Photometric and spectroscopic analysis of LBV candidate J004341.84+411112.0 in M31

Abstract

We study Luminous Blue Variable (LBV) candidate J004341.84+411112.0 in the Andromeda galaxy. We present optical spectra of the object obtained with the 6-m telescope of SAO RAS. The candidate shows typical LBV features in its spectra: broad and strong hydrogen lines and the He I lines with P Cigni profiles. Its remarkable spectral resemblance to the well known LBV P Cygni suggests a common nature of the objects and supports LBV classification of J004341.84+411112.0. We estimate the temperature, reddening, radius and luminosity of the star using its spectral energy distribution. Obtained bolometric luminosity of the candidate ($M_{\text{bol}}=-10.41\pm 0.12$ mag) is quite similar to those of known LBV stars in the Andromeda galaxy. We analysed ten year light curve of the object in $R$ filter. The candidate demonstrates photometric variations of the order of 0.4 mag, with an overall brightness increasing trend $\Delta R>0.1$ mag. Therewith, the corresponding colour variations of the object are fully consistent with LBV behavior when a star become cooler and brighter in the optical spectral range with a nearly constant bolometric luminosity. LBV-type variability of the object, similarity of its spectrum and estimated luminosity to those of known LBVs allows us to classify J004341.84+411112.0 as a LBV.

References in corpus (23)

• Correcting for the Effects of Interstellar Extinction
• The Pan-STARRS1 Photometric System
• The Mauna Kea Observatories Near-Infrared Filter Set. II. Specifications for a New JHKL'M' Filter Set for Infrared Astronomy
• A Survey of Local Group Galaxies Currently Forming Stars. I. UBVRI Photometry of Stars in M31 and M33
• The SCORPIO focal reducer
• The Mauna Kea Observatories Near-Infrared Filter Set. I: Defining Optimal 1-5 $\mu$m Bandpasses
• The Mauna Kea Observatories Near-Infrared Filter Set. III. Isophotal Wavelengths and Absolute Calibration
• A Survey of Local Group Galaxies Currently Forming Stars: III. A Search for Luminous Blue Variables and Other H-alpha Emission-Lined Stars
• JHK Observations of Faint Standard Stars in the Mauna Kea Near-Infrared Photometric System
• Cepheid Period-Luminosity Relations in the Near-Infrared and the Distance to M31 from the Hubble Space Telescope Wide Field Camera 3
• Photometric Variability at the L/T Dwarf Boundary
• A Spectroscopic Survey of Massive Stars in M31 and M33
• Luminous and Variable Stars in M31 and M33. II. Luminous Blue Variables, Candidate LBVs, Fe II Emission Line Stars, and Other Supergiants
• ASTRONIRCAM - infrared camera-spectrograph for Sternberg institute 2.5 METER TELESCOPE
• Luminous and Variable Stars in M31 and M33. IV. Luminous Blue Variables, Candidate LBVs, and the B[e] Supergiants; How to Tell Them Apart
• On the Gaia DR2 distances for Galactic Luminous Blue Variables
• New Luminous Blue Variables in the Andromeda galaxy
• Luminous and Variable Stars in M31 and M33 V. The Upper HR Diagram
• The Discovery of a P Cygni Analog in M31
• Multi-Epoch BVRI Photometry of Luminous Stars in M31 and M33
• Luminous Blue Variable candidates in M31
• Modeling spectra of MN112
• The extended disc and halo of the Andromeda galaxy observed with Spitzer-IRAC

Cited by in corpus (1)

• A machine-learning photometric classifier for massive stars in nearby galaxies II. The catalog