The multiperiodic δ Scuti star 4 Canum Venaticorum: 1997 APT photometry
نویسندگان
چکیده
منابع مشابه
Photometry and asteroseismology of δ Scuti stars in Praesepe
We discuss observations and seismic analyses for three multi-periodic δ Scuti stars in the Praesepe cluster: BU, BN and BV Cnc. For two stars (BU and BN Cnc) we re-analyse published photoelectric photometry and show that using statistical weights results in a dramatic reduction in the noise level. We detect seven frequencies in BU Cnc and eight in BN Cnc, with three of the latter being previous...
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This paper reports the first clear detection of a detached dust shell surrounding the prototypical J-type carbon star Y CVn in 90 m and 160 m maps taken with the ISO/ISOPHOT1. The projected inner radius of the shell is 180–190, corresponding to (6.4–7.1) 1017 cm at a distance of 250 pc. The shell thickness is obtained to be (2–5) 1017 cm. The mass-loss rate at the formation of the shell is esti...
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We report the discovery of photometric oscillations in the host star of the exoplanet WASP-33 b (HD 15082). The data were obtained in the R band in both transit and out-of-transit phases from the 0.3-m telescope and the Montcabrer Observatory and the 0.8-m telescope at the Montsec Astronomical Observatory. Proper fitting and subsequent removal of the transit signal reveals stellar photometric v...
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Four of the most active RS CVn stars (V711 Tau, II Peg, Gem, and UX Ari) have been observed for a total of 3Ms with the Extreme Ultraviolet Explorer satellite (EUVE) between 1992 and 2000 January. Flaring and quiescent states of extreme ultraviolet spectra ( 70–740) and light curves ( 75–175) have been analyzed to provide emission measure distributions (EMD) for these systems in the range logTe...
متن کاملThe chromosphere of II Pegasi: multi-line modelling of an RS Canum Venaticorum star
We present the first simultaneous multi-line fitting of a semi-empirical atmospheric model with a chromosphere and transition region to the H I and Ca II spectra of an RS CVn star (II Peg). The static component of the Hα emission core, the line profile of Hβ, the apparent absence of Hγ and Hδ, and the emission core profiles of Ca II K and two of the Ca II IR3 lines are all approximately fitted ...
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ژورنال
عنوان ژورنال: Astronomy and Astrophysics Supplement Series
سال: 1999
ISSN: 0365-0138,1286-4846
DOI: 10.1051/aas:1999187