Spectroscopic Study of the Circularly Polarised Radio Source TYC 2834-1385-1: An Active Binary
Abstract
Close binaries with active chromospheres have recently been shown to emit circularly polarised radio emission at low frequencies, motivating detailed studies of their orbital properties. We present high-resolution (R=85,000) optical spectroscopy of TYC 2834-1385-1, a previously unclassified radio source, obtained with the HERMES spectrograph on the Mercator Telescope. We identify the source as a double-lined spectroscopic binary and measure radial velocities from both metallic absorption and Ca II emission lines. We find an orbital period of P=3.601±0.002 days and nearly equal radial-velocity semi-amplitudes for the two components. The system exhibits strong Ca II H and K emission, which is consistent with a BY Dra-type binary containing two similar late-G/early-K main-sequence stars, with a preliminary classification of K0V. This represents one of the first spectroscopic confirmations of a chromospherically active binary following its identification in a low-frequency radio survey.
Versions
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BibTeX
@misc{bleeker2026spectroscopic,
title = {{Spectroscopic Study of the Circularly Polarised Radio Source TYC 2834-1385-1: An Active Binary}},
author = {Tamara A. S. Bleeker and Alexander Hoogerbrug and Elise Koo and Rudy Wijnands and Joseph R. Callingham},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.26849},
eprint = {2609.26849},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.26849},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Spectroscopic Study of the Circularly Polarised Radio Source TYC 2834-1385-1: An Active Binary
AU - Tamara A. S. Bleeker
AU - Alexander Hoogerbrug
AU - Elise Koo
AU - Rudy Wijnands
AU - Joseph R. Callingham
PY - 2026
DA - 2026/09/22
PB - arXiv
DO - 10.48550/arxiv.2609.26849
UR - https://arxiv.org/abs/2609.26849
AB - Close binaries with active chromospheres have recently been shown to emit circularly polarised radio emission at low frequencies, motivating detailed studies of their orbital properties. We present high-resolution (R=85,000) optical spectroscopy of TYC 2834-1385-1, a previously unclassified radio source, obtained with the HERMES spectrograph on the Mercator Telescope. We identify the source as a double-lined spectroscopic binary and measure radial velocities from both metallic absorption and Ca II emission lines. We find an orbital period of P=3.601±0.002 days and nearly equal radial-velocity semi-amplitudes for the two components. The system exhibits strong Ca II H and K emission, which is consistent with a BY Dra-type binary containing two similar late-G/early-K main-sequence stars, with a preliminary classification of K0V. This represents one of the first spectroscopic confirmations of a chromospherically active binary following its identification in a low-frequency radio survey.
ER -