A fast-rotating blue straggler star in the tidal tail of the open cluster NGC 752

Abstract

NGC 752 is a famous Galactic open cluster of intermediate age. In recent works, a very long and asymmetric tail was newly revealed. A blue straggler star (BSS) at the periphery of the tidal tail of the cluster has been identified subsequently. We aim to perform a detailed analysis of the newly detected BSS based on the available comprehensive spectroscopic and photometric data. We also explored this BSS's possible formation pathway and age limitation based on the collected spectroscopic and photometric data. We estimated the projected rotational velocity $v\sin i$ and the mass of the BSS from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope low-resolution spectra and multiband photometric data from various catalogs, respectively. The newly discovered BSS is confirmed as a genuine member of NGC 752. The lack of ultraviolet excess in the SED and no significant variations in the light curve imply that this BSS is likely a single star ($mass=1.86_{-0.94}^{+3.62}{M}_{\odot }$) formed through stellar mergers. The fast rotation velocity ($v\sin i=206.9\pm 4.9$~km ${\mathrm{s}}^{-1}$) of the BSS may provide constraints on its age (less than a hundred million years), but more formation details require further investigation.

7 pages, 6 figures. Accepted by A&A

References in corpus (32)

• Gaia Data Release 3: Summary of the content and survey properties
• The Transiting Exoplanet Survey Satellite
• Painting a portrait of the Galactic disc with its stellar clusters
• Determining stellar atmospheric parameters and chemical abundances of FGK stars with iSpec
• Gaia Data Release 3 Properties and validation of the radial velocities
• Modern stellar spectroscopy caveats
• Updated parameters of 1743 open clusters based on Gaia DR2
• Clusters and mirages: cataloguing stellar aggregates in the Milky Way
• Mergers and Obliquities in Stellar Triples
• Dynamical age differences among coeval star clusters as revealed by blue stragglers
• Gaia Data Release 3: Apsis II -- Stellar Parameters
• Activity indicators and stellar parameters of the Kepler targets. An application of the ROTFIT pipeline to LAMOST-Kepler stellar spectra
• ARIADNE: Measuring accurate and precise stellar parameters through SED fitting
• Extended stellar systems in the solar neighborhood - I. The tidal tails of the Hyades
• Hunting for Neighboring Open Clusters with Gaia DR3: 101 New Open Clusters within 500 pc
• 3D Morphology of Open Clusters in the Solar Neighborhood with Gaia EDR3 II: Hierarchical Star Formation Revealed by Spatial and Kinematic Substructures
• Blue Straggler Stars in Open Clusters using Gaia: Dependence on Cluster Parameters and Possible Formation Pathways
• Diagnosing the Stellar Population and Tidal Structure of the Blanco1 Star Cluster
• The substructure and halo population of the Double Cluster $h$ and $\chi$ Persei
• New insights into the structure of open clusters in the Gaia era
• A Census of Blue Stragglers in Gaia DR2 Open Clusters as a Test of Population Synthesis and Mass Transfer Physics
• Radial velocity measurements from LAMOST medium-resolution spectroscopic observations: A pointing towards the Kepler field
• Fast rotating Blue Stragglers prefer loose clusters
• Discovery of a double sequence of blue straggler stars in the core-collapsed globular cluster NGC 6256
• A tale of caution: the tails of NGC 752 are much longer than claimed
• Discovery of a double Blue Straggler sequence in M15: new insight into the core-collapse process
• How much mass and angular momentum can the progenitors of carbon-enriched stars accrete?
• The new detection of blue straggler stars in 50 open clusters using Gaia DR3
• Discovery of extended structure around open cluster COIN-Gaia 13 based on Gaia EDR3
• Empirical measurement of the dynamical ages of three globular clusters and some considerations on the use of the dynamical clock
• M67 Blue Stragglers with High-resolution Infrared Spectroscopy
• Blue Straggler Stars in Globular Clusters: a powerful tool to probe the internal dynamical evolution of stellar systems

Cited by in corpus (2)

• LAMOST medium-resolution spectroscopic survey of Galactic Open Clusters (LAMOST-MRS-O): An overview of survey plan and preliminary results
• The Hierarchical Structure of the Open Cluster NGC 752