Open AccessOn the ephemeris of the pulsating hydrogen-deficient star V652 Her
Author(s) -
D. Kilkenny,
A. E. Lynas-Gray,
G. Roberts
Publication year - 1996
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1093/mnras/283.4.1349
Subject(s) - ephemeris , physics , maxima , star (game theory) , quartic function , astrophysics , light curve , astronomy , maxima and minima , mathematical analysis , pure mathematics , mathematics , art history , art , satellite , performance art
Some new timings of maxima of the pulsating hydrogen-deficient star V652 Her (BD + 13° 3224) obtained during 1991–95 are reported. The data show that the ephemeris for times of maxima can no longer be represented by a cubic polynomial, and that a quartic term is necessary. The star could have brightened by up to 0.008 mag over the last decade, although this is not firmly established (the apparent ...
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