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oai:docta.ucm.es:20.500.14352/450522023-08-26T16:11:27Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense author Caballero, J. A. author Montes Gutiérrez, David author Klutsch, A. author Genebriera, J. author Miret, F. X. author Tobal, T. author Cairol, J. author Pedraz, S. 2023-06-20T04:13:00Z 2023-06-20T04:13:00Z 2010-09 0004-6361 10.1051/0004-6361/201014419 https://hdl.handle.net/20.500.14352/45052 http://dx.doi.org/10.1051/0004-6361/201014419 http://www.aanda.org/ Aims. We investigated in detail the system WDS 19312+3607, whose primary is an active M4.5Ve star previously inferred to be young (τ ~ 300–500 Ma) based on its high X-ray luminosity. Methods. We collected intermediate- and low-resolution optical spectra taken with 2 m-class telescopes, photometric data from the B to 8 μm bands, and data for eleven astrometric epochs with a time baseline of over 56 years for the two components in the system, G 125–15 and G 125–14. Results. We derived the M4.5V spectral types of both stars, confirmed their common proper motion, estimated their heliocentric distance and projected physical separation, determined their Galactocentric space velocities, and deduced a most-probable age of older than 600 Ma. We discovered that the primary, G 125–15, is an inflated, double-lined, spectroscopic binary with a short period of photometric variability of 1.6 d, which we associated with orbital synchronisation. The observed X-ray and Hα emissions, photometric variability, and abnormal radius and effective temperature of G 125–15 AB are indicative of strong magnetic activity, possibly because of the rapid rotation. In addition, the estimated projected physical separation between G 125–15 AB and G 125–14 of about 1200 AU ensures that WDS 19312+3607 is one of the widest systems with intermediate M-type primaries. Conclusions. G 125–15 AB is a nearby (d ≈ 26 pc), bright (J ≈ 9.6 mag), active spectroscopic binary with a single proper-motion companion of the same spectral type at a wide separation. They are thus ideal targets for specific follow-ups to investigate wide and close multiplicity or stellar expansion and surface cooling because of the lower convective efficiency. eng The magnetically-active, low-mass, triple system WDS 19312+3607 (Research Note) journal article URL https://docta.ucm.es/bitstreams/8d6374ac-b8f1-46b3-a52e-119bac6478c9/download File MD5 b7215b66cc0fc0a6cc5c5640805e4653 157365 application/pdf davidmontes15libre.pdf