2023MNRAS.520.5413F

Query : 2023MNRAS.520.5413F

2023MNRAS.520.5413F - Mon. Not. R. Astron. Soc., 520, 5413-5432 (2023/April-3)

A survey for variable young stars with small telescopes: VI - Analysis of the outbursting Be stars NSW 284, gaia 19eyy, and VES 263.

FROEBRICH D., HILLENBRAND L.A., HERBERT C., DE K., EISLOFFEL J., CAMPBELL-WHITE J., KAHAR R., HAMBSCH F.-J., URTLY T., POPOWICZ A., BERNACKI K., MALCHER A., LASOTA S., FIOLKA J., JOZWIK-WABIK P., DUBOIS F., LOGIE L., RAU S., PHILLIPS M., FLEMING G., FARFAN R.G., SOLDAN ALFARO F.C., NELSON T., FUTCHER S.R.L., ROLFE S.M., CAMPBELL D.A., VALE T., DEVINE P., MOZDZIERSKI D., MIKOLAJCZYK P.J., EGGENSTEIN H.-B., RODRIGUEZ D., WALTON I.L., VANAVERBEKE S., MERRIKIN B., OGMEN Y., ESCARTIN PEREZ A., MORALES AIMAR M., PIEHLER G., DOVER L., PATEL A.L., MILLER N., FINCH J., HANKINS M., MOORE A.M., TRAVOUILLON T. and SZCZEPANSKI M.

Abstract (from CDS):

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.

Abstract Copyright: © 2023 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): techniques: photometric - stars: early-type - stars: emission-line, Be - stars: mass-loss

Simbad objects: 10

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Number of rows : 10
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 V* VY Tau Or* 04 39 17.4194063616 +22 47 53.348542332     9.00     M0Ve 205 0
2 NAME Puppis reg 07 40 -28.0           ~ 108 0
3 Gaia 19eyy ev 08 30 42.50 -41 33 42.6   14.29 13.53   13.05 ~ 2 0
4 Cl* Trumpler 14 Y 340 * 10 44 11.7412692528 -59 44 26.702045448 15.163 15.305 14.557   13.175 ~ 8 0
5 ZTF J203148.84+403800.0 LP* 20 31 48.8484352416 +40 38 00.063295692   14.92 13.10 12.07 11.06 B1II 20 0
6 Ass Cyg OB 2 As* 20 33.2 +41 19           ~ 1023 0
7 2MASS J20541514+4407532 Y*O 20 54 15.1482669648 +44 07 53.183502372           ~ 3 0
8 ASASSN-V J210822.32+584613.4 * 21 08 22.4103964167 +58 46 13.452220902           ~ 1 0
9 ATO J324.6658+57.1464 Or* 21 38 39.8100828408 +57 08 47.109992028   15.50 14.76   14.29 ~ 7 0
10 IC 1396 OpC 21 38 51.4 +57 31 52           ~ 523 1

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