A selection of hot subluminous stars in the GALEX survey II. Subdwarf atmospheric parameters

Abstract

We present an update of our low-resolution spectroscopic follow-up and model atmosphere analysis of hot subdwarf stars from the Galaxy Evolution Explorer (GALEX) survey. Targets were selected on the basis of colour indices calculated from the GALEX GR6 N_UV, Guide Star Catalogue (GSC2.3.2) V and the Two Micron All Sky Survey (2MASS) J and H photometry. High signal-to-noise ratio spectra were obtained at the European Southern Observatory (ESO) and the Kitt Peak National Observatory (KPNO) over the course of three years. Detailed H, He and CNO abundance analysis helped us improve our T_eff, log g and He abundance determination and to constrain CNO abundances. We processed 191 observations of 180 targets and found 124 sdB and 42 sdO stars in this sample while some blue horizontal branch stars were also found in this programme. With quantitative binary decomposition of 29 composite spectra we investigated the incidence of A, F and G type companions. The incidence of late G and K type companions and their effects on subdwarf atmospheric parameters were also examined.

arXiv comment33 pages, 25 figures and 6 tables. Accepted for publication in MNRAS. Typos corrected and note added in proof

References in corpus (41)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• MILES: A Medium resolution INT Library of Empirical Spectra
• The Origin of Subdwarf B Star (I): the Formation Channels
• A Grid of NLTE Line-Blanketed Model Atmospheres of O-type Stars
• The origin of sdB stars (II)
• A Grid of NLTE Line-Blanketed Model Atmospheres of Early B-type Stars
• The Second-Generation Guide Star Catalog: Description and Properties
• Ultraviolet Radiation from Evolved Stellar Populations -- I. Models
• A Catalog of Spectroscopically Confirmed White Dwarfs from the Sloan Digital Sky Survey Data Release 4
• The binary fraction of extreme horizontal branch stars
• The Origin of Extreme Horizontal Branch Stars
• Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters
• Far-Ultraviolet Radiation from Elliptical Galaxies
• Empirical calibration of the near-IR CaII triplet - IV. The stellar population synthesis models
• Can Planets Influence the Horizontal Branch Morphology?
• Close binary EHB stars from SPY
• A Far Ultraviolet Analysis of the Stellar Populations in Six Elliptical and S0 Galaxies
• Hot subdwarfs from the ESO Supernova Ia Progenitor Survey: II. Atmospheric parameters of subdwarf O stars
• Modeling He-rich subdwarfs through the hot-flasher Scenario
• Spectral analysis of sdB stars from the Hamburg Quasar Survey
• Hot subdwarfs from the ESO Supernova Ia Progenitor Survey - I. Atmospheric parameters and cool companions of sdB stars
• The MUCHFUSS project - Searching for hot subdwarf binaries with massive unseen companions: Survey, target selection and atmospheric parameters
• Abundance studies of sdB stars using UV echelle HST/STIS spectroscopy
• Gravity-mode pulsations in subdwarf B stars: a critical test of stellar opacity
• Flash Mixing on the White Dwarf Cooling Curve: FUSE Observations of three He-rich sdB Stars
• First Kepler results on compact pulsators VI. Targets in the final half of the survey phase
• A survey for pulsating subdwarf B stars with the Nordic Optical Telescope
• The shortest period sdB plus white dwarf binary CD-30 11223 (GALEX J1411-3053)
• Mass-loss and diffusion in subdwarf B stars and hot white dwarfs: do weak winds exist?
• Single and Composite Hot Subdwarf Stars in the Light of 2MASS Photometry
• Discovery of a Bright, Extremely Low-Mass White Dwarf in a Close Double Degenerate System
• A selection of hot subluminous stars in the GALEX survey I. Correlation with the Guide Star Catalog
• A seismic approach to testing different formation channels of subdwarf B stars
• PHL 932: when is a planetary nebula not a planetary nebula?
• KIC 1718290: A Helium-rich V1093-Her-like Pulsator on the Blue Horizontal Branch
• The fast rotating, low gravity subdwarf B star EC 22081-1916 - Remnant of a common envelope merger event
• The Unseen Population of F to K-type Companions to Hot Subdwarf Stars
• J08069+1527: A newly discovered high amplitude, hybrid subdwarf B pulsator
• Two new hot subdwarf binaries in the GALEX survey
• Identification of blue high proper motion objects in the Tycho-2 and 2MASS catalogues using Virtual Observatory tools
• Hot subdwarf binaries - Masses and nature of their heavy compact companions

Cited by in corpus (97)

• Hot subluminous stars
• New white dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 12
• New white dwarf stars in the Sloan Digital Sky Survey Data Release 10
• The fastest unbound star in our Galaxy ejected by a thermonuclear supernova
• Hot subdwarf binaries from the MUCHFUSS project - Analysis of 12 new systems and a study of the short-period binary population
• A progenitor binary and an ejected mass donor remnant of faint type Ia supernovae
• An unusual white dwarf star may be a surviving remnant of a subluminous Type Ia supernova
• Population of hot subdwarf stars studied with Gaia III. Catalogue of known hot subdwarf stars: Data Release 2
• The orbits of subdwarf-B + main-sequence binaries. II. Three eccentric systems; BD+29 3070, BD +34 1543 and Feige 87
• The population of hot subdwarf stars studied with Gaia -- IV. Catalogues of hot subluminous stars based on Gaia EDR3
• New binaries among UV-selected, hot subdwarf stars and population properties
• Discovery of extremely lead-rich subdwarfs: does heavy metal signal the formation of subdwarf B stars?
• The catalogue of radial velocity variable hot subluminous stars from the MUCHFUSS project
• Alone but not lonely: Observational evidence that binary interaction is always required to form hot subdwarf stars
• Hot subdwarfs in close binaries observed from space I: orbital, atmospheric, and absolute parameters and the nature of their companions
• Composite hot-subdwarf binaries -- I. The spectroscopically confirmed sdB sample
• Asteroseismology revealing trapped modes in KIC 10553698A
• On helium-dominated stellar evolution: the mysterious role of the O(He)-type stars
• Discovery of a variable lead-rich hot subdwarf: UVO 0825+15
• Hot Subdwarf Stars Observed in LAMOST DR1 - Atmospheric parameters from single-lined spectra
• KIC7668647: a 14 day beaming sdB+WD binary with a pulsating subdwarf
• Subdwarf B stars from the common envelope ejection channel
• New hot subdwarf stars identified in Gaia DR2 with LAMOST DR5 spectra
• Hot subdwarf Atmospheric parameters, Kinematics, and Origins -- Based on 1587 hot subdwarf stars observed in Gaia DR2 and LAMOST DR7
• New hot subdwarf stars identified in Gaia DR2 with LAMOST DR5 spectra -- II
• Hot subdwarf stars observed in Gaia DR2 and LAMOST DR5
• Evolution models of helium white dwarf--main sequence star merger remnants
• Hot subdwarf stars identified in Gaia DR2 with spectra of LAMOST DR6 and DR7 I. Single-lined spectra
• TESS first look at evolved compact pulsators : Discovery and asteroseismic probing of the g-mode hot B subdwarf pulsator EC 21494-7018
• The SALT survey of helium-rich hot subdwarfs: methods, classification, and coarse analysis
• Radial velocity variability and evolution of hot subdwarf stars
• Hydrogen in hot subdwarfs formed by double helium white dwarf mergers
• Analysis of cool DO-type white dwarfs from the Sloan Digital Sky Survey Data Release 10
• The enigmatic He-sdB pulsator LS IV$-$14${}^{\circ }$116: new insights from the VLT
• Hot subdwarf stars identified in LAMOST DR8 with single-lined and composite spectra
• SHOTGLAS I: The ultimate spectroscopic census of extreme horizontal branch stars in $\omega$ Centauri
• Short-period pulsating hot-subdwarf stars observed by TESS I. Southern ecliptic hemisphere
• A Helium-Carbon Correlation on the Extreme Horizontal Branch in $\omega$ Centauri
• Asteroseismic analysis of variable hot subdwarf stars observed with TESS I. The mean g-mode period spacings in hot subdwarf B stars
• HE 0430-2457: a post merger extremely low-mass pre-white dwarf in a wide binary posing as an extreme horizontal branch star
• The effects of diffusion in hot subdwarf progenitors from the common envelope channel
• Extremely low-mass white dwarf stars observed in Gaia DR2 and LAMOST DR8
• New Variable Hot Subdwarf Stars Identified from Anomalous Gaia Flux Errors, Observed by TESS, and Classified via Fourier Diagnostics
• The population of hot subdwarf stars studied with Gaia I. The catalogue of known hot subdwarf stars
• Heavy-metal enrichment of intermediate He-sdOB stars: the pulsators Feige 46 and LS IV -14 116 revisited
• The MUCHFUSS photometric campaign
• GALEX J184559.8-413827: a new extreme helium star identified using SALT
• Mode identification in three pulsating hot subdwarfs observed with TESS satellite
• An extremely fast halo hot subdwarf star in a wide binary system
• Hot subdwarfs in close binaries observed from space II: Analysis of the light curves
• A search for heavy-metal stars: abundance analyses of hot subdwarfs with Subaru
• Hot Subdwarf Stars Identified in Gaia DR2 with Spectra of LAMOST DR6 and DR7. II. Kinematics
• Discovery of hot subdwarfs with extremely high carbon and oxygen abundances
• Filling the gap between synchronized and non-synchronized sdBs in short-period sdBV+dM binaries with TESS: TIC 137608661, a new system with a well defined rotational splitting
• Looking at the bright side - The story of AA Dor as revealed by its cool companion
• Three new pulsating sdB stars discovered with SuperWASP
• An 18.9-minute Blue Large-Amplitude Pulsator Crossing the 'Hertzsprung Gap' of Hot Subdwarfs
• Hot Subdwarf All Southern Sky Fast Transit Survey with the Evryscope
• A quantitative NLTE analysis of visual and ultraviolet spectra of four helium-rich subdwarf O stars
• A search for new hot subdwarf stars by means of Virtual Observatory tools II
• A seven-Earth-radius helium-burning star inside a 20.5-min detached binary
• PHL 417: a zirconium-rich pulsating hot subdwarf (V366 Aquarid) discovered in K2 data
• Spectral analysis of four surprisingly similar hot hydrogen-rich subdwarf O stars
• Hot subdwarf stars in close-up view IV. Helium abundances and the ${}^3$He isotopic anomaly of subdwarf B star
• Interesting Features in the Combined GALEX and Sloan Color Diagrams of Solar-like Galactic Populations
• A new sdO+dM binary with extreme eclipses and reflection effect
• Searching for Hot Subdwarf Stars in LAMOST DR1-II. Pure spectroscopic identification method for hot subdwarfs
• The first heavy-metal hot subdwarf composite binary SB 744
• Binaries discovered by the MUCHFUSS project; FBS 0117+396: An sdB+dM binary with a pulsating primary
• Discovery of new TESS pulsating hot subdwarfs
• Orbital and atmospheric parameters of two wide O-type subdwarf binaries: BD$-$11${}^{\mathrm{o}}$162 and Feige 80
• Mass distribution for single-lined hot subdwarf stars in LAMOST
• Surface abundance and the hunt for stratification in chemically peculiar hot subdwarfs: PG 0909+276 and UVO 0512-08
• Orbital Characteristics of the Subdwarf-B and F V Star Binary EC~20117-4014(=V4640 Sgr)
• Constraints on the winds of hot subdwarf stars from X-ray observations of two sdB binaries with compact companions: CD -30 11223 and PG 1232-136
• Evolutionary Constraints on the Long-period Subdwarf B Binary PG 1018-047
• Non-local thermodynamic equilibrium spectral analysis of five hot, hydrogen-deficient pre-white dwarfs
• A search for new hot subdwarf stars by means of Virtual Observatory tools
• Identification of new hot subdwarf binary systems by means of Virtual Observatory tools
• Improved determination of the atmospheric parameters of the pulsating sdB star Feige 48
• A 500 pc volume-limited sample of hot subluminous stars II. Atmospheric parameters, mass distribution, and kinematics
• Hot subdwarfs - Small stars marking important events in stellar evolution
• A Grid of Synthetic Spectra for Subdwarfs: Non-LTE line-blanketed atmosphere models
• Understanding the rotational variability of K2 targets. HgMn star KIC 250152017 and blue horizontal branch star KIC 249660366
• Pulsating subdwarf B stars in the oldest open cluster NGC6791
• Unveiling the evolutionary state of three B supergiant stars: PU Gem, $\epsilon$ CMa and $\eta$ CMa
• Hot subdwarf stars from the Hamburg Quasar Survey
• Variable Blue Straggler Stars in Open Cluster NGC 6819 Observed in the Kepler 'Superstamp' Field
• Detection of hot subdwarf binaries and sdB stars using machine learning methods and a large sample of Gaia XP spectra
• Wide sdB binaries. I. Orbital and atmospheric parameters
• Revealing the Binarity of HD 36030 -- One of the Hottest Flare Stars
• Stars on the ascending helium giant branch I. From white dwarf merger to helium giant: the evolutionary state of the rapidly rotating hot subdwarf HE 1518-0948
• Exploring Late Stellar Evolution in the Era of Large Surveys: Machine Learning Prospects for Hot Subdwarfs and White Dwarfs
• Hot subdwarfs from the surviving companions of the white dwarf + main-sequence channel of Type Ia supernovae
• EC 22536-5304: a lead-rich and metal-poor long-period binary
• Stellar Parameters and Orbital Period Estimates for Composite-Spectrum sdB+MS Binaries from LAMOST
• Rotational broadening and conservation of angular momentum in post-extreme horizontal branch stars