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Carbon abundance in the primaries of six Algol-type stars.
Cugier, H.
The abundance analysis of carbon in six Algol-type stars was performed using IUE archival data. In order to interpret the observed spectra, both LTE and non-LTE line profiles are computed. A cosmic abundance of carbon is obtained, log N(C/H) = - 3.48, in the primary components of Delta Librae, U Sagittae, RS Vulpeculae and u Herculis. All these sy…
The 2.8-hour flux modulation of the cataclysmic variable PG 1711+336.
Branduardi-Raymont, G.; Mason, K. O.; Rosen, S. R. +1 more
High-speed optical photometry of the cataclysmic variable PG1711 + 336 is used to confirm the presence of a 2.8-hour periodic modulation in the light curve of the star and to improve its ephemeris. Pronounced flickering on time-scales between 10 and 20 minutes is found superimposed on the 2.8-hour variation. Three hours of time-resolved spectrosco…
Astrophysical contributions of the International Ultraviolet Explorer.
Kondo, Yoji; Maran, Stephen P.; Boggess, Albert
The International Ultraviolet Explorer (IUE) was launched on Janurary 26, 1978. The mission was conceived from the beginning as an ultraviolet spectroscopic observatory that could be used by astronomers as they were accustomed to observing from the ground, without special training in orbital operations. The authors describe some highlights of the …
The High-Resolution Spectrum of the Pulsating, Pre-White Dwarf Star PG 1159-035 (GW Vir)
Husfeld, D.; Sion, E. M.; Wesemael, F. +3 more
High-resolution and low-resolution UV spectra and a high-resolution optical spectrum were obtained for PG 1159-035, revealing apparent photospheric absorption features with defined cores from N V 1240 A, N IV 1270 A, O V 1371 A, and C IV 1550 A. The photospheric velocity derived using all of these lines except for C IV is about +35 km/s. Equivalen…
X-Ray, Ultraviolet, and Optical Observations of the Intermediate Polar FO Aquarii (H2215-086)
Mukai, K.; Maraschi, L.; Tanzi, E. G. +9 more
An extensive set of quasi-simultaneous, multiwavelength observations of the intermediate polar FO Aqr (H2215-086) obtained in 1983-1985 with the Exosat and IUE satellites and from La Palma Observatory are presented. The rotational 21 minute period and sideband periods due to beating with the orbital modulation are observed in the optical band and …
Ultraviolet Extinction Differences within NGC 6530
Bohm-Vitense, Erika; Boggs, Don
Ultraviolet extinction curves are presented for 14 stars in the very young cluster NGC 6530. The variation of the short-wavelength extinction is consistent with that expected based on random errors alone, although the weakest extinction is found only toward the cluster center. Variations significantly larger than the measurement uncertainty are fo…
500 3200 Å observations of the interacting binary stars V356 Sgr and β Lyr
Polidan, R. S.
In this paper we present new results from the Voyager ultraviolet spectrometers and the IUE spacecraft on V356 Sgr and β Lyr. The V356 Sgr observations cover, in detail, two eclipses and include one IUE high dispersion SWP image. During both eclipses the total strength of the UV emission lines were found to be invariant. Also, an uneclipsed UV con…
EXO 032957-2606.9 : a new long-period probable AM Herculis binary.
Tagliaferri, G.; Beuermann, K.; Giommi, P. +2 more
The identification of the serendipitous Exosat X-ray source EXO032957-2606.9 with a new probable long-period AM Herculis binary is reported. The orbital period is (228 + or - 1) min (1-sigma error). The classification as an AM Herculis binary is based on the very soft X-ray spectrum and the characteristics of the high-excitation optical spectrum. …
On the Possible Detection of Organic Dust-borne C 3H + Ions in the Coma of Comet Halley
Reme, H.; Korth, A.; Lin, R. P. +4 more
The heavy ion analyzer (PICCA) on board the Giotto spacecraft was used to determine the composition of positively charged ions in the environment of Comet Halley. Here it is argued that a distinct peak at 37 amu, observed in the mass spectrum inside the ionopause, is due to C3H(+). It is further argued that the dominant source of this ion, as well…
Complex organic ions in the atmosphere of Comet Halley
Anderson, K. A.; Reme, H.; Korth, A. +7 more
The ordered series of broad mass groups observed in thermal ion mass spectra taken in the coma of Comet Halley by the RPA2-PICCA instrument aboard the Giotto spacecraft is shown to be characteristic of molecules rich in hydrogen, carbon, nitrogen, and oxygen, and does not imply the presence of a long chain polymer such as polyoxymethylene. Inside …