They have found a relationship between radius, luminosity and surface brightness for galaxies in each of the clusters. Moreover, it seems that there is a dependence of the zero point of the relation with environment. This relationship implies that there is not a universal luminosity profile for ...
We have found a relationship between radius, luminosity, and surface brightness for galaxies in each of the clusters. A dependence of the zero point of the relation with the local projected density of galaxies is likewise found: r e 蟻 proj 0.14 L 0.445 I e 0.413 . This relationship ...
A change in the stellar radius due to strong and variable magnetic fields during activity cycles likely plays a role in explaining the anomalous brightness and luminosity of our three targets. At least for IL Hya, a radius change of about 9% is suggested from m_bol and T_eff, and is ...
We briefly discuss the potential of the near-infrared versions of the Barnes-Evans technique to set a very accurate (0.02mag) zero point to Cepheid period-luminosity relations and thus make a very important contribution to the absolute calibration of the extragalactic distance scale....