Results 51 to 60 of about 12,020 (316)

Radial Pulsation in Variable Stars with Mass Loss [PDF]

International Astronomical Union Colloquium, 1993
AbstractIt is possible to show that cool giants with very large photospheric scale heights do not perfectly reflect pulsational waves at the photosphere. This means that for these stars the classical formulation of pulsation in which the outer boundary for the resonance cavity is assumed to be perfectly reflecting is not valid.
openaire   +1 more source

”ASYMPTOTIC PARABOLA” FITS FOR SMOOTHING GENERALLY ASYMMETRIC LIGHT CURVES

Odessa Astronomical Publications, 2016
A computer program is introduced, which allows to determine statistically optimal approximation using the "Asymptotic Parabola" fit, or, in other words, the spline consisting of polynomials of order 1,2,1, or two lines ("asymptotes") connected with a ...
K. D. Andrych, I. L. Andronov, L. L. Chinarova, V. I. Marsakova   +3 more
doaj   +1 more source

The Classificiation of Kepler B star Variables

, 2012
The light curves of 252 B-star candidates in the Kepler data base are analyzed in a similar fashion to that done by Balona et al. (2011) to further characterize B star variability, increase the sample of variable B stars for future study, and to identify
Jackiewicz, Jason, McKeever, Jean, McNamara, Bernard J.   +2 more
core   +1 more source

A survey for pulsating subdwarf B stars with the Nordic Optical Telescope [PDF]

, 2010
A search programme for pulsating subdwarf B stars was conducted with the Nordic Optical Telescope on La Palma over 59 nights between 1999 and 2009. The purpose of the programme was to significantly extend the number of rapidly pulsating sdB stars to ...
A. Ulla, Allard, Barlow, Barlow, Beers, Bessell, Billeres, Billeres, Billères, Billéres, Bixler, Bonanno, Brassard, C. Rodríguez-López, Charpinet, Charpinet, Christensen-Dalsgaard, Dorman, Drechsel, Dreizler, Edelmann, Eisenstein, F. Pérez Hernández, Fontaine, Fontaine, Geier, Green, Green, Hagen, Han, Han, Heber, Heber, Heber, Heber, Heber, Hu, Hu, J. H. Telting, J. M. González-Pérez, J.-E. Solheim, Jeffery, Jeffery, Kawaler, Kilkenny, Kilkenny, Kilkenny, Kilkenny, Kilkenny, Kilkenny, Kilkenny, Kilkenny, Koen, Koen, Koen, Koen, Koen, Koen, Koen, Koen, Kuschnig, Lamontagne, Lisker, Lutz, Martin, Maxted, McCook, Michel, Moehler, Munari, Napiwotzki, Napiwotzki, Napiwotzki, Nather, Noguchi, O'Donoghue, O'Donoghue, O'Toole, Oreiro, Oreiro, Oreiro, Oreiro, Piccioni, R. H. Østensen, R. Oreiro, R. Silvotti, Ramsay, Randall, Randall, Reed, Reed, Reed, Reed, Saffer, Schlegel, Schuh, Silvotti, Silvotti, Silvotti, Silvotti, Silvotti, Silvotti, Solheim, Solheim, Stepanian, Stobie, Stobie, Stoughton, Telting, U. Heber, Vuckovic, Vuckovic, Walker, Wisotzki, Woudt, Young, Zhou, Østensen, Østensen, Østensen, Østensen, Østensen, Østensen   +122 more
core   +1 more source

Epigenetic blind spots – the role of DNA methylation dynamics in stem cell‐based models of embryogenesis

FEBS Letters, EarlyView.
Embryo‐like structures (stembryos) are an innovative tool, but they are hindered by experimental variability and limited developmental potential. DNA methylation is crucial for mammalian development, but its status in stembryo models is poorly characterized.
Sara Canil, Anna Corrà, Annalisa Scapolatiello, Chengxiang Qiu, Gianluca Amadei   +4 more
wiley   +1 more source

Comparing the asteroseismic properties of pulsating extremely low-mass pre-white dwarf stars and δ Scuti stars

EPJ Web of Conferences, 2017
We present the first results of a detailed comparison between the pulsation properties of pulsating Extremely Low-Mass pre-white dwarf stars (the pre-ELMV variable stars) and δ Scuti stars.
Arias J.P.Sánchez, Córsico A.H., Romero A.D., Althaus L.G.   +3 more
doaj   +1 more source

A variable star survey of the open cluster M37 [PDF]

, 2001
A CCD photometric study of the dense galactic open cluster M37 is presented and discussed. The majority of the analysed data are time-series measurements obtained through an R_C filter.
B. Csák, Bertelli, Frandsen, G. Fűrész, Gy. M. Szabó, Jefferys III, Jorissen, K. Sziládi, K. Sárneczky, Kałuzny, Kolláth, L. L. Kiss, Lee, Mermilliod, Petersen, Robin, Rodríguez, Rucinski, Rucinski, Schild, Stellingwerf, Upgren, West   +22 more
core   +3 more sources

An unexpected alternative viologen electron mediator site in tungsten‐containing formate dehydrogenase

FEBS Letters, EarlyView.
An unexpected alternative interaction site for ethyl viologen was identified in formate dehydrogenase 1 from Methylorubrum extorquens. Combined mutagenesis, kinetic analysis, and docking revealed that aromatic residues near an iron–sulfur cluster enable flavin mononucleotide‐independent electron transfer, offering a framework for engineering improved ...
Eleni G. Poloniataki, Yong Hwan Kim
wiley   +1 more source

Type II Cepheids: period-luminosity-metallicity relations for the Population II distance scale

Frontiers in Astronomy and Space Sciences
Type II Cepheids are a class of pulsating variable stars that play a critical role in our understanding of stellar evolution, distance measurement and tracing the structure and kinematics of old stars in nearby galaxies.
Susmita Das, Susmita Das, Susmita Das, Anupam Bhardwaj, Marcella Marconi   +4 more
doaj   +1 more source

WAVELET ANALYSIS OF 173 SEMI-REGULAR VARIABLES

Odessa Astronomical Publications, 2010
We made the wavelet analysis of 173 semi-regular pulsating variable stars of different sub-types. For the analysis, we have used 1,000,000 individual brightness estimates from the published international databases of the VSOLJ (Japan) and AFOEV (France).
L. L. Chinarova
doaj   +1 more source