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Open Astronomy

formerly Baltic Astronomy

Editor-in-Chief: Barbuy, Beatriz

IMPACT FACTOR 2018: 0.350

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Volume 27, Issue 1


Spectral energy distributions and colours of hot subluminous stars

Ulrich Heber / Andreas Irrgang / Johannes Schaffenroth
Published Online: 2018-02-28 | DOI: https://doi.org/10.1515/astro-2018-0008


Photometric surveys at optical, ultraviolet, and infrared wavelengths provide ever-growing datasets as major surveys proceed. Colour-colour diagrams are useful tools to identify classes of star and provide large samples. However, combining all photometric measurements of a star into a spectral energy distribution will allow quantitative analyses to be carried out. We demonstrate how to construct and exploit spectral energy distributions and colours for sublumious B (sdB) stars. The aim is to identify cool companions to hot subdwarfs and to determine atmospheric parameters of apparently single sdB stars as well as composite spectrum sdB binaries.We analyse two sdB stars with high-quality photometric data which serve as our benchmarks, the apparently single sdB HD205805 and the sdB + K5 binary PG 0749+658, briefly present preliminary results for the sample of 142 sdB binaries with known orbits, and discuss future prospects from ongoing all-sky optical space- (Gaia) and ground-based (e.g. SkyMapper) as well as NIR surveys.

Keywords: stars: early type; subdwarfs; Techniques: potometric


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About the article

Received: 2017-11-22

Accepted: 2017-11-30

Published Online: 2018-02-28

Citation Information: Open Astronomy, Volume 27, Issue 1, Pages 35–43, ISSN (Online) 2543-6376, DOI: https://doi.org/10.1515/astro-2018-0008.

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© 2018, published by De Gruyter. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License. BY-NC-ND 4.0

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