LAMOST medium-resolution observations of the Pleiades

Abstract

In this work we present the results of our analysis of medium-resolution LAMOST spectra of late-type candidate members of the Pleiades. We have used the code ROTFIT to determine the atmospheric parameters (Teff, logg, and [Fe/H]), radial velocity (RV), and projected rotation velocity (vsini) for 1581 spectra of 283 stars. Moreover, for late-type stars (Teff<6500 K), we also calculated the H$\alpha$ and LiI-6708 net equivalent width by means of the subtraction of inactive photospheric templates. We have also used rotation periods available in the literature and we have determined them for 89 stars by analyzing TESS photometry. The RV distribution of the members peaks at 5.0 km/s with a dispersion of 1.4 km/s, while the average metallicity is [Fe/H]=-0.03$\pm$0.06, in line with previous determinations. Fitting empirical Lithium isochrones, we obtain a reliable age for the Pleiades of 118$\pm$6 Myr, in agreement with the recent literature. The activity indicators H$\alpha$ line flux (Fha) and luminosity ratio (R'ha) show the hottest stars to be the less active ones. The R'ha values display the typical activity-rotation trend with the Rossby number with a steep decay for $R_{\mathrm{O}}\ge$0.2 and a nearly flat (saturated) activity level for smaller values. However, we still see a slight dependence on $R_{\mathrm{O}}$ in the saturated regime which is well fitted by a power law with a slope of $-0.18\pm 0.02$, in agreement with some previous work. For three sources we have found LAMOST spectra acquired during flares showing strong and broad H$\alpha$ profiles and the presence of the HeI-6678 emission line. We identify 39 possible SB1 and ten SB2 systems. We have also shown the potential of the LAMOST-MRS spectra, which allowed us to refine the orbital solution of some binary and to discover a new double-lined binary.

27 pages, accepted for publication in A&A

References in corpus (69)

• Gaia Data Release 3: Summary of the content and survey properties
• The Transiting Exoplanet Survey Satellite
• The stellar activity-rotation relationship and the evolution of stellar dynamos
• Global survey of star clusters in the Milky Way II. The catalogue of basic parameters
• On the rotational evolution of solar- and late-type stars, its magnetic origins, and the possibility of stellar gyrochronology
• A Gaia DR2 view of the Open Cluster population in the Milky Way
• Star Clusters Across Cosmic Time
• Painting a portrait of the Galactic disc with its stellar clusters
• APOGEE Data and Spectral Analysis from SDSS Data Release 16: Seven Years of Observations Including First Results from APOGEE-South
• Keck Spectra of Pleiades Brown Dwarf Candidates and a Precise Determination of the Lithium Depletion Edge in the Pleiades
• The H$\alpha$ emission of nearby M dwarfs and its relation to stellar rotation
• Departures from LTE for neutral Li in late-type stars
• On the Correlation between the Magnetic Activity Levels, the Metallicities and the Radii of Low-Mass Stars
• The ELODIE archive
• Updated parameters of 1743 open clusters based on Gaia DR2
• Time scales of Li evolution: a homogeneous analysis of open clusters from ZAMS to late-MS
• Age determination for 269 $Gaia$ DR2 Open Clusters
• An empirical criterion to classify T Tauri stars and substellar analogs using low-resolution optical spectroscopy
• Spectroscopy of Very Low Mass Stars and Brown Dwarfs in IC2391: Lithium depletion and Halpha emission
• Rotation in the Pleiades with K2: I. Data and First Results
• Generalized investigation of the rotation-activity relation: Favouring rotation period instead of Rossby number
• Improving the open cluster census. III. Using cluster masses, radii, and dynamics to create a cleaned open cluster catalogue
• Gaia Data Release 2: The catalogue of radial velocity standard stars
• Magnetic Inhibition of Convection and the Fundamental Properties of Low-Mass Stars. I. Stars with a Radiative Core
• Age Determinations of the Hyades, Praesepe, and Pleiades via MESA Models with Rotation
• The effect of activity on stellar temperatures and radii
• Older and Colder: The impact of starspots on pre-main sequence stellar evolution
• Magnetic Inhibition of Convection and the Fundamental Properties of Low-Mass Stars. II. Fully Convective Main Sequence Stars
• An Empirical Correction for Activity Effects on the Temperatures, Radii, and Estimated Masses of Low-Mass Stars and Brown Dwarfs
• Self-consistent Stellar Radial Velocities from LAMOST Medium-Resolution Survey (MRS) DR7
• The Gaia-ESO Survey: Chromospheric Emission, Accretion Properties, and Rotation in $\gamma$ Velorum and Chamaeleon I
• Rotational velocities of low-mass stars in the Pleiades and Hyades
• The lithium-rotation connection in the 125 Myr-old Pleiades cluster
• Magnetic activity and differential rotation in the very young star KIC 8429280
• Multiwavelength optical observations of chromospherically active binary systems. I. Simultaneous H{alpha}, NaI D{1}, D{2}, and HeI D{3} observations
• Rotation, inflation, and lithium in the Pleiades
• IN-SYNC I: Homogeneous Stellar Parameters from High Resolution APOGEE Spectra for Thousands of Pre-main Sequence Star
• Gaia DR3 detectability of unresolved binary systems
• A Tale of Two Anomalies: Depletion, Dispersion, and the Connection Between the Stellar Lithium Spread and Inflated Radii on the Pre-Main Sequence
• The Gaia-ESO Survey: Empirical estimates of stellar ages from lithium equivalent widths (EAGLES)
• Stellar activity with LAMOST - II. Chromospheric activity in open clusters
• A Measurement of Radius Inflation in the Pleiades and its Relation to Rotation and Lithium Depletion
• Temperatures and Metallicities of M dwarfs in the APOGEE Survey
• LAMOST observations in the Kepler field. II. Database of the low-resolution spectra from the five-year regular survey
• Stellar activity with LAMOST. I. Spot configuration in Pleiades
• The inflated radii of M-dwarfs in the Pleiades
• Phase II of the LAMOST-Kepler/K2 survey. I. Time series of medium-resolution spectroscopic observations
• The effect of starspots on the radii of low-mass pre-main sequence stars
• GIARPS High-resolution Observations of T Tauri stars (GHOsT). IV. Accretion properties of the Taurus-Auriga young association
• The radii of M-dwarfs in the young open cluster NGC 2516
• Spots, plages, and flares on lambda Andromedae and II Pegasi
• Simultaneous Optical and X-ray Observations of Flares and Rotational Modulation on the RS CVn Binary HR 1099 (V711 Tau) from the MUSICOS 1998 Campaign
• A new catalogue of radial velocity standard stars from the APOGEE data
• Starspots and Magnetism: Testing the Activity Paradigm in the Pleiades and M67
• Using rotation, magnetic activity and lithium to estimate the ages of low mass stars
• Properties of Radial Velocities measurement based on LAMOST-II Medium-Resolution Spectroscopic Observations
• The effect of starspots on the ages of low-mass stars determined from the lithium depletion boundary
• A Spectroscopic Survey of the Youngest Field Stars in the Solar Neighborhood. II. The optically faint sample
• The Gaia-ESO Survey: Stellar radii in the young open clusters NGC 2264, NGC 2547 and NGC 2516
• Long-term Spectroscopic Survey of the Pleiades Cluster: The Binary Population
• The Effects of Starspots on Spectroscopic Mass Estimates of Low-mass Young Stars
• Tidal tails of open star clusters as probes to early gas expulsion II: Predictions for Gaia
• The seven sisters DANCe.II. Proper motions and the lithium-rotation-activity connection for G and K Pleiads
• Prominence activation, optical flare, and post-flare loops on the RS Canum Venaticorum star SZ Piscium
• The effect of spots on the luminosity spread of the Pleiades
• A Gaia astrometric view of the open clusters Pleiades, Praesepe and Blanco 1
• Characterization of Kepler targets based on medium-resolution LAMOST spectra analyzed with ROTFIT
• Magnetic Fields of M Dwarfs from the Pleiades Open Cluster
• The Radcliffe Wave as traced by young open clusters: Stellar parameters, activity indicators, and abundances of solar-type members of eight young clusters

Cited by in corpus (1)

• Tidal Synchronization of Binaries in Pleiades