J/AJ/142/146 Radial Velocities of Galactic O-type stars I. (Williams+, 2011)
Radial velocities of Galactic O-type stars.
I. Short-term constant velocity stars.
Williams S.J., Gies D.R., Hillwig T.C., McSwain M.V., Huang W.
<Astron. J., 142, 146 (2011)>
=2011AJ....142..146W 2011AJ....142..146W
ADC_Keywords: Stars, O ; Radial velocities ; Rotational velocities ;
Effective temperatures ; Spectral types
Keywords: Stars: massive
Abstract:
We present radial velocities for 18 Galactic O-type stars. These stars
display small radial velocity scatter over timescales of one to two
weeks. Some of them are long-period binaries while others are probably
single stars. By fitting model spectra to our observed spectra we
obtain estimates for effective temperature, log g, rotational
velocity, and average radial velocity for each target.
Description:
The first sets of spectroscopic data were obtained from 2004 January
13 to 29, May 27 to June 8, and 2006 January 17 to February 2
with the Cerro Tololo Inter-American Observatory (CTIO) 1.5m
telescope and RC spectrograph. The 2006 data were obtained over time
with the SMARTS Consortium. The produced spectra covering the range
4058-4732Å with an FWHM resolving power of R∼2750.
Six of the stars were observed with the Kitt Peak National Observatory
(KPNO) 2.1m telescope during an observing run from 2008 November 15 to
21 UT. The wavelength range of the spectra is 3942-5032Å with an
FWHM resolving power of R=3030.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 31 233 Radial velocity measurements
table2.dat 98 18 Individual stellar parameters
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See also:
III/84 : Galactic O Stars (Cruz-Gonzalez+ 1974)
II/82 : Galactic O-type Stars (Garmany+ 1982)
V/116 : Galactic O star catalog (Maiz-Apellaniz+, 2004)
III/252 : Pulkovo radial velocities for 35493 HIP stars (Gontcharov, 2006)
III/254 : 2nd Cat. of RVs with Astrometric Data (Kharchenko+, 2007)
J/A+A/437/467 : VLT-FLAMES survey of massive stars (Evans+, 2005)
J/AJ/137/3358 : Speckle interferometry of massive stars (Mason+, 2009)
J/other/Sci/337.444 : RV curves of Galactic massive O stars (Sana+, 2012)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name Star name
13- 20 F8.3 d HJD Heliocentric Julian Date (HJD-2450000)
22- 26 F5.1 km/s HRV Radial velocity
28- 31 F4.1 km/s e_HRV Uncertainty in HRV
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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- 11 A11 --- Name Star name
13 I1 --- r_SpT1 Reference for SpT1 (1)
15- 30 A16 --- SpT1 MK spectral classification
32- 35 F4.1 kK Teff Effective temperature
37- 39 F3.1 kK e_Teff Teff uncertainty
41- 44 F4.2 [cm/s2] logg Surface gravity
46- 49 F4.2 [cm/s2] e_logg logg uncertainty
51- 53 I3 km/s vsini Projected rotational velocity
55- 56 I2 km/s e_vsini vsini uncertainty
58- 65 A8 --- SpT2 MK spectral classification from (Teff,
log g) (2)
66 A1 --- f_SpT2 Flag on SpT2 (3)
68- 72 F5.1 km/s Average radial velocity
74- 76 F3.1 km/s sigI Internal uncertainty (4)
78- 81 F4.1 km/s sigE External uncertainty (5)
83- 84 I2 --- N Number of measurements
86- 88 F3.1 --- Exc Ratio σEC/σI (6)
90- 93 A4 --- pVar Spectroscopic variability previous status (7)
95- 98 A4 --- cVar Spectroscopic variability current status (7)
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Note (1): Reference as follows:
1 = Massey et al., 2001AJ....121.1050M 2001AJ....121.1050M
2 = Massey & Johnson, 1993, Cat. J/AJ/105/980
3 = Walborn N.R., 1973AJ.....78.1067W 1973AJ.....78.1067W
4 = MacConnell & Bidelman, 1976AJ.....81..225M 1976AJ.....81..225M
5 = Walborn et al., 2010ApJ...711L.143W 2010ApJ...711L.143W
6 = Garrison et al., 1977ApJS...35..111G 1977ApJS...35..111G
Note (2): Calibration of Martins et al., (2005A&A...436.1049M 2005A&A...436.1049M).
Note (3): Flags as follows:
b = Unable to estimate, too cool for the calibration of Martins et al.
(2005A&A...436.1049M 2005A&A...436.1049M).
c = Unable to estimate, stellar parameters not accurate; see the text.
Note (4): The "internal" uncertainty, σI, is the average of the
uncertainties of individual measurements. This gives us an idea of the
measurement errors from the data set as a whole.
Note (5): The "external" uncertainty, σE, is the standard deviation of
the velocity measurements. This value characterizes the
spectrum-to-spectrum variations of the data set.
Note (6): The excess external scatter due to stellar variability may be
estimated by σEC2=σE2-σλ2, and
we list the ratio σEC/σI.
Note (7): Our nomenclature is adopted from that of Table 4 of Mason et al.
(2009, Cat. J/AJ/137/3358), as follows:
C = constant
U = unknown spectroscopic variability
SB1? = single-lined spectroscopic variations but no orbit
SB2? = double-lined spectroscopic variations but no orbit.
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History:
From electronic version of the journal
References:
Williams et al. Paper II. 2013AJ....145...29W 2013AJ....145...29W
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 06-Mar-2013