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|Title:||Kepler observations of A-F pre-main-sequence stars in Upper Scorpius: discovery of six new δ Scuti and one γ Doradus stars||Authors:||RIPEPI, Vincenzo
|Issue Date:||2015||Journal:||MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY||Number:||454||Issue:||3||First Page:||2606||Abstract:||We present light curves and periodograms for 27 stars in the young Upper Scorpius association (age = 11 ± 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 δ Scuti variables and one γ Doradus star. These are most likely PMS stars or else very close to the zero-age main sequence. Four of the δ 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 δ 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.||Acknowledgments:||We thank our anonymous referees for their valuable comments. LAB thanks the SAAO and National Research Foundation of South Africa for financial support. This work made use of pyke (Still Barclay 2012 ), a software package for the reduction and analysis of Kepler data. This open-source software project is developed and distributed by the NASA Kepler Guest Observer Office. This research has made use of the SIMBAD data base and VizieR catalogue access tool, operated at CDS, Strasbourg, France. We gratefully acknowledge the Kepler team and the Guest Observer Office whose outstanding efforts have made these results possible. This paper includes data collected by the Kepler mission. Funding for the Kepler mission is provided by the NASA Science Mission directorate. All of the data presented in this paper were obtained from the Mikulski Archive for Space Telescopes (MAST). STScI is operated by the Association of Universities for Research in Astronomy, Inc, under NASA contract NAS5-26555. Support for MAST for non- HST data is provided by the NASA Office of Space Science via grant NNX09AF08G and by other grants and contracts.||URI:||http://hdl.handle.net/20.500.12386/23519||URL:||https://academic.oup.com/mnras/article/454/3/2606/1209979||ISSN:||0035-8711||DOI:||10.1093/mnras/stv2221||Bibcode ADS:||2015MNRAS.454.2606R||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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