A Grid of NLTE Line-Blanketed Model Atmospheres of Early B-type Stars

Abstract

We have constructed a comprehensive grid of 1540 metal line-blanketed, NLTE, plane-parallel, hydrostatic model atmospheres for the basic parameters appropriate to early B-type stars. The BSTAR2006 grid considers 16 values of effective temperatures, 15,000 K <= Teff <= 30,000 K with 1,000 K steps, 13 surface gravities, 1.75 <= log g <= 4.75 with 0.25 dex steps, 6 chemical compositions, and a microturbulent velocity of 2 km/s. The lower limit of log g for a given effective temperature is set by an approximate location of the Eddington limit. The selected chemical compositions range from twice to one tenth of the solar metallicity and metal-free. Additional model atmospheres for B supergiants (log g <= 3.0) have been calculated with a higher microturbulent velocity (10 km/s) and a surface composition that is enriched in helium and nitrogen, and depleted in carbon. This new grid complements our earlier OSTAR2002 grid of O-type stars (Lanz & Hubeny, 2003, ApJS, 146, 417). The paper contains a description of the BSTAR2006 grid and some illustrative examples and comparisons. NLTE ionization fractions, bolometric corrections, radiative accelerations, and effective gravities are obtained over the parameter range covered by the grid. By extrapolating radiative accelerations, we have determined an improved estimate of the Eddington limit in absence of rotation between 55,000 and 15,000 K. The complete BSTAR2006 grid is available at the TLUSTY website (http://nova.astro.umd.edu).

arXiv comment50 pages; to appear in ApJS; models available at http://nova.astro.umd.edu

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• Ultraviolet Spectropolarimetry With Polstar: Using Polstar to test Magnetospheric Mass-loss Quenching
• HIP 15429: A newborn Be star on an eccentric binary orbit
• On the nature of the Be star HR 7409 (7 Vul)
• X-ray irradiation of the stellar wind in HMXBs with B supergiants: Implications for ULXs
• A Grid of Synthetic Spectra for Subdwarfs: Non-LTE line-blanketed atmosphere models
• NLTE wind models of hot subdwarf stars
• Variations of the high-level Balmer line spectrum of the helium-strong star Sigma Orionis E
• Understanding the rotational variability of K2 targets. HgMn star KIC 250152017 and blue horizontal branch star KIC 249660366
• Binarity at LOw Metallicity (BLOeM): Projected rotational velocities
• Gaia-ESO Survey: massive stars in the Carina Nebula. II. The spectroscopic analysis of the O-star population
• Unveiling the evolutionary state of three B supergiant stars: PU Gem, $\epsilon$ CMa and $\eta$ CMa
• Optically-thick Structure in Early B Type Supergiant Stellar Winds at Low Metallicities
• Dust around massive stars is agnostic to galactic environment: New insights from PHAT/BEAST
• The Origins of Young Stars in the Direction of the Leading Arm of the Magellanic Stream: Abundances, Kinematics, and Orbits
• Detection of cesium in the atmosphere of the hot He-rich white dwarf HD 149499B
• Are the O stars in WR+O binaries exceptionally rapid rotators?
• Hot-star wind models with magnetically split line blanketing
• The O-type eclipsing binary SZ Cam revisited
• Effects of chemically homogeneous evolution of the first stars on the 21-cm signal and reionization
• ISM enrichment and local pollution in dwarf galaxies
• Multiwavelength Observations of the Runaway Binary HD 15137
• Infrared Excess of a Large OB Star Sample
• Weak wind effects in CNO driven winds of hot first stars
• A NLTE model atmosphere analysis of the pulsating sdO star SDSS J1600+0748
• Multiple variability time-scales of the early nitrogen-rich Wolf-Rayet star WR7
• Searching for compact objects in the single-lined spectroscopic binaries of the young Galactic cluster NGC 6231
• Just how hot are the $\omega$ Centauri extreme horizontal branch pulsators?
• Photometric properties and stellar parameters of the rapidly rotating magnetic early-B star HD 345439
• Improved model of the triple system V746 Cas that has a bipolar magnetic field associated with the tertiary
• A Detailed Far-Ultraviolet Spectral Atlas of Main Sequence B Stars
• Radiative transfer in stellar atmospheres
• Spherically symmetric NLTE model atmospheres of hot hydrogen-helium first stars
• Investigating silicate, carbon, and water in the diffuse interstellar medium: the first shots from WISCI
• X-Shooting ULLYSES: Massive stars at low metallicity. XIII. Putting the bi-stability jump to the test in the LMC
• The Local Ultraviolet to Infrared Treasury I. Survey Overview of the Broadband Imaging
• Rotational synchronisation of B-type binaries in 30 Doradus
• 3D structure of HII regions in the star-forming complex S254-S258
• Direct observation of the radial magnetic field gradient in HD58260 from spectropolarimetry of NLTE lines in emission
• Resonances in the Photoionization Cross Sections of Atomic Nitrogen Shape the Far-Ultraviolet Spectrum of the Bright Star in 47 Tucanae
• The NGC 346 massive star census: Nitrogen abundances for apparently single, narrow lined, hydrogen core burning B-type stars
• Complex asteroseismology of the Slowly Pulsating B-type star HD74560
• Multi-wavelength Observations of MWC 297: Constraints on Disk Inclination and Mass Outflow
• Uncovering the structure and kinematics of the ionized core of M\,2-9 with ALMA
• A Refined Sample of Lyman Excess H II Regions
• A test field for Gaia. Radial velocity catalogue of stars in the South Ecliptic Pole
• Spectroscopy of the massive interacting binary UU Cassiopeiae
• Fluorescent Fe K line emission of gamma Cas stars II. Predictions for magnetic interactions and white-dwarf accretion scenarios
• Spectroscopic and Photometric Behaviour of LP Ori
• Radial velocities from far red spectra of Carina Arm O and early B stars
• A Catalog of Stellar and Dust Properties for 500,000 Stars in the Southwest Bar of the Small Magellanic Cloud
• The observed multiplicity properties of B-type stars in the Galactic young open cluster NGC 6231
• Red supergiant stars in binary systems II. Confirmation of B-type companions of red supergiants in the Small Magellanic Cloud using Hubble ultra-violet spectroscopy
• Modeling the H$\alpha$ Emission Surrounding Spica using the Lyman Continuum from a Gravity-darkened Central Star
• VLTI observations of the Orion Belt stars: I. eps Orionis
• The origin of B-type runaway stars based on kinematics
• $\delta$ Circini: A massive hierarchical triple system with an eclipsing binary
• Micro-turbulence across the Hertzsprung-Russell diagram. Observational constrains for stars in the MW
• A Young Eclipsing Binary and its Luminous Neighbors in the Embedded Star Cluster Sh 2-252E
• Variability of Galactic blue supergiants observed with TESS
• The feedback of massive stars on interstellar astrochemical processes
• A new sample of massive B-type contact binary candidates from the OGLE survey of the Magellanic Clouds
• NLTE analysis of spectra: OBA stars
• Determining stellar properties of massive stars in NGC346 in the SMC with a Bayesian statistic technique
• Discovery of a hot post-AGB star in Galactic globular cluster E3
• The He abundance in NGC 1850 A and B: are we observing the early stage of formation of multiple populations in a stellar cluster?
• Revealing the Binarity of HD 36030 -- One of the Hottest Flare Stars
• SALT spectroscopy of the HMXB associated with the LMC supernova remnant MCSNR\,J0513$-$6724
• EPIC 206197016: A very hot white dwarf orbited by a strongly irradiated red dwarf
• Properties of dwarf stars in Cygnus OB2
• Fundamental parameters of some B-type stars using NOAO Indo-U.S. Library
• Mass Transfer as an Explanation for the Lifetime-Travel Time Discrepancy in IT Librae
• The VLT-FLAMES survey of massive stars. NGC2004#115: A triple system hosting a possible short period B+BH binary
• The First Data Release of LAMOST Low Resolution Single Epoch Spectra
• An asteroseismic study of the Southern $\beta$ Cephei star \astrobj{ALS 3721}
• Variation of the stellar color in high-magnification and caustic-crossing microlensing events
• Polarization in caustic-crossing binary microlensing events
• Imladris: a detailed and flexible model for galaxy simulations with individual stars
• An attempt of seismic modelling of Beta Cephei stars in NGC 6910
• Modeling the Magnetosphere of the B2Vp star sigma Ori E
• Fe XVII $2p$-$3s$ line ratio diagnostic of shock formation radius in O stars
• PDRs4All XVIII. JWST-NIRCam Photometric properties of protoplanetary disks in the Orion Nebula Cluster
• Measuring the stellar atmosphere parameters using follow-up polarimetry microlensing observations
• Spectroscopic Line Modeling of the Fastest Rotating O-type Stars
• Infrared properties of Active OB stars in the Magellanic Clouds from the Spitzer SAGE Survey
• NGC 2004 #115: a black hole imposter containing three luminous stars
• A rare phosphorus-rich star in an eclipsing binary from TESS
• Analysis of B and Be Star Populations of the Double Cluster h and chi Persei
• Theoretical Spectra of the Am CVn Binary System SDSS J0926+3624 : Effects of Irradiation onto the Donor Stars
• Unraveling the variability of sigma Ori E
• A hybrid SLAM-Payne framework for atmospheric parameter and abundance determination of early-type Stars from LAMOST DR9 low-resolution Spectra
• Spectroscopic and photometric study of two B-type pulsators in eclipsing systems
• HD 188101: A Spotted B Star with Abundance Anomalies
• The symphony of pulsations and binarity among massive stars using HERMES spectroscopy and TESS photometry
• Observations of the Bright Star in the Globular Cluster 47 Tucanae (NGC 104)
• The X-shooter Spectral Library (XSL): Data Release 3
• Study of Massive OBA Stars with X-ray Emission