Spectroscopic and photometric monitoring of a poorly known high-luminous OH/IR star: IRAS 18278+0931

Abstract

We present the time-dependent properties of a poorly known OH/IR star $-$ IRAS 18278+0931 (hereafter, IRAS 18+09) towards the Ophiuchus constellation. We have carried out long-term optical/near-infrared (NIR) photometric and spectroscopic observations to study the object. From optical $R$- and $I$-band light curves, the period of IRAS 18+09 is estimated to be 575 $\pm$ 30 days and the variability amplitudes range from $\Delta$R $\sim$ 4.0 mag to $\Delta$I $\sim$ 3.5 mag. From the standard Period-Luminosity (PL) relations, the distance ($D$) to the object, 4.0 $\pm$ 1.3 kpc, is estimated. Applying this distance in the radiative transfer model, the spectral energy distribution (SED) are constructed from multi-wavelength photometric and IRAS-LRS spectral data which provides the luminosity, optical depth, and gas mass-loss rate (MLR) of the object to be 9600 $\pm$ 500 $L_{\odot }$, 9.1 $\pm$ 0.6 at 0.55 $\mu$m and 1.0$\times$10${}^{-6}$ M${}_{\odot }$ yr${}^{-1}$, respectively. The current mass of the object infers in the range 1.0 $-$ 1.5 $M_{\odot }$ assuming solar metallicity. Notably, the temporal variation of atomic and molecular features (e.g., TiO, Na I, Ca I, CO, H${}_2$O) over the pulsation cycle of the OH/IR star illustrates the sensitivity of the spectral features to the dynamical atmosphere as observed in pulsating AGB stars.

arXiv comment14 pages, 7 figures, 5 tables. Accepted for publication in AJ

References in corpus (32)

• 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
• A grid of MARCS model atmospheres for late-type stars I. Methods and general properties
• The VizieR database of Astronomical Catalogues
• The Milky Way Tomography with SDSS: I. Stellar Number Density Distribution
• The Infrared Telescope Facility (IRTF) Spectral Library: Cool Stars
• The AKARI/IRC Mid-Infrared All-Sky Survey
• Self-similarity and scaling behavior of IR emission from radiatively heated dust: I. Theory
• Metallicity and Temperature Indicators in M dwarf K band Spectra: Testing New & Updated Calibrations With Observations of 133 Solar Neighborhood M dwarfs
• Evolution of Thermally Pulsing Asymptotic Giant Branch Stars I. The COLIBRI Code
• Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18
• Probing the mass-loss history of AGB and red supergiant stars from CO rotational line profiles - II. CO line survey of evolved stars: derivation of mass-loss rate formulae
• Near-infrared Metallicities, Radial Velocities and Spectral Types for 447 Nearby M Dwarfs
• Preplanetary Nebulae: An HST Imaging Survey and a New Morphological Classification System
• The mid- and far-infrared colours of AGB and post-AGB stars
• Line formation in AGB atmospheres including velocity effects. Molecular line profile variations of long period variables
• The ATCA/VLA OH 1612 MHz survey. III. Northern Galactic Plane
• An Accurate, Easy to Use Abundace Scale for Globular Clusters Based on 2.2um Spectra of Giant Stars
• A New Approach to the Study of Stellar Populations in Early-Type Galaxies: K-band Spectral Indices and an Application to the Fornax Cluster
• Period-Magnitude relation of Mira-like variables in the Large Magellanic Cloud as a tool to understand circumstellar extinction
• Large Magellanic Cloud Near-Infrared Synoptic Survey. V. Period-Luminosity Relations of Miras
• Phase Dependent Spectroscopy of Mira Variable Stars
• Pulsation-induced atmospheric dynamics in M-type AGB stars. Effects on wind properties, photometric variations and near-IR CO line profiles
• Study of extremely reddened AGB stars in the Galactic bulge
• IRAS 19520+2759: a 10^5 Lsun massive young stellar object driving a collimated outflow
• On the detection of CO and mass loss of Bulge OH/IR stars
• Near-IR spectroscopy of OH/IR stars in the Galactic Centre
• Does Cyg X-1 have a small Standard Accretion Disc?
• Phase-dependent photometric and spectroscopic characterization of the MASTER-Net Optical Transient J212444.87+321738.3: an oxygen rich Mira
• Spectral Calibration of K$-$M Giants from medium resolution near-infrared HK-band spectra
• Preliminary Analysis of ULPC Light Curves Using Fourier Decomposition Technique

Cited by in corpus (2)

• $H$-band Temperature and Metallicity Indicators for Cool Giants: Empirical Relations in Bayesian Framework
• TIFR Treasures for Astronomy from Ground to Space