Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 411, Issue 2, Pages 1167-1176Publisher
WILEY-BLACKWELL
DOI: 10.1111/j.1365-2966.2010.17749.x
Keywords
stars: early-type; stars: fundamental parameters; stars: oscillations
Categories
Funding
- Italian ESS project [ASI/INAF I/015/07/0, WP 03170]
- European Helio- and Asteroseismology Network (HELAS)
- European Commission
- NASA's Science Mission Directorate
- National Science Foundation
- National Office for Reseach and Technology through the Hungarian Space Office [URK09350]
- Hungarian Academy of Sciences
- FCT-Portugal [PTDC/CTE-AST/098754/2008]
- NASA
- STFC [PP/F000057/1, PP/D000955/1, ST/J000035/1, ST/G002355/1] Funding Source: UKRI
- Science and Technology Facilities Council [PP/D000955/1, PP/F000057/1, ST/J000035/1, ST/G002355/1] Funding Source: researchfish
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We report spectroscopic observations for 19 delta Sct candidates observed by the Kepler satellite both in long and short cadence mode. For all these stars, by using spectral synthesis, we derive the effective temperature, the surface gravity and the projected rotational velocity. An equivalent spectral-type classification has been also performed for all stars in the sample. These determinations are fundamental for modelling the frequency spectra that will be extracted from the Kepler data for asteroseismic inference. For all the 19 stars, we also present periodograms obtained from Kepler data. We find that all stars show peaks in both low- (gamma Dor; g-mode) and high-frequency (delta Sct; p-mode) regions. Using the amplitudes and considering 5 cycles d-1 as a boundary frequency, we classified three stars as pure gamma Dor, four as gamma Dor-delta hybrid Sct, five as delta Sct-gamma Dor hybrid and six as pure delta Sct. The only exception is the star KIC 05296877, which we suggest could be a binary.
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