LAMOST J040901.83+329355.6 -- a new Galactic star with Wolf--Rayet characteristics on a post-AGB to CSPN transitional stage

Abstract

The similarity in physical conditions in winds of low-mass post-asymptotic giant branch stars and evolved massive stars leads to the appearance of an interesting phenomenon of spectral mimicry. Due to that the discovery of every new star with Wolf--Rayet spectrum requires special study of its evolutionary status before it may be included in the list of Galactic Wolf--Rayet (WR) stars. A couple of years ago LAMOST J040901.83+323955.6 (hereafter J0409+3239) was selected as a WR star in LAMOST spectroscopic database by machine learning methods. In this work we investigated its evolutionary status. Analyzing the spatial location of J0409+3239, in the Galaxy and its position in the color-magnitude diagram we concluded what J0409+3239, is instead a low mass object with WR phenomenon. Its luminosity is $L\ast =1000L_{\odot }$ and effective temperature $T_{\mathrm{eff}}$=40,000 K. Using new and archival photometric data we detected irregular variability on time scales from hours to tens of days with amplitude up to $\approx 0.2$ mag. Comparison of the spectrum obtained in 2022 with the one from 2014 also shows an evidence of spectral variability. The absence of clearly detected circumstellar nebula does not allow to classify J0409+3239, as [WR], i.e. a central star of planetary nebula (CSPN). However, its position in Hertzsprung--Russell diagram suggests that J0409+3239, is a low mass star caught in rare transitional phase to CSPN. Estimation of J0409+3239, mass based on evolutionary tracks shows that it is less than $0.9M_{\odot }$, and thus the age of the Galaxy is barely enough for the star to evolve to its current stage.

arXiv comment10 pages, 5 figures, 3 tables, accepted for publication in MNRAS

References in corpus (41)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• Gaia Data Release 2. Summary of the contents and survey properties
• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• The Gaia mission
• The Zwicky Transient Facility: System Overview, Performance, and First Results
• Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
• Grids of stellar models with rotation - I. Models from 0.8 to 120 Msun at solar metallicity (Z = 0.014)
• A 3D Dust Map Based on Gaia, Pan-STARRS 1 and 2MASS
• Physical Properties of Wolf-Rayet Stars
• The ASAS-SN Catalog of Variable Stars I: The Serendipitous Survey
• New models for the evolution of Post-Asymptotic Giant Branch stars and Central Stars of Planetary Nebulae
• Post-Asymptotic Giant Branch Evolution of Low- and Intermediate-Mass Stars. Preliminary Results
• A Wolf-Rayet-like progenitor of supernova SN 2013cu from spectral observations of a wind
• The Galactic WN stars: Spectral analyses with line-blanketed model atmospheres versus stellar evolution models with and without rotation
• The Element Abundances in Bare Planetary Nebula Central Stars and the Shell Burning in AGB Stars
• The Eddington factor as the key to understand the winds of the most massive stars. Evidence for a Gamma-dependence of Wolf-Rayet type mass loss
• The Galactic O-Star Spectroscopic Survey (GOSSS). III. 142 additional O-type systems
• Machine-Learned Identification of RR Lyrae Stars from Sparse, Multi-band Data: the PS1 Sample
• LAMOST Spectroscopic Survey of the Galactic Anti-centre (LSS-GAC): target selection and the first release of value-added catalogues
• Spatial distribution of Galactic Wolf-Rayet stars and implications for the global population
• Why binary interaction does not necessarily dominate the formation of Wolf-Rayet stars at low metallicity
• Red Eyes on Wolf-Rayet Stars: 60 New Discoveries via Infrared Color Selection
• Analysis of Far-UV Data of Central Stars of Planetary Nebulae: Occurrence and Variability of Stellar Winds
• Catalogue of central stars of planetary nebulae: Expanded edition
• A massive white-dwarf merger product before final collapse
• Optical spectrum of the IR-source IRC+10420 in 1992-1996
• Detailed Far-UV to Optical Analysis of Four [WR] Stars
• Ultra-deep GEMINI near-infrared observations of the bulge globular cluster NGC 6624
• A Near-Infrared Survey of the Inner Galactic Plane for Wolf-Rayet Stars II. Going Fainter: 71 More New WR Stars
• The Jets and and Supercritical Accretion Disk in SS433
• A catalogue of 323 cataclysmic variables from LAMOST DR6
• Active deep learning method for the discovery of objects of interest in large spectroscopic surveys
• Variability in Protoplanetary Nebulae: IX. Evidence for Evolution in a Decade
• Evolution of the central stars of young planetary nebulae
• Spectral variability of the IR-source IRAS 01005+7910 optical component
• Astronomical Camera Based on a CCD261-84 Detector with Increased Sensitivity in the Near-Infrared
• A New Transition Wolf-Rayet WN/C Star in the Milky Way
• Evolutionary stage of the spectral variable BD+48 1220=IRAS 05040+4820
• S-ACF: A selective estimator for the autocorrelation function of irregularly sampled time series
• FRAM telescopes and their measurements of aerosol content at the Pierre Auger Observatory and at future sites of the Cherenkov Telescope Array
• How long can LBVs sleep? A long-term photometric vaiability and spectral study of the Galactic candidate luminous blue variable MN112