TY - JOUR
T1 - A survey for variable young stars with small telescopes
T2 - VI – Analysis of the outbursting Be stars NSW 284, gaia 19eyy, and VES 263
AU - Froebrich, Dirk
AU - Hillenbrand, Lynne A.
AU - Herbert, Carys
AU - De, Kishalay
AU - Eislöffel, Jochen
AU - Campbell-White, Justyn
AU - Kahar, Ruhee
AU - Hambsch, Franz-Josef
AU - Urtly, Thomas
AU - Popowicz, Adam
AU - Bernacki, Krzysztof
AU - Malcher, Andrzej
AU - Lasota, Slawomir
AU - Fiolka, Jerzy
AU - Jozwik-Wabik, Piotr
AU - Dubois, Franky
AU - Logie, Ludwig
AU - Rau, Steve
AU - Phillips, Mark
AU - Fleming, George
AU - Farfán, Rafael Gonzalez
AU - Soldán Alfaro, Francisco C.
AU - Nelson, Tim
AU - Futcher, Stephen R.L.
AU - Rolfe, Samantha M.
AU - Campbell, David A.
AU - Vale, Tony
AU - Devine, Pat
AU - Moździerski, Dawid
AU - Mikołajczyk, Przemysław J.
AU - Eggenstein, Heinz Bernd
AU - Rodriguez, Diego
AU - Walton, Ivan L.
AU - Vanaverbeke, Siegfried
AU - Merrikin, Barry
AU - Öğmen, Yenal
AU - Perez, Alex Escartin
AU - Aimar, Mario Morales
AU - Piehler, Georg
AU - Dover, Lord
AU - Patel, Aashini L.
AU - Miller, Niall
AU - Finch, Jack
AU - Hankins, Matt
AU - Moore, Anna M.
AU - Travouillon, Tony
AU - Szczepanski, Marek
N1 - Funding Information:
Our referee is acknowledged for a helpful report. We would like to thank all contributors of optical photometric data for their efforts towards the success of the HOYS project. We also thank the entire Gattini-IR team for access to infrared photometry of our sources. We acknowledge Tony Rodriguez for assistance in acquiring and reducing the Palomar/DoubleSpec data for NSW 284 that is reported here, and Adolfo Carvalho for assistance with DIBs feature identification in the HIRES spectra. JCW was funded by the European Union (ERC − European Research Council, 101039452). This work has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. All authors from Silesian University of Technology were responsible for data processing and automation of observations at SUTO observatories and were financed by grant BK-246/RAu-11/2022. Piotr Jóźwik-Wabik also acknowledges support from grant BKM-574/RAu-11/2022 and 32/014/SDU/10-22-20.
Publisher Copyright:
© 2023 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.
PY - 2023/4
Y1 - 2023/4
N2 - This paper is one in a series reporting results from small telescope observations of variable young stars. Here, we study the repeating outbursts of three likely Be stars based on long-term optical, near-infrared, and mid-infrared photometry for all three objects, along with follow-up spectra for two of the three. The sources are characterized as rare, truly regularly outbursting Be stars. We interpret the photometric data within a framework for modelling light-curve morphology, and find that the models correctly predict the burst shapes, including their larger amplitudes and later peaks towards longer wavelengths. We are thus able to infer the start and end times of mass loading into the circumstellar discs of these stars. The disc sizes are typically 3 – 6 times the areas of the central star. The disc temperatures are ∼40 per cent, and the disc luminosities are ∼10 per cent of those of the central Be star, respectively. The available spectroscopy is consistent with inside-out evolution of the disc. Higher excitation lines have larger velocity widths in their double-horned shaped emission profiles. Our observations and analysis support the decretion disc model for outbursting Be stars.
AB - This paper is one in a series reporting results from small telescope observations of variable young stars. Here, we study the repeating outbursts of three likely Be stars based on long-term optical, near-infrared, and mid-infrared photometry for all three objects, along with follow-up spectra for two of the three. The sources are characterized as rare, truly regularly outbursting Be stars. We interpret the photometric data within a framework for modelling light-curve morphology, and find that the models correctly predict the burst shapes, including their larger amplitudes and later peaks towards longer wavelengths. We are thus able to infer the start and end times of mass loading into the circumstellar discs of these stars. The disc sizes are typically 3 – 6 times the areas of the central star. The disc temperatures are ∼40 per cent, and the disc luminosities are ∼10 per cent of those of the central Be star, respectively. The available spectroscopy is consistent with inside-out evolution of the disc. Higher excitation lines have larger velocity widths in their double-horned shaped emission profiles. Our observations and analysis support the decretion disc model for outbursting Be stars.
KW - stars: early-type
KW - stars: emission-line, Be
KW - stars: mass-loss
KW - techniques: photometric
U2 - 10.1093/mnras/stad407
DO - 10.1093/mnras/stad407
M3 - Article
AN - SCOPUS:85159219642
SN - 0035-8711
VL - 520
SP - 5413
EP - 5432
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 4
ER -