MN48: a new Galactic bona fide luminous blue variable revealed by Spitzer and SALT

Abstract

In this paper, we report the results of spectroscopic and photometric observations of the candidate evolved massive star MN48 disclosed via detection of a mid-infrared circular shell around it with the Spitzer Space Telescope. Follow-up optical spectroscopy of MN48 with the Southern African Large Telescope (SALT) carried out in 2011--2015 revealed significant changes in the spectrum of this star, which are typical of luminous blue variables (LBVs). The LBV status of MN48 was further supported by photometric monitoring which shows that in 2009--2011 this star has brightened by approx 0.9 and 1 mag in the V and I_c bands, respectively, then faded by approx 1.1 and 1.6 mag during the next four years, and apparently started to brighten again recently. The detected changes in the spectrum and brightness of MN48 make this star the 18th known Galactic bona fide LBV and increase the percentage of LBVs associated with circumstellar nebulae to more than 70 per cent. We discuss the possible birth place of MN48 and suggest that this star might have been ejected either from a putative star cluster embedded in the HII region IRAS 16455-4531 or the young massive star cluster Westerlund 1.

11 pages, 10 figures, accepted for publication in MNRAS

References in corpus (44)

• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• The Infrared Array Camera (IRAC) for the Spitzer Space Telescope
• The USNO-B Catalog
• Local Kinematics and the Local Standard of Rest
• Las Cumbres Observatory Global Telescope Network
• VVV DR1: The First Data Release of the Milky Way Bulge and Southern Plane from the Near-Infrared ESO Public Survey VISTA Variables in the Via Lactea
• UBVJHK synthetic photometry of Galactic O stars
• On the massive stellar population of the Super Star Cluster Westerlund 1
• A Trigonometric Parallax of Sgr B2
• A general catalogue of 6.7 GHz methanol masers. I: data
• First science with SALT: peering at the accreting polar caps of the eclipsing polar SDSS J015543.40+002807.2
• The Origin of OB Runaway Stars
• Strong Emission Line HII Galaxies in the Sloan Digital Sky Survey. I. Catalog of DR1 Objects with Oxygen Abundances from Te easurements
• Luminous Blue Variables as the progenitors of supernovae with quasi-periodic radio modulations
• Fundamental properties of core-collapse Supernova and GRB progenitors: predicting the look of massive stars before death
• On the nature of the prototype LBV AG Carinae I. Fundamental parameters during visual minimum phases and changes in the bolometric luminosity during the S-Dor cycle
• A Hidden Population of Massive Stars with Circumstellar Shells Discovered with the Spitzer Space Telescope
• Massive star evolution: Luminous Blue Variables as unexpected Supernova progenitors
• The population of OB supergiants in the starburst cluster Westerlund 1
• Revealing evolved massive stars with Spitzer
• Field O stars: formed in situ or as runaways?
• Runaway massive stars from R136: VFTS 682 is very likely a "slow runaway"
• The distance and neutral environment of the massive stellar cluster Westerlund 1
• The metallicity extremes of the Sagittarius dSph using SALT spectroscopy of PNe
• Interstellar Weather Vanes: GLIMPSE Mid-Infrared Stellar-Wind Bowshocks in M17 and RCW49
• A Catalog of MIPSGAL Disk and Ring Sources
• Very massive runaway stars from three-body encounters
• Search for OB stars running away from young star clusters. II. The NGC 6357 star-forming region
• Luminous and Variable Stars in M31 and M33. II. Luminous Blue Variables, Candidate LBVs, Fe II Emission Line Stars, and Other Supergiants
• A VLT/FLAMES survey for massive binaries in Westerlund 1: I. first observations of luminous evolved stars
• On the nature of the prototype LBV AG Carinae II. Witnessing a massive star evolving close to the Eddington and bistability limits
• A newly identified Luminous Blue Variable in the galactic starburst cluster Westerlund 1
• Discovery of two new Galactic candidate luminous blue variables with WISE
• The Fundamental Parameters of Four Massive Eclipsing Binaries in Westerlund 1
• Fundamental Parameters of four Massive Eclipsing Binaries in Westerlund 1
• Palomar/TripleSpec observations of {\it Spitzer}/MIPSGAL~24\mic\ circumstellar shells: unveiling the nature of their central sources
• The blue supergiant MN18 and its bipolar circumstellar nebula
• Spitzer/IRS investigation of MIPSGAL 24 microns compact bubbles
• WS1: one more new Galactic bona fide luminous blue variable
• MN112: a new Galactic candidate Luminous Blue Variable
• Spitzer/infrared spectrograph investigation of MIPSGAL 24 μm compact bubbles : Low resolution observations
• Discovery of a new bona fide luminous blue variable in Norma
• Discovery of a new Galactic bona fide luminous blue variable with Spitzer
• New Galactic Candidate Luminous Blue Variables and Wolf-Rayet Stars

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