Two evolved close binary stars: GALEX J015054.4+310745 and the central star of the planetary nebula Hen 2-84

Hillwig TC, Reindl N, Rotter HM, Rengstorf AW, Heber U, Irrgang A (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Monthly Notices of the Royal Astronomical Society Oxford University Press

Book Volume: 511

Pages Range: 2033-2039

Journal Issue: 2

DOI: 10.1093/mnras/stac226

Abstract

As part of a survey to find close binary systems among central stars of planetary nebula, we present two newly discovered binary systems. GALEX J015054.4+310745 is identified as the central star of the possible planetary nebula Fr 2-22. We find it to be a single-lined spectroscopic binary with an orbital period of 0.2554435(10) d. We support the previous identification of GALEX J015054.4+310745 as an sdB star and provide physical parameters for the star from spectral modelling. We identify its undetected companion as a likely He white dwarf. Based on this information, we find it unlikely that Fr 2-22 is a true planetary nebula. In addition, the central star of the true planetary nebula Hen 2-84 is found to be a photometric variable, likely due to the irradiation of a cool companion. The system has an orbital period of 0.485645(30) d. We discuss limits on binary parameters based on the available light-curve data. Hen 2-84 is a strongly shaped bipolar planetary nebula, which we now add to the growing list of axially or point-symmetric planetary nebulae with a close binary central star.

Authors with CRIS profile

Ulrich Heber Professur für Astronomie und Astrophysik Andreas Irrgang Dr.Karl-Remeis-Sternwarte Bamberg, Astronomisches Institut

Involved external institutions

Valparaiso University US United States (USA) (US) Universität Potsdam DE Germany (DE) Purdue University Northwest / Purdue University Calumet US United States (USA) (US)

How to cite

APA:

Hillwig, T.C., Reindl, N., Rotter, H.M., Rengstorf, A.W., Heber, U., & Irrgang, A. (2022). Two evolved close binary stars: GALEX J015054.4+310745 and the central star of the planetary nebula Hen 2-84. Monthly Notices of the Royal Astronomical Society, 511(2), 2033-2039. https://doi.org/10.1093/mnras/stac226

MLA:

Hillwig, Todd C., et al. "Two evolved close binary stars: GALEX J015054.4+310745 and the central star of the planetary nebula Hen 2-84." Monthly Notices of the Royal Astronomical Society 511.2 (2022): 2033-2039.

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