Gaia20bdk – New FU Ori-type star in the Sh 2-301 star-forming region

Context. We analyse multi-colour photometric and spectroscopic observations of the young stellar object (YSO) Gaia20bdk. Aims. We aim to investigate the exact nature of the eruptive phenomenon that the star has been undergoing since 2018. Methods. We used public-domain archival photometry to characterise the quiescent phase and to establish the major physical parameters of the progenitor. We used our own optical and infrared (IR) photometry and spectroscopy, along with data from the public domain, to study the outburst. Results. Gaia20bdk is a member of the Sharpless 2-301 star-forming region, at a distance of 3.3 kpc. The progenitor is a rather massive 2.7 ± 0.5 M ⊙ , G7-type Class I young star, with an effective temperature of 5300 −300 +500 K and bolometric luminosity of 11 ± 2 L ⊙ . The optical and IR photometric and spectroscopic data obtained during the outburst reveal a variety of signatures commonly found in classical FU Ori-type stars (FUors). Our disc modelling gives a bolometric luminosity of 100 − 200 L ⊙ and mass accretion rate of 1 − 2 × 10 −5 M ⊙ yr −1 , also confirming the object’s FUor classification. Further monitoring is necessary to track the light changes, accretion rate, and spectral variations, as well as to understand the mechanisms behind the disc flickering.

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Publication Details

Journal
Astronomy and Astrophysics
Published
2025-03-01
DOI
https://doi.org/10.1051/0004-6361/202451061
Primary Topic
Stellar, planetary, and galactic studies
Type
article
Field-Weighted Citation Impact
0.00

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article

Gaia20bdk – New FU Ori-type star in the Sh 2-301 star-forming region

M. Kun, Ł. Wyrzykowski, Ramotholo Sefako, Máté Szilágyi et al.
Astronomy and Astrophysics
Stellar, planetary, and galactic studies
article

Gaia20bdk – New FU Ori-type star in the Sh 2-301 star-forming region

M. Kun, Ł. Wyrzykowski, Ramotholo Sefako, Máté Szilágyi, M. Gromadzki, P. W. Lucas, B. Cseh, Paweł Zieliński, J. Krzesiński, G. Marton, Á. Sódor, T. Giannini, Csilla Kalup, Á. Kóspál, B. Zakrzewski, József Vinkó, Z. Nagy, Zsófia Marianna Szabó, L. Kriskovics, D. A. H. Buckley, W. Ogłoza, H. L. Worters, M. Siwak, Ágoston Horti-Dávid, Stephen B Potter, Fernando Cruz-Sáenz de Miera, András Pál, Eleonora Fiorellino, Róbert Szakáts, P. Ábrahám, András Péter Joó
article en

Abstract

Context. We analyse multi-colour photometric and spectroscopic observations of the young stellar object (YSO) Gaia20bdk. Aims. We aim to investigate the exact nature of the eruptive phenomenon that the star has been undergoing since 2018. Methods. We used public-domain archival photometry to characterise the quiescent phase and to establish the major physical parameters of the progenitor. We used our own optical and infrared (IR) photometry and spectroscopy, along with data from the public domain, to study the outburst. Results. Gaia20bdk is a member of the Sharpless 2-301 star-forming region, at a distance of 3.3 kpc. The progenitor is a rather massive 2.7 ± 0.5 M ⊙ , G7-type Class I young star, with an effective temperature of 5300 −300 +500 K and bolometric luminosity of 11 ± 2 L ⊙ . The optical and IR photometric and spectroscopic data obtained during the outburst reveal a variety of signatures commonly found in classical FU Ori-type stars (FUors). Our disc modelling gives a bolometric luminosity of 100 − 200 L ⊙ and mass accretion rate of 1 − 2 × 10 −5 M ⊙ yr −1 , also confirming the object’s FUor classification. Further monitoring is necessary to track the light changes, accretion rate, and spectral variations, as well as to understand the mechanisms behind the disc flickering.

Astronomy and AstrophysicsVol. 695
Eötvös Loránd University (HU), Jagiellonian University (PL), Centre National de la Recherche Scientifique (FR), University of Vienna (AT), University of Hertfordshire (GB), University of Cape Town (ZA), Universidad de La Laguna (ES), University of St Andrews (GB), University of Johannesburg (ZA), University of the Free State (ZA), Astronomical Observatory of Rome (IT), Konkoly Observatory (HU), Nicolaus Copernicus University (PL), Max Planck Institute for Astronomy (DE), South African Radio Astronomy Observatory (ZA), Scottish Universities Physics Alliance (GB), Instituto de Astrofísica de Canarias (ES), Astronomical Observatory (RS), Max Planck Institute for Radio Astronomy (DE), Institut de Recherche en Astrophysique et Planétologie (FR), University of Warsaw (PL), National Institute for Astrophysics (IT)
National Science Foundation, National Aeronautics and Space Administration, California Institute of Technology, Aarhus Universitet, International Max Planck Research School for Environmental, Cellular and Molecular Microbiology, University of St Andrews, European Commission, Hungarian Scientific Research Fund, Magyar Tudományos Akadémia, Ministerstwo Edukacji i Nauki, Universitetet i Oslo, Háskóli Íslands, Turun Yliopisto, Stockholms Universitet, Nemzeti Kutatási Fejlesztési és Innovációs Hivatal, International Max Planck Research School for Advanced Methods in Process and Systems Engineering, Horizon 2020 Framework Programme, National Research, Development and Innovation Office
Openalex Percentile: Top 97%
Stellar, planetary, and galactic studies
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