V618 Sgr: Galactic eclipsing symbiotic nova detected in repeated outbursts
arXiv:2305.03537 · doi:10.1093/mnras/stad1434
Abstract
V618 Sgr was previously classified as an R CrB-type variable and later as a possible symbiotic star. Our study aims to analyse the nature of this target, which is currently undergoing significant brightening in properties similar to those of known symbiotic novae. We analyse literature information, photometric observations, and 35 new optical spectra. Our findings strongly suggest that V618 Sgr is an eclipsing symbiotic nova currently in outburst. Additionally, since the star has demonstrated at least two similar brightenings in the past, we propose that V618 Sgr could be the first known galactic symbiotic nova observed in repeated outbursts of this type and may host a relatively massive white dwarf.
6 pages, 6 figures, 1 table; accepted in MNRAS
References in corpus (13)
- Gaia Data Release 3: Summary of the content and survey properties
- Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
- The All-Sky Automated Survey for Supernovae (ASAS-SN) Light Curve Server v1.0
- VOSA: Virtual Observatory SED Analyzer. An application to the Collinder 69 open cluster
- Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G=18.5
- A census of symbiotic stars in the 2MASS, WISE and Gaia surveys
- A machine learning approach for identification and classification of symbiotic stars using 2MASS and WISE
- Discovery of five new Galactic symbiotic stars in the VPHAS+ survey
- Spectroscopic and photometric analysis of symbiotic candidates -- I. Ten candidates on classical symbiotic stars
- Hen 3-860: New southern eclipsing symbiotic star observed in the outburst
- The nature of the symbiotic candidate 2MASS J07363415+6538548 in the field of NGC 2403
- LMC S154: the first Magellanic symbiotic recurrent nova
- Symbiotic Novae