Optically Visible Post-AGB Stars, Post-RGB Stars and Young Stellar Objects in the Large Magellanic Cloud

Abstract

We have carried out a search for optically visible post-Asymptotic Giant Branch (post-AGB) stars in the Large Magellanic Cloud (LMC). First, we selected candidates with a mid-IR excess and then obtained their optical spectra. We disentangled contaminants with unique spectra such as M-stars, C-stars, planetary nebulae, quasi-stellar objects and background galaxies. Subsequently, we performed a detailed spectroscopic analysis of the remaining candidates to estimate their stellar parameters such as effective temperature, surface gravity (log g), metallicity ([Fe/H]), reddening and their luminosities. This resulted in a sample of 35 likely post-AGB candidates with late-G to late-A spectral types, low log g, and [Fe/H] < -0.5. Furthermore, our study confirmed the existence of the dusty post-Red Giant Branch (post-RGB) stars, discovered previously in our SMC survey, by revealing 119 such objects in the LMC. These objects have mid-IR excesses and stellar parameters (Teff, log g, [Fe/H]) similar to those of post-AGB stars except that their luminosities (< 2500 Lsun), and hence masses and radii, are lower. These post-RGB stars are likely to be products of binary interaction on the RGB. The post-AGB and post-RGB objects show SED properties similar to the Galactic post-AGB stars, where some have a surrounding circumstellar shell, while some others have a surrounding stable disc similar to the Galactic post-AGB binaries. This study also resulted in a new sample of 162 young stellar objects, identified based on a robust log g criterion. Other interesting outcomes include objects with an UV continuum and an emission line spectrum; luminous supergiants; hot main-sequence stars; and 15 B[e] star candidates, 12 of which are newly discovered in this study.

Published in MNRAS 64 pages, 14 figures, 8 tables, 3 appendices. arXiv admin note: text overlap with arXiv:1402.5954

References in corpus (22)

• The Dawes Review 2: Nucleosynthesis and stellar yields of low and intermediate-mass single stars
• The Second-Generation Guide Star Catalog: Description and Properties
• New Grids of ATLAS9 Model Atmospheres
• Scaled solar tracks and isochrones in a large region of the Z-Y plane I. From the ZAMS to the TP-AGB end for 0.15 - 2.5 Mo stars
• Stellar Models and Yields of Asymptotic Giant Branch Stars
• Spitzer SAGE Infrared Photometry of Massive Stars in the Large Magellanic Cloud
• Spitzer SAGE survey of the Large Magellanic Cloud II: Evolved Stars and Infrared Color Magnitude Diagrams
• Keplerian discs around post-AGB stars: a common phenomenon?
• An evolutionary catalogue of Galactic post-AGB and related objects
• Optically visible post-AGB/RGB stars and young stellar objects in the Small Magellanic Cloud: candidate selection, spectral energy distributions and spectroscopic examination
• Spitzer Space Telescope spectra of post-AGB stars in the Large Magellanic Cloud ---polycyclic aromatic hydrocarbons at low metallicities
• A New Population of Planetary Nebulae Discovered in the Large Magellanic Cloud (II): Complete PN Catalogue
• The Evolution of Massive YSOs in the LMC: Part I. Identification and Spectral Classification
• Multi-Object Spectroscopy Field Configuration by Simulated Annealing
• Red Supergiant Stars in the Large Magellanic Cloud: I. The Period-Luminosity Relation
• Discovery of 5000 Active Galactic Nuclei behind the Magellanic Clouds
• A Post-AGB Star in the Small Magellanic Cloud Observed with the Spitzer Infrared Spectrograph
• The circumbinary disc around the J-type C-star IRAS 18006-3213
• SPITZER SAGE Observations of Large Magellanic Cloud Planetary Nebulae
• An interferometric study of the post-AGB binary 89 Herculis I Spatially resolving the continuum circumstellar environment at optical and near-IR wavelengths with the VLTI, NPOI, IOTA, PTI, and the CHARA Array
• A multiwavelength analysis of planetary nebulae in the Large Magellanic Cloud
• A New Population of Planetary Nebulae Discovered in the Large Magellanic Cloud (IV): The Outer LMC

Cited by in corpus (60)

• The Lazy Giants: APOGEE Abundances Reveal Low Star Formation Efficiencies in the Magellanic Clouds
• Orbital properties of binary post-AGB stars
• Heavy-element yields and abundances of Asymptotic Giant Branch models with a Small Magellanic Cloud metallicity
• Final Targeting Strategy for the SDSS-IV APOGEE-2S Survey
• A census of symbiotic stars in the 2MASS, WISE and Gaia surveys
• A newly discovered stellar type: dusty post-red giant branch stars in the Magellanic Clouds
• No signature of the orbital motion of a putative 70 solar mass black hole in LB-1
• The SAGE-Spec Spitzer Legacy program: The life-cycle of dust and gas in the Large Magellanic Cloud. Point source classification III
• Imaging the dust sublimation front of a circumbinary disk
• Learning about the intermediate neutron-capture process from lead abundances
• Establishing binarity amongst Galactic RV Tauri stars with a disc
• Detailed homogeneous abundance studies of 14 Galactic s-process enriched post-AGB stars: In search of lead (Pb)
• A population of transition disks around evolved stars: Fingerprints of planets? Catalog of disks surrounding Galactic post-AGB binaries
• A mid-IR interferometric survey with MIDI/VLTI: resolving the second-generation protoplanetary disks around post-AGB binaries
• Post-AGB stars in the Magellanic Clouds and neutron-capture processes in AGB stars
• Modelling depletion by re-accretion of gas from a dusty disc in post-AGB stars
• The perturbed sublimation rim of the dust disk around the post-AGB binary IRAS08544-4431
• Chemical abundance study of two strongly s-process enriched post-AGB stars in the LMC: J051213.81-693537.1 and J051848.86-700246.9
• A plethora of new R Coronae Borealis stars discovered from a dedicated spectroscopic follow-up survey
• Disc-binary interactions in depleted post-AGB binaries
• Luminosities and masses of single Galactic Post-Asymptotic Giant Branch (Post-AGB) stars with distances from $Gaia$ EDR3: The revelation of an $s$-process diversity
• A spatio-kinematic model for jets in post-AGB stars
• The evolutionary nature of RV Tauri stars in the SMC and LMC
• Luminosities and infrared excess in Type II and anomalous Cepheids in the Large and Small Magellanic Clouds
• HD101584: Circumstellar characteristics and evolutionary status
• Hot Subdwarf All Southern Sky Fast Transit Survey with the Evryscope
• The spectroscopic binaries RV Tauri and DF Cygni
• The most metal-rich asymptotic giant branch stars
• Resolved imaging of the AR Puppis circumbinary disk
• Understanding dust production and mass loss on the AGB phase using post-AGB stars in the Magellanic Clouds
• Physical properties of galactic RV Tauri stars from Gaia DR2 data
• Jet parameters for a diverse sample of jet-launching post-AGB binaries
• A study of carbon-rich post-AGB stars in the Milky Way to understand the production of carbonaceous dust from evolved stars
• Characterization of M-stars in the LMC in the JWST era
• What does a typical full-disc around a post-AGB binary look like? -- Radiative transfer models reproducing PIONIER, GRAVITY, and MATISSE data
• GK Car and GZ Nor: Two low-luminous, depleted RV Tauri stars
• The VMC Survey -- XLIX. Discovery of a population of quasars dominated by nuclear dust emission behind the Magellanic Clouds
• Second-generation protoplanetary discs around evolved binaries: a high-resolution polarimetric view with SPHERE/IRDIS
• Rapid grain growth in post-AGB disc systems from far-infrared and sub-millimetre photometry
• A study of oxygen-rich post-AGB stars in the Milky Way to understand the production of silicates from evolved stars
• Magnetically driven winds from accretion disks in post-asymptotic giant branch binaries
• Investigation of faint galactic carbon stars from the first Byurakan spectral survey. III. Infrared characteristics
• s-process Enriched Evolved Binaries in the Galaxy and the Magellanic Clouds
• VLTI/PIONIER reveals the close environment of the evolved system HD101584
• Multiwavelength high-resolution polarimetric imaging of second-generation disc around post-AGB binary IRAS 08544-4431 with SPHERE
• Variability in Proto-Planetary Nebulae: VIII. A New Sample of Southern Hemisphere Objects
• Jet formation in post-AGB binaries: Confronting cold magnetohydrodynamic disc wind wind models with observations
• Post-AGB Binaries as Interacting Systems
• Common Envelope Mass Ejection in Evolved Stars: Modeling the Dust Emission from post-RGB stars in the LMC
• Validating post-AGB candidates in the LMC and SMC using SALT spectra
• Machine Learning Classification of Young Stellar Objects and Evolved Stars in the Magellanic Clouds Using the Probabilistic Random Forest Classifier
• Gaia DR2 and EDR3 data and evolutionary status of post-AGB stars with high radial velocities
• Modelling the impact of circumbinary disk accretion on post-AGB binary evolution and surface chemistry
• The Stripped-Star Ultraviolet Magellanic Cloud Survey (SUMS): The UV Photometric Catalog and Stripped Star Candidate Selection
• Post-AGB nebular studies
• SPHERE/ZIMPOL insights into discs around evolved stars: arcs, asymmetries and dust properties
• A Census of B[e] Supergiants
• Decoding the RVb Enigma of DF Cyg: Pulsations, Circumstellar Disks, and Post-RGB Evolution Revealed by Multi-Wavelength Observations
• A search for Galactic post-asymptotic giant branch stars in Gaia DR3
• A homogeneous distance catalogue for Galactic RV Tauri objects