Open AccessObservational limits on companions to G29-38
Author(s) -
S. J. Kleinman,
R. E. Nather,
D. E. Winget,
J. C. Clemens,
P. A. Bradley,
A. Kanaan,
J. L. Provencal,
C. F. Claver,
T. K. Watson,
K. Yanagida,
J. S. Dixson,
M. A. Wood,
D. J. Sullivan,
E. Meištas,
E. M. Leibowitz,
P. Moskalik,
S. Zoła,
G. Pajdosz,
J. Krzesiński,
J. E. Solheim,
A. Bruvold,
D. O’Donoghue,
Maurice Katz,
G. Vauclair,
N. Dolez,
M. Chevreton,
M. A. Barstow,
S. O. Kepler,
O. Giovannini,
Carl J. Hansen,
S. D. Kawaler
Publication year - 1994
Publication title -
astrophysical journal/the astrophysical journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.376
H-Index - 489
eISSN - 1538-4357
pISSN - 0004-637X
DOI - 10.1086/174965
Subject(s) - physics , astrophysics , radial velocity , variation (astronomy) , astronomy , stars
Recent interset in the variable (DAV) white dwarf G29-38 has been stirred by a tentative report of a radial velocity variation that may be due to an unseen companion. Earlier evidence for a brown dwarf in the system has come from an observed infrared excess in the star's spectrum. For asteroseismological reasons, we have accumulated more than five seasons of high-speed photometric data on the star. By measuring the phase of an isolated, stable frequency in the power spectrum, we show the measured variation is not due (at least in its entirety) to an orbital companion. Because any orbital radial velocity variation must result in a systematic phase variation, the data we present can be used to place stringent limits on the types of companions the system may contain.3938