J/A+A/562/A135 Northern Galactic OB stars vsini (Simon-Diaz+, 2014)
The IACOB project. I. Rotational velocities in northern Galactic O- and early
B-type stars revisited. The impact of other sources of line-broadening.
Simon-Diaz S., Herrero A.
<Astron. Astrophys., 562, A135-135 (2014)>
=2014A&A...562A.135S 2014A&A...562A.135S (SIMBAD/NED BibCode)
ADC_Keywords: Stars, early-type ; Rotational velocities ; Equivalent widths
Keywords: stars: early-type - stars: rotation - techniques: spectroscopic -
line: profiles - astronomical databases: miscellaneous
Abstract:
Stellar rotation is an important parameter in the evolution of massive
stars. Accurate and reliable measurements of projected rotational
velocities in large samples of OB stars are crucial to confront the
predictions of stellar evolutionary models with observational
constraints.
We reassess previous determinations of projected rotational velocities
(vsini) in Galactic OB stars using a large, high-quality spectroscopic
dataset and a strategy that accounts for other sources of
line-broadening in addition to rotation.
We present a versatile and user-friendly IDL tool - based on a
combined Fourier transform (FT) + goodness-of-fit (GOF) methodology -
for the line-broadening characterization in OB-type stars. We used
this tool to (a) investigate the impact of macroturbulent and
microturbulent broadenings on vsini measurements, and (b) determine
vsini and the size of the macroturbulent broadening (vm) in a sample
of ∼200 Galactic OB-type stars.
Description:
The spectroscopic observations considered for this study are part of
the IACOB spectroscopic database of northern Galactic OB stars (last
described in Simon-Diaz et al., 2011, Bull. Soc. Roy. Sci. Liege, 80,
514 and Stellar Clusters and Associations: Proc. A RIA Workshop on
Gaia, eds. E. J. Alfaro Navarro, A. T. Gallego Calvente, & M. R.
Zapatero Osorio, 255). This unique high-quality spectroscopic
database has been compiled in the framework of the IACOB project. To
date, the IACOB database comprises 1250 spectra of 153 and 97 Galactic
O- and early B-type stars, respectively, observable from the Roque de
los Muchachos observatory in La Palma (Spain). The spectra have a
resolving power of 46000 and 23000, a typical signal-to-noise
ratio (S/N) above 150, and were compiled between November 2008 and
January 2013 with the high-resolution FIbre-fed Echelle Spectrograph
(FIES) attached to the Nordic Optical Telescope (NOT). The IACOB
database has a multi-epoch character that enables investigations of
the binary/multiple nature of considered stars and the temporal
variations in individual objects with at least three spectra per
observed target. In this study, we only used a subsample of the
spectra, discarding all stars with signatures of multiplicity (which
means that we only considered apparently single and SB1 stars), and
only considering the spectrum with the highest S/N ratio per star.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tablea1.dat 57 42 Results from the IACOB-broad analysis of the
O- and B Supergiants (LC I)
tablea2.dat 57 51 Results from the IACOB-broad analysis of the
O- and B (bright) giants (LCs II and III)
tablea3.dat 57 46 Results from the IACOB-broad analysis of the
O dwarfs and subgiants (LC V and IV)
tablea4.dat 57 34 Results from the IACOB-broad analysis of the
B dwarfs and subgiants (LC V and IV)
tablea5.dat 57 26 Results from the IACOB-broad analysis of the
O and B stars identified as SB1
--------------------------------------------------------------------------------
See also:
III/6 : OB stars in Milky Way (Lynga, 1964)
V/31 : Kinematic data for O-B5 stars (Rubin+, 1962)
J/ApJ/454/151 : OB Associations of the Northern Milky Way (Massey+ 1995)
J/A+AS/118/481 : ROSAT all-sky survey catalogue of OB stars (Berghoefer+ 1996)
J/MNRAS/284/265 : Rotational Velocities of 373 OB stars (Howarth+ 1997)
J/A+AS/137/113 : Walraven photometry of OB stars (van Houten+, 1999)
J/A+A/369/527 : Walraven photometry of OB stars (van Houten, 2001)
J/ApJS/161/154 : Near-IR spectral atlas of OB stars (Hanson+, 2005)
J/A+A/597/A22 : Massive O- and B-type stars velocities (Simon-Diaz+, 2017)
J/A+A/613/A65 : Spectroscopic parameters of O-type stars (Holgado+, 2018)
J/A+A/613/A9 : Extinction towards Galactic O stars (Maiz Apellaniz+, 2018)
J/A+A/639/A157 : Massive O-type stars near ZAMS elusive detection
(Holgado+, 2020)
Byte-by-byte Description of file: tablea?.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Name Star name
12- 17 A6 --- SpType MK spectral (temperature) type
20- 29 A10 --- LC Luminosity class
31- 35 A5 --- Line Line name
39- 41 I3 0.1pm EW Line equivalent width (mÅ)
43- 45 I3 --- S/N Signal-to-noise ratio
47- 49 I3 km/s vsini(FT) Rotational velocity from Fourier transform
51- 53 I3 km/s vsini(GOF) Rotational velocity from goodness-of-fit
55- 57 I3 km/s vm(GOF) Macroturbulent broadening from goodness-of-fit
--------------------------------------------------------------------------------
History:
From electronic version of the journal
References:
Simon-Diaz & Herrero, Paper I 2014A&A...562A.135S 2014A&A...562A.135S, Cat. J/A+A/562/A135
Simon-Diaz et al., Paper II 2014A&A...570L...6S 2014A&A...570L...6S
Simon-Diaz et al., Paper III 2017A&A...597A..22S 2017A&A...597A..22S, Cat, J/A+A/597/A22
Godart et al., Paper IV 2017A&A...597A..23G 2017A&A...597A..23G
Holgado et al., Paper V 2018A&A...613A..65H 2018A&A...613A..65H, Cat. J/A+A/613/A65
Maiz-Apellaniz & Barba, 2018A&A...613A...9M 2018A&A...613A...9M, Cat. J/A+A/613/A9
Holgado et al., Paper VI 2020A&A...639A.157H 2020A&A...639A.157H, Cat. J/A+A/639/A157
(End) Patricia Vannier [CDS] 14-Apr-2014