GDOR y Doradus stars

- y Doradus stars were officially added to the GCVS in March 2000 (The 75"' Name-List of Variable Stars, 1BVS 4870). They are described as early type F dwarfs showing (multiple) periods from several tenths of a day to slightly in excess of one day. Amplitudes usually do not exceed 0".'l. Presumably low degree g-mode non-radial pulsators.

8 Scuti stars, SX Phoenicis stars, and y Doradus stars are three kinds of pulsating variable stars of similar spectral type and luminosity class. All three types are found near the main sequence in, or near, the Cepheid instability strip in the HR diagram.

8 Scuti stars comprise the largest class of these three types of stars and are subsequently the best studied. SX Phoenicis stars have similar periods but typically have much higher photometric amplitudes (O^-OTS). y Doradus stars are the most recently identified of the three types of variable stars just mentioned. They are typically early-F stars on, or just above, the main sequence in the HR diagram, and they are at or beyond the cool edge of the Cepheid instability strip. They exhibit photometric variability as large as 0T1 in V on a time-scale of 0.5-3 days.

Observation

"fa Bright stars

Mixed amplitudes Mixed periods <S> CCD or PEP

0 0

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