Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...300..783l&link_type=abstract
Astronomy and Astrophysics, v.300, p.783
Astronomy and Astrophysics
Astrophysics
12
Stars: Early-Type, Stars: Individual: {Gamma} Umi, {Gamma} Crb, Stars: Oscillations, {Delta} Sct
Scientific paper
Series of spectrograms and a limited number of photometric measurements of selected early-type stars have been used to search in the measured radial velocities and light curves for stellar pulsations with timescales of a few hours. For these stars, located in the HR diagram between the β Cep and the δ Scu stars and designed sometimes as Maia variables, the presence of pulsations is claimed to be a common property. In our sample we found no hints for a general existence of such pulsations. RV-variations with the expected short-term scale could be observed for only two of the program stars, γ UMi and γ CrB. The variations are highly irregular in amplitude and frequency. On the other hand, for both stars a typical mean timescale of the RV-variation of about 2.4hr has been found which gives some hints to possibly common physical causes of short-term variations of stars in this part of the HR diagram. The RV-variation of γ CrB in the years 1992/93 could be attributed to a rotational splitting of nonradial pulsations.
Hildebrandt Gerald
Klose Sylvio
Lehmann Holger
Panov Kyril P.
Reimann Hans-Georg
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