Gaia DR2 distances to Collinder 419 and NGC 2264 and new astrometric orbits for HD 193 322 Aa,Ab and 15 Mon Aa,Ab

Abstract

[ABRIDGED] CONTEXT: Gaia DR2 has opened a trove of astrometric and photometric data for Galactic clusters close to the Sun. Lucky imaging has been an operational technique to measure the positions of visual binary systems for a decade and a half, enough to apply its results to the calculation of orbits of some massive multiple systems within ~1 kpc of the Sun. AIMS: We are measuring distances to Galactic stellar groups containing O stars and I start with two of them: Collinder 419 in Cygnus and NGC 2264 in Monoceros. I also aim to derive new astrometric orbits for the Aa,Ab components for the main ionizing sources for both clusters: HD 193 322 and 15 Mon, respectively. METHODS: First, I present a method that uses Gaia DR2 photometry, positions, proper motions, and parallaxes to obtain the membership and distance of a stellar group and apply it to Collinder 419 and NGC 2264. Second, I present a new code that calculates astrometric orbits by searching the whole 7-parameter orbit space and apply it to HD 193 322 Aa,Ab and 15 Mon Aa,Ab using as input literature data from the Washington Double Star Catalog (WDS) and the AstraLux measurements recently presented by Maíz Apellániz et al. (2019). RESULTS: I obtain Gaia DR2 distances of 1006+37-34 pc for Collinder 419 and 719+-16 pc for NGC 2264, with the main contribution to the uncertainties coming from the spatial covariance of the parallaxes. The two NGC 2264 subclusters are at the same distance (within the uncertainties) and they show a significant relative proper motion. The distances are shown to be robust. HD 193 322 Aa,Ab follows an eccentric (e = 0.58+0.03-0.04) orbit with a period of 44+-1 a and the three stars it contains have a total mass of 76.1+9.9-7.4 M_Sol. The orbit of 15 Mon Aa,Ab is even more eccentric (e = 0.770+0.023-0.030), with a period of 108+-12 a and a total mass of 45.1+3.6-3.3 M_Sol for its two stars.

arXiv commentAccepted for publication in A&A

References in corpus (41)

• Gaia Data Release 2. Summary of the contents and survey properties
• The Gaia mission
• Gaia Data Release 2: The astrometric solution
• Gaia Data Release 2: Photometric content and validation
• Gaia Data Release 2: using Gaia parallaxes
• A Gaia DR2 view of the Open Cluster population in the Milky Way
• Gaia Data Release 2: Catalogue validation
• Southern Massive Stars at High Angular Resolution: Observational Campaign and Companion Detection
• The High Angular Resolution Multiplicity of Massive Stars
• The Galactic O-Star Spectroscopic Survey. I. Classification System and Bright Northern Stars in the Blue-Violet at R~2500
• Speckle interferometry at SOAR in 2012 and 2013
• The Distance to NGC 2264
• Kinematic and Spatial Substructure in NGC 2264
• UPMASK: unsupervised photometric membership assignment in stellar clusters
• The Galactic O-Star Spectroscopic Survey (GOSSS). III. 142 additional O-type systems
• A reanalysis of the Gaia Data Release 2 photometric sensitivity curves using HST/STIS spectrophotometry
• CHORIZOS: a CHi-square cOde for parameteRized modelIng and characteriZation of phOtometry and Spectrophotometry
• The VLT-FLAMES Tarantula Survey XVI. The optical+NIR extinction laws in 30 Doradus and the photometric determination of the effective temperatures of OB stars
• The spatial distribution of O-B5 stars in the solar neighborhood as measured by Hipparcos
• Speckle interferometry at SOAR in 2014
• The Multiplicity of Massive Stars: A High Angular Resolution Survey with the HST Fine Guidance Sensor
• Observations of Binary Stars with the Differential Speckle Survey Instrument. VII. Measures from 2010 September to 2012 February at the WIYN Telescope
• MONOS: Multiplicity Of Northern O-type Spectroscopic systems. I. Project description and spectral classifications and visual multiplicity of previously known objects
• Optical-NIR dust extinction towards Galactic O stars
• NGC 604, the Scaled OB Association (SOBA) Prototype. I: Spatial Distribution of the Different Gas Phases and Attenuation by Dust
• New light on the Gaia DR2 parallax zero-point: influence of the asteroseismic approach, in and beyond the Kepler field
• Orbital and physical properties of the $\sigma$ Ori Aa,Ab,B triple system
• Know the Star, Know the Planet. II. Speckle Interferometry of Exoplanet Host Stars
• The Gaia-ESO Survey and CSI 2264: Substructures, disks, and sequential star formation in the young open cluster NGC 2264
• High-resolution imaging of Galactic massive stars with AstraLux. I. 138 fields with delta > -25 degrees
• Speckle interferometry at SOAR in 2015
• AstraLux - the Calar Alto 2.2-m telescope Lucky Imaging camera
• A close encounter of the massive kind
• Lucky Spectroscopy, an equivalent technique to Lucky Imaging. Spatially resolved spectroscopy of massive close visual binaries using the William Herschel Telescope
• A revisit to agglomerates of early-type Hipparcos stars
• Phase-space structures and stellar populations in the star-forming region NGC~ 2264
• The Color-Magnitude Diagram of NGC 2264
• An Interferometric and Spectroscopic Analysis of the Multiple Star System HD 193322
• Spectroscopic study of the extremely young O-type triple system Herschel 36 A in the Hourglass Nebula. I. Orbital properties
• The little-studied cluster Berkeley 90. II. The foreground ISM
• The Membership and Distance of the Open Cluster Collinder 419

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