TCP J18224935-2408280: a symbiotic star identified during outburst

Abstract

TCP J18224935-2408280 was reported to be in outburst on 2021 May 19. Follow-up spectroscopic observations confirmed that the system was a symbiotic star. We present optical spectra obtained from the Himalayan Chandra Telescope during 2021-22. The early spectra were dominated by Balmer lines, He I lines and high ionization lines such as He II. In the later observations, Raman scattered O VI was also identified. Outburst in the system started as a disc instability, and later the signature of enhanced shell burning and expansion of photospheric radius of the white dwarf was identified. Hence we suggest this outburst is of combination nova type. The post-outburst temperature of the hot component remains above 1.5 x 10${}^5$ K indicating a stable shell burning in the system for a prolonged time after the outburst. Based on our analysis of archival multiband photometric data, we find that the system contains a cool giant of M1-2 III spectral type with a temperature of $\sim$ 3600K and a radius of $\sim$ 69 R${}_{\odot }$. The pre- and post-outburst light curve shows a periodicity of 631.25 $\pm$ 2.93 d; we consider this as the orbital period.

arXiv comment10 pages, 12 figures, 3 table; published in MNRAS

References in corpus (28)

• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• Correcting for the Effects of Interstellar Extinction
• A new extensive library of PHOENIX stellar atmospheres and synthetic spectra
• Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
• MESA Isochrones and Stellar Tracks (MIST) 0: Methods for the construction of stellar isochrones
• The Man Behind the Curtain: X-rays Drive the UV through NIR Variability in the 2013 AGN Outburst in NGC 2617
• A 3D Dust Map Based on Gaia, Pan-STARRS 1 and 2MASS
• The NextGen Model Atmosphere grid for $3000\le \Teff \le 10000\K$
• The All-Sky Automated Survey for Supernovae (ASAS-SN) Light Curve Server v1.0
• The Revised TESS Input Catalog and Candidate Target List
• Models of Stars, Brown Dwarfs and Exoplanets
• The Pan-STARRS1 Database and Data Products
• SkyMapper Southern Survey: First Data Release (DR1)
• ARIADNE: Measuring accurate and precise stellar parameters through SED fitting
• Symbiotic stars in X-rays
• A "Combination Nova" Outburst in Z Andromedae: Nuclear Shell Burning Triggered by a Disk Instability
• A census of symbiotic stars in the 2MASS, WISE and Gaia surveys
• Large-amplitude variables in Gaia Data Release 2. Multi-band variability characterization
• Symbiotic stars: Observations confront theory
• Regulation of accretion by its outflow in a symbiotic star: the 2016 outflow fast state of MWC 560
• Activity cycle of the giant star of Z Andromedae and its spin period
• Disc instabilities and nova eruptions in symbiotic systems: RS Ophiuchi and Z Andromedae
• AG Pegasi - now a classical symbiotic star in outburst?
• OGLE-SMC-LPV-00861 (LIN 9): the first proven Z And outburst in a Magellanic symbiotic star
• The path to Z And-type outbursts: The case of V426 Sagittae (HBHA 1704-05)
• Hen 3-860: New southern eclipsing symbiotic star observed in the outburst

Cited by in corpus (3)

• Symbiotic stars in the era of modern ground- and space-based surveys
• V1047 Cen: The first Z And-type outburst observed in the classical nova binary
• The 2021 Hot-type Symbiotic Outburst of YY Herculis: An Optical Follow-up Study