Hen 3-860: New southern eclipsing symbiotic star observed in the outburst

Abstract

Brightening of Hen 3-860, previously classified as an H$\alpha$ emitter, was detected by the ASAS-SN survey at the end of the year 2016. We have obtained the first spectroscopic observations of the transient and supplemented them with photometric data from the DASCH archive of astronomical plates, ASAS and ASAS-SN surveys. Based on the results of our analysis, we can classify the object as a classical symbiotic star of the infrared type S, consisting of an M2-3 giant with $T_{\mathrm{g}}$ $\sim$ 3 550 K, a radius $R_{\mathrm{g}}\sim$ 60 - 75 R${}_{\odot }$, and a luminosity $L_{\mathrm{g}}\sim$ 540 - 760 L${}_{\odot }$, and a hot and luminous component ($T_{\mathrm{h}}$ $\sim$ $1-2\times 10^5$ K and $L_{\mathrm{h}}\sim 10^3{\mathrm{L}}_{\odot }$). The system experienced at least four outbursts in the last 120 years. In addition to the outbursts, its light curves revealed the presence of eclipses of the hot component and its surrounding (relatively cool) shell, which developed during the outburst and redistributed a fraction of the radiation of the hot component into the optical, by the giant, classifying the object as a representative of a group of eclipsing symbiotic stars. The eclipses allowed us to reveal the orbital period of the system to be 602 days.

accepted for publication in MNRAS; 9 pages, 7 figures

References in corpus (11)

• Gaia Early Data Release 3: The astrometric solution
• A machine learning approach for identification and classification of symbiotic stars using 2MASS and WISE
• Large-amplitude variables in Gaia Data Release 2. Multi-band variability characterization
• The GALAH Survey and Symbiotic Stars. I. Discovery and follow-up of 33 candidate accreting-only systems
• The symbiotic recurrent nova V3890 Sgr: binary parameters and pre-outburst activity
• Gaia18aen: First symbiotic star discovered by Gaia
• Spectroscopic and photometric analysis of symbiotic candidates -- I. Ten candidates on classical symbiotic stars
• Discovery of five new Galactic symbiotic stars in the VPHAS+ survey
• Statistical relations between stellar spectral and luminosity classes and stellar effective temperature and surface gravity
• OGLE-SMC-LPV-00861 (LIN 9): the first proven Z And outburst in a Magellanic symbiotic star
• FUSE Spectroscopy of the Accreting Hot Components in Symbiotic Variables

Cited by in corpus (8)

• Symbiotic stars in the era of modern ground- and space-based surveys
• Where are the missing symbiotic stars? Uncovering hidden Symbiotic Stars in public catalogues
• The formation of the magnetic symbiotic star FN Sgr
• V618 Sgr: Galactic eclipsing symbiotic nova detected in repeated outbursts
• DeGaPe 35: Amateur discovery of a new southern symbiotic star
• Mapping H$\alpha$-Excess Candidate Point Sources in the Southern Hemisphere Using S-PLUS Data
• TCP J18224935-2408280: a symbiotic star identified during outburst
• Comprehensive analysis of a symbiotic candidate V503 Her