Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Southern Sample

Abstract

We are obtaining spectra, spectral types and basic physical parameters for the nearly 3600 dwarf and giant stars earlier than M0 in the Hipparcos catalog within 40pc of the Sun. Here we report on results for 1676 stars in the southern hemisphere observed at Cerro Tololo Interamerican Observatory and Steward Observatory. These results include new, precise, homogeneous spectral types, basic physical parameters (including the effective temperature, surface gravity, and metallicity, [M/H]) and measures of the chromospheric activity of our program stars. We include notes on astrophysically interesting stars in this sample, the metallicity distribution of the solar neighborhood and a table of solar analogues. We also demonstrate that the bimodal nature of the distribution of the chromospheric activity parameter log R'HK depends strongly on the metallicity, and we explore the nature of the ``low-metallicity'' chromospherically active K-type dwarfs.

62 pages including a long table, 6 figures

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• Stellar Chromospheric Activity Database of Solar-like Stars Based on the LAMOST Low-Resolution Spectroscopic Survey: II. the bolometric and photospheric calibration
• The Delta Scuti star 38 Eri from the ground and from space
• Updated Studies on Exomoons in the HD 23079 System
• Multi-wavelength aperture polarimetry of debris disc host stars
• Applying a temporal systematics model to vector Apodizing Phase Plate coronagraphic data: TRAP4vAPP
• Radii, masses, and transit-timing variations of the three-planet system orbiting the naked-eye star TOI-396
• How much large dust could be present in hot exozodiacal dust systems?
• The Young Solar Analogs Project: I. Spectroscopic and Photometric Methods and Multi-year Timescale Spectroscopic Results
• A Digital Low Dispersion Spectral Library Covering the 3500-7500AA Region Using the SAAO Radcliffe 1.9m Telescope's Cassegrain Spectrograph
• High-contrast spectroscopy with the new VLT/ERIS instrument: Molecular maps and radial velocity of the gas giant AF Lep b
• Performance of the Stellar Abundances and atmospheric Parameters Pipeline adapted for M dwarfs I. Atmospheric parameters from the spectroscopic module
• Unravelling the Period Gap using LAMOST Chromospheric Activity Indices
• Correlating Intrinsic Stellar Parameters with Mg II Self-Reversal Depths
• WIde Separation Planets In Time (WISPIT): Two directly imaged exoplanets around the Sun-like stellar binary WISPIT 1
• The JCMT Gould Belt Survey: radiative heating by OB stars
• Distinct Rotational Evolution of Giant Planets and Brown Dwarf Companions
• Identification of young nearby runaway stars based on Gaia data and the lithium test
• The Average Physical Properties of A-G Stars Derived from uvby-H$\beta$ Strömgren-Crawford Photometry as the Basis for a Spectral-Classification Synthetical Approach
• Data-driven stellar parameters for southern TESS FGK targets
• Periodicity in some light curves of the solar analogue V352 CMa
• Companion Mass Limits for 17 Binary Systems Obtained with Binary Differential Imaging and MagAO/Clio
• Linking ice and gas in the Coronet cluster in Corona Australis
• Planetary system architectures with low-mass inner planets: Direct imaging exploration of mature systems beyond 1 au
• How accurately can we age-date solar-type dwarfs using activity/rotation diagnostics?
• The Solar Neighborhood L: Spectroscopic Discovery of K Dwarfs Younger Than 1 Gyr and New Binaries within 30 pc
• Searching for the HR 8799 Debris Disk with HST/STIS
• The mid-infrared spectrum of $\beta$ Pictoris b. First VLTI/MATISSE interferometric observations of an exoplanet
• Precise radial velocities of giant stars XIII. A second Jupiter orbiting in 4:3 resonance in the 7 CMa system
• Polarimetric differential imaging with VLT/NACO. A comprehensive PDI pipeline for NACO data (PIPPIN)
• True Masses using RV data with Hipparcos and Gaia Astrometry
• A Kinematic History of Stellar Encounters with Beta Pictoris
• A test field for Gaia. Radial velocity catalogue of stars in the South Ecliptic Pole
• Radial velocity analysis of stars with debris discs
• SPORES-HWO. II. Companion Mass Limits and Updated Planet Properties for 120 Future Exoplanet Imaging Targets from 35 yr of Precise Doppler Monitoring
• The $\beta$ Pictoris b Hill sphere transit campaign. Paper II: Searching for the signatures of the $\beta$ Pictoris exoplanets through time delay analysis of the $\delta$ Scuti pulsations
• The RoPES project with HARPS and HARPS-N II. A third planet in the multi-planet system HD 176986
• A Cool Earth-sized Planet Candidate Transiting a Tenth Magnitude K-dwarf From K2
• A Mid-Infrared Search for Substellar Companions of Nearby Planet-Host Stars
• How does the shape of the stellar spectrum affect the Raman scattering features in the albedo of exoplanets?
• X-Ray and Ultraviolet Flares on AT Microscopii Observed by AstroSat
• Binary frequency of planet-host stars at wide separations: A new brown dwarf companion to a planet-host star
• Identification of additional young nearby runaway stars based on Gaia data release 2 observations and the lithium test
• The impact of the presence of water ice on the analysis of debris disk observations
• Simulating starspot activity jitter for spectral types F--M: realistic estimates for a representative sample of known exoplanet hosts
• The SOL $\text{(Solar Origin and Life)}$ Project: Detailed characterization of candidates for the ZAMS and Subgiant stages
• Improving exoplanet mass characterisation with Bayesian model selection using the Learned Harmonic Mean Estimator
• CoronaGraph Instrument Reference stars for Exoplanets (CorGI-REx) I. Preliminary Vetting and Implications for the Roman Coronagraph and Habitable Worlds Observatory
• The James Webb Space Telescope Absolute Flux Calibration. I. Program Design and Calibrator Stars
• A Comprehensive Study of the Physical and Geometrical Characteristics of the Close Visual Binary System HIP 45571