Article (Scientific journals)
Multisite Observations of delta Scuti Stars 7 Aql and 8 Aql (a New delta Scuti Variable): The Twelfth STEPHI Campaign in 2003
Fox Machado, L.; Michel, Eric; Pérez Hernández, F. et al.
2007In Astronomical Journal, 134, p. 860-866
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Keywords :
Stars: Variables: delta Scuti; stars: individual (HD 174532); stars: individual (HD 174589); Stars: Oscillations; Techniques: Photometric
Abstract :
[en] We present an analysis of the pulsation behavior of the delta Scuti stars 7 Aql (HD 174532) and 8 Aql (HD 174589), a new variable star, observed in the framework of the STEPHI XII campaign during 2003 June and July; 183 hr of high-precision photometry were acquired by using four-channel photometers at three sites on three continents during 21 days. The light curves and amplitude spectra were obtained following a classical scheme of multichannel photometry. Observations in different filters were also obtained and analyzed. Six and three frequencies have been unambiguously detected above a 99% confidence level in the range 190-300 muHz and 100-145 muHz in 7 Aql and 8 Aql, respectively. A comparison of observed and theoretical frequencies shows that 7 Aql and 8 Aql may oscillate with p-modes of low radial orders, typical among delta Scuti stars. In terms of radial oscillations the range of 8 Aql goes from n=1 to 3, while for 7 Aql the range spans from n=4 to 7. Nonradial oscillations have to be present in both stars as well. The expected range of excited modes according to a nonadiabatic analysis goes from n=1 to 6 in both stars.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Fox Machado, L.;  Observatorio Astronómico Nacional, Instituto de Astronomía, Universidad Nacional Autónoma de México, A.P. 877, Ensenada, BC 22860, Mexico.
Michel, Eric
Pérez Hernández, F.;  Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife, Spain. ; Departamento de Astrofísica, Universidad de La Laguna, E-38205 La Laguna, Tenerife, Spain.
Peña, J. H.;  Instituto de Astronomía, Universidad Nacional Autónoma de México, A.P. 70-264, México, DF 04510, Mexico.
Li, Z. P.;  Beijing Observatory, Chinese Academy of Sciences, Beijing, China.
Chevreton, M.;  Observatoire de Paris, LESIA, UMR 8109, F-92195 Meudon, France.
Belmonte, J. A.;  Instituto de Astrofísica de Canarias, E-38205 La Laguna, Tenerife, Spain.
Álvarez, M.;  Observatorio Astronómico Nacional, Instituto de Astronomía, Universidad Nacional Autónoma de México, A.P. 877, Ensenada, BC 22860, Mexico.
Parrao, L.;  Instituto de Astronomía, Universidad Nacional Autónoma de México, A.P. 70-264, México, DF 04510, Mexico.
Dupret, Marc-Antoine ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique
Pau, S.;  Observatoire de Paris, LESIA, UMR 8109, F-92195 Meudon, France.
Fernandez, A.;  Observatoire de Paris, LESIA, UMR 8109, F-92195 Meudon, France.
Michel, J.
Michel, R.
Pani, A.;  Observatorio Astronómico Nacional, Instituto de Astronomía, Universidad Nacional Autónoma de México, A.P. 877, Ensenada, BC 22860, Mexico.
More authors (5 more) Less
Language :
English
Title :
Multisite Observations of delta Scuti Stars 7 Aql and 8 Aql (a New delta Scuti Variable): The Twelfth STEPHI Campaign in 2003
Publication date :
01 August 2007
Journal title :
Astronomical Journal
ISSN :
0004-6256
eISSN :
1538-3881
Publisher :
Univ Chicago Press, Chicago, United States - Illinois
Volume :
134
Pages :
860-866
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
http://de.arxiv.org/abs/0706.0576
Available on ORBi :
since 10 November 2010

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