASS designation (Cat. II/246)
52- 63 F12.8 deg RAdeg Right ascension (J2000.0, Ep=J2000)
65- 76 F12.8 deg DEdeg Declination (J2000.0, Ep=J2000)
78- 86 F9.5 deg GLON Galactic longitude
88- 96 F9.5 deg GLAT Galactic latitude
98-101 I4 pc Rlum Luminosity distance
103-108 F6.1 mas/yr pmRA ? proper motion RA
110-115 F6.1 mas/yr pmDE ? proper motion DE
117-122 F6.1 km/s RV Heliocentric radial velocity
124-129 F6.3 mag Jmag 2MASS with correction for reddening
131-136 F6.3 mag Hmag 2MASS with correction for reddening
138-143 F6.3 mag Kmag 2MASS with correction for reddening
145-148 F4.2 [cm/s2] logg ? Surface gravity
150-155 F6.2 [Sun] [M/H] ? Metallicity
157-160 F4.2 [Sun] [a/Fe] ? α-elements enhancement [α/Fe]
162-165 A4 --- band Colour or stellar class (1)
167-171 A5 --- Qual Spectra quality flag (identifies possible
problems, blank if ok; detail in Cat. III/265)
173-176 F4.2 --- MASK [0/1]? MASK flag (unreliable spectrum if
MASK≤0.7, see Cat. III/265)
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Note (1): Colour band code as follows:
b = -0.1 < J-K≤ 0.2 (for dwarfs)
g = 0.2 < J-K≤ 0.35 (for dwarfs)
y = 0.35≤J-K< 0.45 (for dwarfs)
r = 0.45< J-K≤ 0.75 (for dwarfs)
RC = red clump giant (for oclasses)
TT&S = T-Tauri and subgiants (for oclasses)
PS&R = protostars and red giant branch (for oclasses)
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Acknowledgements:
Charles Francis, charles.e.h.francis(at)gmail.com
(End) Patricia Vannier [CDS] 03-Sep-2013