Volume 601, May 2017
|Number of page(s)||8|
|Section||Stellar structure and evolution|
|Published online||04 May 2017|
Irradiated stars with convective envelopes
Astrophysics Group, Blackett Laboratory, Imperial College London, Prince Consort Road, London, SW7 2AZ, UK
Received: 4 November 2016
Accepted: 26 March 2017
The observed radii of M dwarfs in eclipsing binaries exceed predicted radii by ~5%. To investigate this anomaly, the structure of low-mass stars irradiated by a close companion is considered. Irradiation modifies the surface boundary conditions and thereby also the adiabatic constants of their outer convection zones. This changes the models’ radii and luminosities. For short-period M dwarf binaries with components of similar mass, radius inflation due to their mutual irradiation is found to be ≲0.4%. This is an order of magnitude too small to explain the observed anomaly. Although stronger irradiation results in a monotonically increasing radius, a saturation effect limits the inflation to ≲5%.
Key words: stars: atmospheres / binaries: close / stars: low-mass
© ESO, 2017
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.