Left: for coronal sources, the ratio of X-ray luminosity (L_X) and bolometric luminosity (L_bol) is correlated with the rotational period. The figure compares the limits on TYC 4144-329-1 and TYC 4144-329-2 with other stellar samples; see Section 4.6 for a description of the samples. Error bars are omitted for samples with more than three objects for clarity. Since the inclination of TYC 4144-329-1 and TYC 4144-329-2 is unknown, there is only an upper limit on the rotation period. TYC 4144-329-1 is undetected in X-rays; the area marked in the plot assumes the least restrictive coronal temperature (0.3 keV) discussed in the text. For hotter coronae, the limit on the X-ray luminosity is lower. Right: same as the left panel but for the Rossby number.

An interactive version of this figure is available in the online article.

An interactive version of this figure is available.

An interactive version of this figure is available in the online journal.