Search Publications
An Evidence for Gaseous Envelope Surrounding the RS CVn System lambda And
Glebocki, R.; Sikorski, J.
MgII h and k profiles are analyzed in 62 high dispersion IUE spectra of a long-period RS CVn binary lambda And. We find strong evidence of the presence of circumstellar matter surrounding the binary system. Estimated lower mass limit of the envelope is 6.6 times 10^{-14} Modot. We present evidence for the changes with time of the perias…
Accretion behaviour in SS Cygni.
Gaudenzi, S.; Giovannelli, F.; Claudi, R. U. +1 more
The He II (1640 A) equivalent widths are determined from 28 IUE short wavelength low resolution spectra of SS Cygni in quiescence and in outburst. By using the boundary layer model for cataclysmic variables (Patterson and Raymond 1985), the mass accretion rate M(He II) is derived. This mass accretion rate is practically coincident with the rate of…
The long-period semi-detached giant binary system 5 Ceti.
Eaton, Joel A.; Barden, Samuel C.
The binary system 5 Ceti consists of a K3 III star at or near its Roche lobe and a small hot companion best studied in the satellite ultraviolet. The hot radiation source at the secondary star is immersed in the chromosphere of the K giant, and the slight enhancements of a few UV absorption lines at secondary minimum are used to estimate chromosph…
On the possibility of interpretation of MgII profiles in hybrid stars.
Jasinski, M.
Semiempirical models of expanding chromospheres have been constructed for five hybrid stars by fitting of the computed Mg II profiles to the observational data. The mass loss rates obtained from these models range from 1.34×10-9 to 3.14×10-7M_sun;/year. On the basis of energetic considerations a possible mechanism acceleratin…
Search for the circumstellar envelopes around the late-type binary systems.
Glebocki, R.; Sikorski, J.
For 21 G and K type binary systems of luminosity class II-IV analysis of Mg II emission lines based on the IUE archive data is performed in order to establish the main contributor to the h3 and k3 absorption features. Asymmetry of the emission as well as shift of absorption relative to the emission center can be used as an in…
SW Lacertae, W Ursae Majoris, YY Eridani and the prevalence of starspots in cool contact binaries.
Eaton, J. A.
Detailed light curve analyses have been carried out for three cool contact binaries to determine (1) what makes the larger component appear cooler and (2) how a period change affects the structure of the common envelope.
Implications of the light curve of the A-type W UMa binary V566 Ophiuchi.
Eaton, Joel A.
Broadband (2585-3200-A) IUE photometric observations of V566 Oph obtained in three 8-h shifts on July 17-19, 1984 are reported and solved simultaneously with the ground-based optical observations of Bookmyer (1976). The observed light curves are fit to theoretical Roche-model light curves using the computer program described by Eaton (1986). The d…
A search of tidal interaction in RS CVn stars : UV emission variations in lambda And.
Glebocki, R.; Sikorski, J.; Bielicz, Elzbieta +1 more
31 spectra obtained with the LWR camera of the IUE satellite in the period 1978 - 83 are analysed. Except strong Mg II h and k lines three other weak emissions are found. Changes of intensities of the emission lines are not correlated with photometric (rotational) period. The Mg II emissions show very good correlation with half of the orbital peri…
IUE observations of the contact binary XY Leonis.
Vilhu, O.; Rucinski, S. M.
IUE observations (FES light curves, LWR Mg II emission data, and an SWP spectrum) obtained on June 11, 1982 are reported for XY Leo. The Mg II fluxes were measured at two primary minima, one secondary minimum, and one orbital quadrature. The data are presented in tables and spectra and analyzed. The orbital-average relative flux f(Mg II)/f(bol) is…
IUE observations of W UMA systems AE Phoenicis and TY Mensae.
Rucinski, S. M.
SWP spectra of AE Phe and TY Men are presented and discussed. The spectrum of AE Phe is typical in showing strong emission lines which originate in the chromosphere and transition region. On the basis of the strength of the He II emission line the author predicts that AE Phe should be a moderately strong X-ray source. The spectrum of TY Men is too…