Spatially resolved spectroscopy of close massive visual binaries with HST/STIS: I. Seven O-type systems

Abstract

CONTEXT. Many O-type stars have nearby companions whose presence hamper their characterization through spectroscopy. AIMS. We want to obtain spatially resolved spectroscopy of close O-type visual binaries to derive their spectral types. METHODS. We use the Space Telescope Imaging Spectrograph (STIS) of the Hubble Space Telescope (HST) to obtain long-slit blue-violet spectroscopy of eight Galactic O-type stars with nearby visual companions and use spatial-profile fitting to extract the separate spectra. We also use the ground-based Galactic O-Star Spectroscopic Survey (GOSSS) to study more distant visual components. RESULTS. We spatially resolve seven of the eight systems, present spectra for their components, and obtain their spectral types. Those seven multiple systems are iota Ori Aa,Ab,B, 15 Mon Aa,Ab,C, tau CMa Aa,Ab,B,C,D,E, HD 206 267 Aa,Ab,C,D, HD 193 443 A,B, HD 16 429 Aa,Ab, and IU Aur A,B. This is the first time that spatially resolved spectroscopy of the close visual binaries of those systems is obtained. We establish the applicability of the technique as a function of the separation and magnitude difference of the binary.

Accepted for publication in A&A

References in corpus (6)

• Lucky Imaging: High Angular Resolution Imaging in the Visible from the Ground
• MONOS: Multiplicity Of Northern O-type Spectroscopic systems. I. Project description and spectral classifications and visual multiplicity of previously known objects
• Weighing the Darkness: Astrometric Mass Measurement of Hidden Stellar Companions using Gaia
• A close encounter of the massive kind
• Gaia DR2 distances to Collinder 419 and NGC 2264 and new astrometric orbits for HD 193 322 Aa,Ab and 15 Mon Aa,Ab
• A detailed non-LTE analysis of LB-1: Revised parameters and surface abundances

Cited by in corpus (17)

• The Villafranca catalog of Galactic OB groups. II. From Gaia DR2 to EDR3 and ten new systems with O stars
• The Villafranca catalog of Galactic OB groups: I. Systems with O2-O3.5 stars
• MONOS.II. Orbit review and analysis for 35 single-lined spectroscopic binary systems and candidates
• Surveying the Bright Stars by Optical Interferometry III: A Magnitude-Limited Multiplicity Survey of Classical Be-Stars
• Lucky spectroscopy, an equivalent technique to Lucky Imaging: II. Spatially-resolved intermediate-resolution blue-violet spectroscopy of 19 close massive binaries using the William Herschel Telescope
• A 3D View of Orion: I. Barnard's Loop
• Multiplicity of northern bright O-type stars with optical long baseline interferometry
• Membership analysis and 3D kinematics of the star-forming complex around Trumpler 37 using Gaia-DR3
• Gaia-ESO Survey: massive stars in the Carina Nebula. A new census of OB stars
• Star formation in IC1396: Kinematics and subcluster structure revealed by Gaia
• Are magnetic fields universal in O-type multiple systems?
• Extended hard X-ray emission in highly obscured AGN
• The first spectroscopically confirmed brown dwarfs in NGC 2264
• Analysis of Selected Runaway Stars in the Orion Nebula Based on Data from the Gaia EDR3 Catalogue
• The brown dwarf population in the star forming region NGC2264
• MONOS: Multiplicity Of Northern O-type Spectroscopic systems. III. New orbits and Gaia TESS analysis for 10 SB2E systems
• NIR spectroscopic survey of protostellar jets in the star forming region IC 1396N