The blue straggler S1082: a triple system in the old open cluster M67

Abstract

We present a photometric and spectroscopic study of the blue straggler S1082 in the open cluster M67. Our observations confirm the previously reported 1.07 day eclipse light curve and the absence of large radial-velocity variations of the narrow-lined star. However, we find two more spectral components which do vary on the 1.07 day period. We conclude that the system is triple. We fit the light and radial-velocity curves and find that the total mass of the inner binary is more than twice the turnoff mass and that the outer companion to the binary is a blue straggler on its own account. We briefly discuss formation scenarios for this multiple system.

accepted by A&A, 12 pages, 11 figures

References in corpus (1)

• Direct N-body Modelling of Stellar Populations: Blue Stragglers in M67

Cited by in corpus (37)

• On the triple origin of blue stragglers
• A Complete N-body Model of the Old Open Cluster M67
• Stellar Radial Velocities in the Old Open Cluster M67 (NGC 2682) I. Memberships, Binaries, and Kinematics
• A High Relative-Precision Color-Magnitude Diagram of M67
• WIYN Open Cluster Study. XXIV. Stellar Radial-Velocity Measurements in NGC 6819
• An Analytic Technique for Constraining the Dynamical Origins of Multiple Star Systems Containing Merger Products
• Mergers of close primordial binaries
• The blue stragglers formed via mass transfer in old open clusters
• The Dynamical Significance of Triple Star Systems in Star Clusters
• Time-Series Photometry of M67: W UMa Systems, Blue Stragglers, and Related Systems
• The Blue Straggler RS CVn Star S1082 in M67: A Detailed Light Curve and the Possibility of a Triple
• UVIT Open Cluster Study. II. Detection of extremely low mass white dwarfs and post-mass transfer binaries in M67
• An Analytic Model for Blue Straggler Formation in Globular Clusters
• A Chandra observation of the old open cluster M67
• Close binary stars in the solar-age Galactic open cluster M67
• The Blue Straggler and Main-sequence Binary Population of the Low-Mass Globular Cluster Palomar 13
• Effects of chemical composition and thermohaline mixing on the accreting components for low--mass close binaries: application to blue stragglers
• Photometric variability in the old open cluster M 67. II. General Survey
• Fast rotating Blue Stragglers in the globular cluster M4
• Hubble Space Telescope proper motion (HSTPROMO) catalogs of Galactic globular clusters. IV. Kinematic profiles and average masses of blue straggler stars
• $uvby-H_{\beta }$ CCD photometry and membership segregation of the open cluster NGC2682 (M67)
• MOST satellite photometry of stars in the M67 field: Eclipsing binaries, blue stragglers and delta-Scuti variables
• Photometric variability in the open cluster M67 I. Cluster members detected in X-rays
• A Chandra X-ray study of the interacting binaries in the old open cluster NGC6791
• The Promiscuous Nature of Stars in Clusters
• The Blue Stragglers of the Old Open Cluster NGC 188
• Mergers of Equal-Mass Binaries with Compact Object Companions from Mass Transfer in Triple Star Systems
• A chemical study of M67 candidate blue stragglers and evolved blue stragglers observed with APOGEE DR14
• A Triple Origin for Twin Blue Stragglers in Close Binaries
• Formation and Evolution of Blue Stragglers in 47 Tucanae
• Bright Variable Stars in NGC 6819 - An Open Cluster in the Kepler Field
• Model computations of blue stragglers and W UMa-type stars in globular clusters
• S986 in M67: A Totally-Eclipsing Binary at the Cluster Turnoff
• Blue Stragglers and Friends: Initial Evolutionary Pathways in Close Low-Mass Binaries: Literature Review
• A Chandra X-ray census of the interacting binaries in old open clusters - Collinder 261
• A spectroscopic study of the blue stragglers in M67
• A Chandra X-ray census of the interacting binaries in old open clusters - NGC188