J/A+A/655/A4 MONOS II. SB1 Orbital review and analysis (Trigueros Paez+, 2021)
MONOS: Multiplicity Of Northern O-type Spectroscopic systems.
II. Orbit review and analysis for 35 single-lined spectroscopic binary systems
and candidates.
Trigueros Paez E., Barba R.H., Negueruela I., Maiz Apellaniz J.,
Simon-Diaz S., Holgado G.
<Astron. Astrophys. 655, A4 (2021)>
=2021A&A...655A...4T 2021A&A...655A...4T (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, eclipsing ; Binaries, spectroscopic ;
Spectroscopy ; Stars, O ; Radial velocities
Keywords: binaries: spectroscopic - binaries: eclipsing - stars: early-type -
stars: kinematics and dynamics - binaries: general
Abstract:
Massive stars are a key element to understand the chemical and
dynamical evolution of galaxies. Stellar evolution is conditioned by
many factors: rotation, mass loss, and interaction with other objects
are the most important ones for massive stars. During the first
evolutionary stages of stars with initial masses (i.e. MZAMS) in
the MZAMS∼18-70M∑ range they are of spectral type O.
Given that stars in this mass range spend roughly 90% of their
lifetime as O-type stars, establishing the multiplicity frequency and
binary properties of O-type stars is crucial for many fields of modern
astrophysics.
The aim of the MONOS project is to collect information to study
Northern Galactic O-type spectroscopic binaries. In this second paper,
we tackle the study of the 35 single line spectroscopic binary (SB1)
systems identified in the previous paper of the series Maiz Apellaniz
et al., (2019, Cat. J/A+A/626/A20) analyze our data, and review the
literature on the orbits of the systems.
We have measured ∼4500 radial velocities for a selection of diagnostic
lines for the ∼700 spectra of the studied systems in our database, for
which we have used two different methods: Gaussian fit for several
lines per object and cross-correlation with synthetic spectra computed
with the FASTWIND stellar atmospheric code. We have also explored the
photometric data delivered by the TESS mission to analyze the
light-curve (LC) of the systems extracting 31 of them. We have
explored the possible periods with the Lomb-Scargle method and,
whenever possible, calculated the orbital solutions using the
SBOP&GBART codes. For those systems in which an improved solution was
possible we have merged our RVs with those in the literature and
calculated a combined solution.
As a result of this work, of the 35 SB1 systems identified in MONOS I,
we have confirmed 21 systems as SB1 with good orbits, discarded the
binary nature of 6 stars (9 Sge, HD 192281, HDE 229232 AB, 68 Cyg,
HD 108 and α Cam), and left 6 stars as inconclusive due to lack
of data. The remaining two stars are 15 Mon Aa which has been
classified as SB2 and Cyg OB2-22 C for which we find evidence that it
is most likely a triple system where the O star is orbiting an
eclipsing SB1. We have also recalculated 20 new orbital solutions,
including the first spectroscopic orbital solution for V747 Cep. For
Cyg OB2-22 C we have obtained new ephemerides but no new orbit.
Description:
File sbs.dat gives the SBS and orbital parameters of the objects
classified as SB1 in this paper.
File rvs.dat gives the radial velocities and formal errors for
each measurement.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
sbs.dat 175 28 Orbital parameters
rvs.dat 246 653 Radial Velocites
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See also:
III/274 : Galactic O-Star Spectroscopic Survey (GOSSS) (Sota+, 2014)
J/A+A/626/A20 : MONOS. I. Spectral classifications (Maiz Apellaniz+, 2019)
Byte-by-byte Description of file: sbs.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- Name Object name
19- 26 A8 --- SBS-MONOSI Spectroscopic binarity status in MONOS-I
30- 37 A8 --- SBS-MONOSII Spectroscopic binarity status in MONOS-II
41- 52 F12.6 d Per Orbital period
54- 64 F11.6 d e_Per ? Orbital period error (1)
67- 76 F10.4 d T0 Periastron passage (JD-2400000)
78- 86 F9.4 d e_T0 Periastron passage error (1)
88- 93 F6.4 --- ecc Orbital eccentricity
95-100 F6.4 --- e_ecc ? Orbital eccentricity error (1)
102-107 F6.2 deg omega ? Longitude of the periastron
109-113 F5.2 deg e_omega ? Longitude of the periastron error (1)
115-120 F6.2 km/s K1 Velocity semiamplitude
122-125 F4.2 km/s e_K1 Velocity semiamplitude error (1)
127-132 F6.2 km/s gamma1 Systemic Velocity
134-137 F4.2 km/s e_gamma1 Systemic Velocity error (1)
139-141 I3 km/s vsini ? Projected rotational velocity
143-144 I2 km/s e_vsini ? Projected rotational velocity error (1)
146-152 F7.5 Msun f(m) Mass function
154-160 F7.5 Msun e_f(m) ? Mass function error (2)
162-175 A14 --- Ref Reference (3)
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Note (1): An NULL value means that the parameter was fixed for that solution.
Note (2): An NULL value means that was calculated by us using the orbital
parameters.
Note (3): The ion used for the determination of the orbital parameters are also
noted for orbits derived in this paper. If the orbit uses historical RVs is
also marked with "comb."
Reference code as follows:
TP. = Trigueros Paez et al. This paper
Ko12 = Kobulnicky et al., 2012ApJ...756...50K 2012ApJ...756...50K
Ko14 = Kobulnicky et al., 2014ApJS..213...34K 2014ApJS..213...34K
Mc03 = McSwain, 2003ApJ...595.1124M 2003ApJ...595.1124M
Cv10 = Cvetkovic et al., 2010NewA...15..302C 2010NewA...15..302C
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Byte-by-byte Description of file: rvs.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 16 A16 --- Name Object name
19- 30 A12 --- Spectra LiLiMarlin ID of the spectrum
32- 40 F9.3 d RJD RJD of the observation
42- 47 F6.1 km/s XCorr ? Cross-Correlation method Radial Velocity
49- 51 F3.1 km/s e_XCorr ? Formal error for the Cross-Correlation RV
53- 58 F6.1 km/s HeI4471 ? Gaussian RV for the HeI4471 line
60- 62 F3.1 km/s e_HeI4471 ? Formal error for the HeI4471 measurements
64- 68 F5.1 km/s HeI4713 ? Gaussian RV for the HeI4713 line
70- 72 F3.1 km/s e_HeI4713 ? Formal error for the HeI4713 measurements
74- 78 F5.1 km/s HeI4922 ? Gaussian RV for the HeI4922 line
80- 82 F3.1 km/s e_HeI4922 ? Formal error for the HeI4922 measurements
84- 89 F6.1 km/s HeI5015 ? Gaussian RV for the HeI5015 line
91- 93 F3.1 km/s e_HeI5015 ? Formal error for the HeI5015 measurements
95-100 F6.1 km/s HeI5876 ? Gaussian RV for the HeI5876 line
103-105 F3.1 km/s e_HeI5876 ? Formal error for the HeI5876 measurements
107-111 F5.1 km/s HeI6678 ? Gaussian RV for the HeI6678 line
113-115 F3.1 km/s e_HeI6678 ? Formal error for the HeI6678 measurements
117-122 F6.1 km/s HeI7065 ? Gaussian RV for the HeI7065 line
124-126 F3.1 km/s e_HeI7065 ? Formal error for the HeI7065 measurements
128-133 F6.1 km/s HeII4542 ? Gaussian RV for the HeII4542 line
135-138 F4.1 km/s e_HeII4542 ? Formal error for the HeII4542 measurements
140-145 F6.1 km/s HeII4686 ? Gaussian RV for the HeII4686 line
147-149 F3.1 km/s e_HeII4686 ? Formal error for the HeII4686 measurements
151-156 F6.1 km/s HeII5412 ? Gaussian RV for the HeII5412 line
158-161 F4.1 km/s e_HeII5412 ? Formal error for the HeII5412 measurements
163-167 F5.1 km/s HeII8237 ? Gaussian RV for the HeII8237 line
169-171 F3.1 km/s e_HeII8237 ? Formal error for the HeII8237 measurements
173-178 F6.1 km/s OIII5592 ? Gaussian RV for the OIII5592 line
180-183 F4.1 km/s e_OIII5592 ? Formal error for the OIII5592 measurements
185-190 F6.1 km/s SiIII4553 ? Gaussian RV for the SiIII4553 line
192-194 F3.1 km/s e_SiIII4553 ? Formal error for the SiIII4553 measurements
196-199 F4.1 km/s CIV5801 ? Gaussian RV for the CIV5801 line
201-203 F3.1 km/s e_CIV5801 ? Formal error for the CIV5801 measurements
205-210 F6.1 km/s CIV5812 ? Gaussian RV for the CIV5812 line
212-215 F4.1 km/s e_CIV5812 ? Formal error for the CIV5812 measurements
217-220 F4.1 km/s NIII4379 ? Gaussian RV for the NIII4379 line
222-224 F3.1 km/s e_NIII4379 ? Formal error for the NIII4379 measurements
226-231 F6.1 km/s Halpha ? Gaussian RV for the Halpha line
233-235 F3.1 km/s e_Halpha ? Formal error for the Halpha measurements
237-242 F6.1 km/s Hbeta ? Gaussian RV for the Hbeta line
244-246 F3.1 km/s e_Hbeta ? Formal error for the Hbeta measurements
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Acknowledgements:
Emilio Trigueros Paez, etrigueros(at)cab.inta-csic.es
References:
Maiz Apellaniz et al., Paper I 2019A&A...626A..20M 2019A&A...626A..20M, Cat. J/A+A/626/A20
(End) Patricia Vannier [CDS] 07-Jul-2021