Cepheid investigations using the Kepler space telescope
Robert Szabó
(1)
,
L. Szabados
(1)
,
C.-C. Ngeow
(2)
,
R. Smolec
(3)
,
A. Derekas
(1)
,
P. A. Moskalik
(4)
,
J. Nuspl
(1)
,
H. Lehmann
(5)
,
G. Fzrész
(6)
,
Joanna Molenda-Zakowicz
(7)
,
S. T. Bryson
(8)
,
A. A. Henden
(9)
,
Donald W. Kurtz
(10)
,
Dennis Stello
(11)
,
J. M. Nemec
(12)
,
J. M. Benko
(1)
,
L. Berdnikov
(13)
,
H. Bruntt
(14, 15)
,
N. R. Evans
(16)
,
N. A. Gorynya
(17)
,
E. N. Pastukhova
(17)
,
R. J. Simcoe
(13)
,
J. E. Grindlay
(18)
,
E. J. Los
(18)
,
A. Doane
(18)
,
S. G. Laycock
(18)
,
D. J. Mink
(16)
,
G. Champine
(18)
,
A. Sliski
(18)
,
Gerald Handler
(3)
,
László L. Kiss
(1)
,
Zoltán Kolláth
(1)
,
J. Kovács
(19)
,
Jörgen Christensen-Dalsgaard
(20)
,
Hans Kjeldsen
(20)
,
Christine Allen
(21)
,
S. E. Thompson
(8)
,
Jeffrey E. van Cleve
(8)
1
Konkoly Observatory, Research Center for Astronomy and Earth Sciences
2 Graduate Institute of Astronomy
3 IfA - Institut für Astronomie, Universität Wien
4 CAMK - Centrum Astronomiczne im. M. Kopernika, Warszawa
5 Thüringer Landessternwarte, Tautenburg Observatory
6 Harvard-Smithsonian Center for Astrophysics
7 Astronomical Institute, University of Wroclaw
8 SETI Institute, NASA Ames Research Center, Moffett Field
9 AAVSO - American Association of Variable Star Observers
10 Jeremiah Horrocks Institute of Astrophysics, University of Central Lancashire
11 SIfA - Sydney Institute for Astronomy
12 Department of Physics and Astronomy, Camosun College
13 SSIA - Shternberg State Institute of Astronomy
14 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
15 Etoile
16 Smithsonian Astrophysical Observatory
17 INASAN - Institute of Astronomy of the Russian Academy of Sciences
18 Harvard College Observatory, Cambridge
19 Gothard Astrophysical Observatory
20 DASC - Danish AsteroSeismology Centre
21 Orbital Sciences Corporation, NASA Ames Research Center, Moffett Field
2 Graduate Institute of Astronomy
3 IfA - Institut für Astronomie, Universität Wien
4 CAMK - Centrum Astronomiczne im. M. Kopernika, Warszawa
5 Thüringer Landessternwarte, Tautenburg Observatory
6 Harvard-Smithsonian Center for Astrophysics
7 Astronomical Institute, University of Wroclaw
8 SETI Institute, NASA Ames Research Center, Moffett Field
9 AAVSO - American Association of Variable Star Observers
10 Jeremiah Horrocks Institute of Astrophysics, University of Central Lancashire
11 SIfA - Sydney Institute for Astronomy
12 Department of Physics and Astronomy, Camosun College
13 SSIA - Shternberg State Institute of Astronomy
14 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
15 Etoile
16 Smithsonian Astrophysical Observatory
17 INASAN - Institute of Astronomy of the Russian Academy of Sciences
18 Harvard College Observatory, Cambridge
19 Gothard Astrophysical Observatory
20 DASC - Danish AsteroSeismology Centre
21 Orbital Sciences Corporation, NASA Ames Research Center, Moffett Field
Résumé
We report results of initial work done on selected candidate Cepheids to be observed with the Kepler space telescope. Prior to the launch, 40 candidates were selected from previous surveys and data bases. The analysis of the first 322 d of Kepler photometry, and recent ground-based follow-up multicolour photometry and spectroscopy allowed us to confirm that one of these stars, V1154 Cyg (KIC 7548061), is indeed a 4.9-d Cepheid. Using the phase lag method, we show that this star pulsates in the fundamental mode. New radial velocity data are consistent with previous measurements, suggesting that a long-period binary component is unlikely. No evidence is seen in the ultraprecise, nearly uninterrupted Kepler photometry for non-radial or stochastically excited modes at the micromagnitude level. The other candidates are not Cepheids, but an interesting mix of possible spotted stars, eclipsing systems and flare stars.