Surface temperature gradient of fast-rotating B9.5-A0 star Kelt-9
Abstract
We present results of the estimates of the surface temperature gradient of fast-rotating B 9.5-A0 star KELT-9 based on TESS observations of Kelt-9 b transits and methods developed for late-type stars in order to determine the spots physical properties. It was found that the temperature of the equatorial region of KELT-9 is lower than at the pole by a value of 950 K with an error of 300 K. This value was compared with the results of detailed self-consistent analysis performed by other authors. A brief overview of the completed studies of the star and planet of the KELT-9 system is given. KELT-9 system is of interest from the point of view of its inclusion in core observation program of the Spektr-UF project — The World Space Observatory (WCO-UV) in terms of observations of exoplanets.
- Publication:
-
INASAN Science Reports
- Pub Date:
- November 2020
- DOI:
- 10.26087/INASAN.2020.5.5.004
- Bibcode:
- 2020INASR...5..243S
- Keywords:
-
- stars;
- activity;
- magnetic fields;
- photometry;
- light curves;
- spots;
- variability