J/A+A/708/A98 Single-lined spectroscopic orbits RVs (Barba+, 2026)
The OWN Survey. A high-resolution spectroscopic survey of southern Galactic O
and WN-type stars. I. Project description and single-lined spectroscopic orbits.
Barba R.H., Gamen R., Morrell N.I., Arias J.I., Maiz Apellaniz J., Higa R.,
Rodriguez C., Putkuri C., Ferrero G.A., Ansin T., Moreno J.,
Molina-Calzada J.A., Holgado G., Rosu S.
<Astron. Astrophys. 708, A98 (2026)>
=2026A&A...708A..98B 2026A&A...708A..98B (SIMBAD/NED BibCode)
ADC_Keywords: Stars, O ; Stars, early-type ; Radial velocities ; Optical
Keywords: binaries: close - binaries: spectroscopic - stars: massive
Abstract:
Massive stars play crucial roles in galactic dynamics and chemical
evolution. They are the most significant sources of ionizing UV
radiation, their substantial mass-loss rates and explosions inject
energy and enrich their surroundings, and their dynamical interactions
eject stars and alter the evolution of stellar clusters. Consequently,
the study of massive stars is essential for understanding various
astrophysical phenomena, including galaxy chemical evolution,
interstellar medium dynamics, gamma-ray bursts, and the reionization
of the Universe. Key parameters influencing the evolution of massive
stars include mass, mass-loss rate, chemical composition, and
rotation. The orbits of spectroscopic binaries are particularly
valuable because they provide constraints on stellar masses, and when
combined with complementary data (e.g., photometry or interferometry),
these masses can be fully determined.
The OWN Survey was started two decades ago to study Galactic O- and
WN- (hence the name) type southern spectroscopic binaries. In this
paper we present the final results for single-lined (SB1)
spectroscopic orbits.
The OWN Survey carried out a long-term spectroscopic campaign to
search for radial velocity variations indicative of orbital motion in
a sample of southern Galactic O- and WN-type stars with
high-resolution spectrographs in Argentina and Chile. The OWN spectra
were later combined with high-resolution spectra from other sources
and, in some cases, photometric time series to derive orbits and
disentangled spectra, from which masses were constrained or determined
and spectral classifications obtained. High-resolution optical spectra
of 212 massive stars were obtained during the ∼20 years of the OWN
project, and each target was observed at least three times.
Among the 212 stars, 144 exhibited radial-velocity variations greater
than 15km/s. We present a complete and coherent compilation for
the 23 systems with single-lined spectroscopic orbits identified in
our sample. In Paper II we will perform a similar analysis for the
systems with double-lined spectroscopic orbits.
Description:
The table presents the stellar name, the measured radial velocities,
and the heliocentric Julian date (HJD) of each observation.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 66 24 List of studied stars
rvs-own1.dat 33 1233 Radial velocities
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Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Target Name of the target
17- 18 I2 h RAh Right ascension (J2000)
20- 21 I2 min RAm Right ascension (J2000)
23- 35 F13.10 s RAs Right ascension (J2000)
37 A1 --- DE- Declination sign (J2000)
38- 39 I2 deg DEd Declination (J2000)
41- 42 I2 arcmin DEm Declination (J2000)
44- 55 F12.9 arcsec DEs Declination (J2000)
57- 66 A10 --- SName Simbad name
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Byte-by-byte Description of file: rvs-own1.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Target Name of the target
17- 27 F11.3 d HJD Heliocentric Julian Day
29- 33 F5.1 km/s RV Radial Velocity
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Acknowledgements:
Roberto Gamen, rgamen(at)fcaglp.unlp.edu.ar
(End) Patricia Vannier [CDS] 05-Mar-2026