Results 51 to 60 of about 1,181,220 (330)

Dwarf nova EZ Lyncis second visit to instability strip [PDF]

Publications of the Astronomical Society of Japan, 2014
Abstract The analysis of 14 periodograms of EZ Lyn for data spaced over 565 d in 2012–2014 (2–3.5 yr after the 2010 outburst) yielded the existence of a stable signal around 100 cycles/day (c/d) and three signals around 310 c/d, 338 c/d, and 368 c/d (the corresponding periods are 864 s, 279 s, 256 s, and 235 s).
Pavlenko E., Kato T., Sosnovskij A., Andreev M., Ohshima T., Sklyanov A., Bikmaev I., Galeev A.   +7 more
openaire   +4 more sources

DISCOVERY OF TWO LITHIUM CEPHEIDS IN THE GALAXY

Odessa Astronomical Publications, 2017
We report about the discovery of two lithium Cepheids in the Galaxy, based on observations made with the echelle spectrograph of the Apache Point Observatory. We have used high- resolution, high signal-to-noise spectra to determine abundances of chemical
V. V. Kovtyukh, G. Wallerstein, S. M. Andrievsky   +2 more
doaj   +1 more source

HST Spectra of GW Librae: A Hot Pulsating White Dwarf in a Cataclysmic Variable [PDF]

, 2002
We have obtained Hubble Space Telescope UV spectra of the white dwarf in GW Lib, the only known non-radially pulsating white dwarf in a cataclysmic variable, and the first known DAZQ variable. The UV light curve reveals large amplitude (10%) pulsationsin
Boris T. Gänsicke, Edward M. Sion, Paula Szkody, Steve B. Howell, van Zyl L.   +4 more
core   +3 more sources

Confining the Edges of the GW Vir Instability Strip [PDF]

International Astronomical Union Colloquium, 1995
AbstractGround based optical spectroscopy as well as EUVE and HST observations are used for model atmosphere analyses of PG1159 stars in order to confine the GW Vir instability strip.
Werner, Klaus, Rauch, Thomas, Dreizler, S., Heber, Ulrich (Prof. Dr.)   +3 more
openaire   +4 more sources

A theoretical instability strip for rapidly oscillating Ap stars [PDF]

, 2002
M. S. Cunha
openalex   +2 more sources

Symmetry-breaking instability in a prototypical driven granular gas [PDF]

, 2002
Symmetry-breaking instability of a laterally uniform granular cluster (strip state) in a prototypical driven granular gas is investigated. The system consists of smooth hard disks in a two-dimensional box, colliding inelastically with each other and ...
A. Kudrolli, A. Kudrolli, B. Meerson, Baruch Meerson, C.S. Campbell, E. Livne, E.L. Grossman, Evgeniy Khain, H.M. Jaeger, H.M. Jaeger, I. Goldhirsch, J. Tobochnik, J.J. Brey, J.S. Olafsen, J.T. Jenkins, L.P. Kadanoff, M. Babić, M.A. Hopkins, M.C. Cross, P. Sunthar, R. Ramìrez, R.D. Wildman, S. McNamara, S.E. Esipov, X. He, Y. Du   +25 more
core   +1 more source

Pulsation in Intermediate-Mass Stars

Frontiers in Astronomy and Space Sciences, 2018
A new perspective of pulsation in stars within the δ Scuti instability strip has recently emerged as a result of Kepler observations. The majority of stars within the instability strip do not pulsate and practically all δ Scuti stars contain low ...
Luis A. Balona
doaj   +1 more source

Towards a pure ZZ Ceti instability strip [PDF]

Astronomy & Astrophysics, 2006
12 pages, 3 ...
Castanheira, B. G., Kepler, S. O., Costa, A. F. M., Giovannini, O., Robinson, E. L., Winget, D. E., Kleinman, S. J., Nitta, A., Eisenstein, D., Koester, D., Santos, M. G.   +10 more
openaire   +2 more sources

TESS Observations of the Pleiades Cluster: A Nursery for δ Scuti Stars

The Astrophysical Journal Letters, 2023
We studied 89 A- and F-type members of the Pleiades open cluster, including five escaped members. We measured projected rotational velocities ( $v\sin i$ ) for 49 stars and confirmed that stellar rotation causes a broadening of the main sequence in the ...
Timothy R. Bedding, Simon J. Murphy, Courtney Crawford, Daniel R. Hey, Daniel Huber, Hans Kjeldsen, Yaguang Li, Andrew W. Mann, Guillermo Torres, Timothy R. White, George Zhou   +10 more
doaj   +1 more source

On the possible existence of short-period g-mode instabilities powered by nuclear burning shells in post-AGB H-deficient (PG1159-type) stars [PDF]

, 2009
We present a pulsational stability analysis of hot post-AGB H-deficient pre-white dwarf stars with active He-burning shells. The stellar models employed are state-of-the-art equilibrium structures representative of PG1159 stars derived from the complete ...
A. H. Córsico, Althaus, Cox, Gautschy, Hine, J. M. González Pérez, L. G. Althaus, M. M. Miller Bertolami, Quirion, Quirion, S. O. Kepler, Saio, Solheim, Unno   +13 more
core   +5 more sources