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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 198350.0, MPI für Astronomie / Publikationen_mpia
A photometric monitoring of bright
high-amplitude d Scuti stars. II. Period updates
for seven stars
Authors:Derekas, A.; Kiss, L. L.; Székely, P.; Alfaro, E. J.; Csák, B.; Mészáros, Sz.; Rodríguez, E.; Rolland, A.; Sárneczky, K.; Szabó, Gy. M.; Szatmáry, K.; Váradi, M.; Kiss, Cs.
Date of Publication (YYYY-MM-DD):2003
Title of Journal:Astronomy and Astrophysics
Journal Abbrev.:Astronomy and Astrophysics
Volume:402
Start Page:733
End Page:743
Review Status:not specified
Audience:Not Specified
Abstract / Description:We present new photometric data for seven
high-amplitude delta Scuti stars. The
observations were acquired between 1996 and 2002,
mostly in the Johnson photometric system. For one
star (GW UMa), our observations are the first
since the discovery of its pulsational nature
from the Hipparcos data. The primary goal of this
project was to update our knowledge on the period
variations of the target stars. For this, we have
collected all available photometric observations
from the literature and constructed decades-long
O-C diagrams of the stars. This traditional
method is useful because of the single-periodic
nature of the light variations. Text-book
examples of slow period evolution (XX Cyg, DY
Her, DY Peg) and cyclic period changes due to
light-time effect (LITE) in a binary system (SZ
Lyn) are updated with the new observations. For
YZ Boo, we find a period decrease instead of
increase. The previously suggested LITE-solution
of BE Lyn (Kiss & Szatmáry \cite{Kiss95}) is not
supported with the new O-C diagram. Instead of
that, we suspect the presence of transient light
curve shape variations mimicking small period
changes.
Free Keywords:stars: variables: general; stars: oscillations; delta Sct
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
External Affiliations:Astronomical Observatory, University of Szeged,
Dóm tér 9, Szeged 6720, Hungary; School of
Physics, University of Sydney 2006, Australia;
Guest observer at Konkoly Observatory, Hungary),
AB(School of Physics, University of Sydney 2006,
Australia; Guest observer at Konkoly Observatory,
Hungary), AC(Department of Experimental Physics
and Astronomical Observatory, University of
Szeged, Dóm tér 9, Szeged 6720, Hungary),
AD(Instituto de Astrofísica de Andalucía, CSIC,
PO Box 3004, 18080 Granada, Spain),
AE(Department of Experimental Physics and
Astronomical Observatory, University of Szeged,
Dóm tér 9, Szeged 6720, Hungary), AH(Department
of Experimental Physics and Astronomical
Observatory, University of Szeged, Dóm tér 9,
Szeged 6720, Hungary), AI(Instituto de
Astrofísica de Andalucía, CSIC, PO Box 3004,
18080 Granada, Spain), AJ(Instituto! de
Astrofísica de Andalucía, CSIC, PO Box 3004,
18080 Granada, Spain), AK(Astronomical
Observatory, Szeged, Hungary; Guest observer at
Konkoly Observatory, Hungary), AL(Department of
Experimental Physics and Astronomical
Observatory, University of Szeged, Dóm tér 9,
Szeged 6720, Hungary), AK(Department of
Experimental Physics and Astronomical
Observatory, University of Szeged, Dóm tér 9,
Szeged 6720, Hungary), AM(Department of
Experimental Physics and Astronomical
Observatory, University of Szeged, Dóm tér 9,
Szeged 6720, Hungary), AN(Konkoly Observatory of
the Hungarian Academy of Sciences, PO Box 67,
1525 Budapest, Hungary)
Identifiers:URL:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bi... [ID No:1]
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