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20 April 2024 |
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Article overview
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Kepler observations of A-F pre-main sequence stars in Upper Scorpius: Discovery of six new $delta$~Scuti and one $gamma$~Doradus stars | | V. Ripepi
; L. Balona
; G. Catanzaro
; M. Marconi
; F. Palla
; M. Giarrusso
; | | Date: |
23 Sep 2015 | | Abstract: | We present light curves and periodograms for 27 stars in the young Upper
Scorpius association (age=$11 pm 1$,Myr) obtained with the Kepler spacecraft.
This association is only the second stellar grouping to host several pulsating
pre-main sequence (PMS) stars which have been observed from space. From an
analysis of the periodograms, we identify six $delta$~Scuti variables and one
$gamma$~Doradus star. These are most likely PMS stars or else very close to
the zero-age main sequence. Four of the $delta$~Scuti variables were observed
in short-cadence mode, which allows us to resolve the entire frequency
spectrum. For these four stars, we are able to infer some qualitative
information concerning their ages. For the remaining two $delta$~Scuti stars,
only long-cadence data are available, which means that some of the frequencies
are likely to be aliases. One of the stars appears to be a rotational variable
in a hierarchical triple system. This is a particularly important object, as it
allows the possibility of an accurate mass determination when radial velocity
observations become available. We also report on new high-resolution echelle
spectra obtained for some of the stars of our sample. | | Source: | arXiv, 1509.6943 | | Services: | Forum | Review | PDF | Favorites | |
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