J/PASP/118/1656 Secondary velocity standards at NGP (Stefanik+, 2006)
Constant-velocity stars at the North Galactic Pole suitable for use as
secondary velocity standards.
Stefanik R.P., Latham D.W., Davis R.J.
<Publ. Astron. Soc. Pac., 118, 1656-1665 (2006)>
=2006PASP..118.1656S 2006PASP..118.1656S
ADC_Keywords: Galactic pole, north ; Stars, standard ; Radial velocities
Abstract:
We present mean radial velocities for 143 stars in Selected Area 57 at
the north Galactic pole that are suitable for use as secondary
velocity standards. The stars were drawn from a magnitude-limited
sample and are mostly fainter than 11th magnitude in V. They span a
wide range of effective temperatures and surface gravities and thus
provide a suitable source of targets for observed templates. The mean
radial velocities are based on at least 10 observations spanning at
least 8200 days, and are accurate typically to 0.2km/s, with no
obvious signs of variable velocity or composite spectra.
Description:
The radial velocities for our sample have been obtained with the CfA
digital speedometers. Three nearly identical spectrographs have been
used on the MMT and the 1.5m Tillinghast reflector at the F.L.
Whipple Observatory, Mount Hopkins, Arizona, and the 1.5m Wyeth
reflector at the Oak Ridge Observatory, Harvard, Massachusetts. The
echelle spectrographs, with photon-counting intensified Reticon
detectors, record about 45Å of spectrum in a single order centered
at 5187Å. The spectral resolution is about 8.5km/s, and the
signal-to-noise ratios range from 7 to 50 per resolution element.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 92 143 Target list and adopted template parameters
notes.dat 100 22 Notes
table2.dat 55 2694 Heliocentric radial velocities
table3.dat 75 143 Mean velocities and errors
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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- 6 A6 --- Name Weistrop star name (WNNNN, Weis NNNN in Simbad)
7 A1 --- n_Name [b-x] Note on Name, in notes.dat files
9- 10 I2 h RAh Right ascension (J2000)
12- 13 I2 min RAm Right ascension (J2000)
15- 20 F6.3 s RAs Right ascension (J2000)
22 A1 --- DE- Declination sign (J2000)
23- 24 I2 deg DEd Declination (J2000)
26- 27 I2 arcmin DEm Declination (J2000)
29- 33 F5.2 arcsec DEs Declination (J2000)
35- 40 F6.1 mas/yr pmRA Proper motion along RA
42- 47 F6.1 mas/yr pmDE Proper motion along DE
49- 53 F5.2 mag Vmag V magnitude
54 A1 --- n_Vmag [ac] Photoelectric (a) or Photographic (c)
56- 59 F4.2 mag B-V ? B-V colour index
61- 65 F5.2 mag Jmag J magnitude
67- 70 F4.2 mag J-K J-K colour index
72- 75 F4.2 mag V-K V-K colour index
77- 92 A16 --- Template Template name
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1 A1 --- Note Note code
3-100 A98 --- Text Text of the note
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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- 6 A6 --- Name Weistrop star name (WNNNN, Weis NNNN in Simbad)
8- 9 I2 h RAh Right ascension (J2000)
11- 12 I2 min RAm Right ascension (J2000)
14- 17 F4.1 s RAs Right ascension (J2000)
19 A1 --- DE- Declination sign (J2000)
20- 21 I2 deg DEd Declination (J2000)
23- 24 I2 arcmin DEm Declination (J2000)
26- 27 I2 arcsec DEs Declination (J2000)
29- 41 F13.5 d HJD Heliocentric Julian date
43- 49 F7.3 km/s HRV Heliocentric radial velocity
51- 55 F5.3 km/s e_HRV rms uncertainty on HRV
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Name Weistrop star name (WNNNN, Weis NNNN in Simbad)
8- 10 I3 --- Nobs Number of observations
12- 15 I4 d Span Time span of the observation
17- 20 F4.1 km/s vsini Projected rotational velocity
22- 27 F6.2 km/s RV Mean radial velocity
29- 32 F4.2 km/s e_RV rms uncertainty on RV
34- 37 F4.2 km/s extErr External error on RV
39- 42 F4.2 km/s intErr Internal error on RV
44- 47 F4.2 --- Ext/Int Ratio of external-to-internal error on HRV
49- 54 F6.2 --- chi2 Chi2 value
56- 63 F8.6 --- P(chi2) Probability of Chi2
65- 69 F5.2 --- Mean R value, a measure of the fit between the
observed spectra and the adopted template
71- 75 F5.3 --- <Corr> Average peak value of the correlation
coefficient
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 11-Jan-2008