HD 49933 [SEP] constellation
HD 49933
HD 49933 (HR 2530) is a Sun-like star in the equatorial constellation of Monoceros, the unicorn. The HD designation indicates the identifier of the star found in the Henry Draper catalogue. At an apparent magnitude of 5.8, this star can just be seen with the naked eye under suitably dark conditions. Based upon parallax measurements from the Hipparcos mission, the distance to HD 49933 is about with a 1% margin of error. It has an 11.3 magnitude common proper motion companion at an angular separation
location of the transition zones. These deviations were predicted by theory and were first observed in the Sun. Thanks to CoRoT they were also detected in the solar-like star HD 49933 and also in the red giant star HD 181907. In both cases the location of the helium ionization zone could be accurately derived.
2. Amplitudes and line widths in solar-like oscillation spectra: One of the major successes of the CoRoT space mission has definitely been the detection of solar-like oscillations in stars slightly hotter than the