Search Publications
BI Lyncis: A hydrogen-deficient binary consisting of two low-mass giants of spectral types early-B and G
Jeffery, C. S.; Aznar Cuadrado, R.
New physical elements of HR 7428 and its Hα behaviour.
Frasca, A.; Catalano, S.; Marilli, E. +1 more
Evidence for prolonged main sequence stellar evolution of F stars in close binaries
Suchkov, A. A.
Binary F stars exhibit large brightness anomaly, which is defined here as the difference between the absolute magnitude from the \mboxuvby photometry and the actual absolute magnitude of the star. We have found that the anomaly inversely correlates with the binary components separation. There is evidence that the correlation reflects actual popula…
The late-time expansion of the ejecta of SN 1987A
Jakobsen, P.; Jansen, R. A.
The evolution of the shape and size of the ejecta of SN 1987A is analyzed over a period of ~ 8 years based on HST images and spectra taken between 1278 and 4336 days after the supernova outburst. We combine both proprietary and archival HST data obtained with the FOC, WFPC2 and STIS. The low resolution near-UV prism FOC spectrum obtained at day 30…
Contribution to the search of binaries among Am stars. II. HD 81976 and HD 98880, double-lined spectroscopic binaries
Ginestet, N.; Prieur, J. -L.; Carquillat, J. -M.
We present the results of the observations of two Am stars of eighth magnitude, the double-lined spectroscopic binaries HD 81976 and HD 98880, carried out with the CORAVEL instrument at the Observatoire de Haute-Provence in order to determine their orbital elements. We found 1) for HD 81976: P = 5.655750 days, T = 2449785.941 HJD, omega = 341.4
ROSAT/Chandra observations of a bright transient in M 81
Tennant, A. F.; Wu, K.; Swartz, D. A. +1 more
We present a 10-year X-ray light curve and the spectra of a peculiar X-ray transient in the spiral galaxy M 81. The source was below the detection limit of ROSAT PSPC before 1993, but it brightened substantially in 1993, with luminosities exceeding the Eddington limit of a 1.5-M_sun compact accretor. It then faded and was not firmly detected in th…
Temporal and spatial variations of the quiet upper chromosphere from SOHO/SUMER observations of hydrogen Lyman lines
Kariyappa, R.; Curdt, W.; Varghese, B. A.
We have analyzed a time series of spectra in the hydrogen Lyman lines and the Lyman continuum obtained by the Solar Ultraviolet Measurements of Emitted Radiation (SUMER) spectrometer on the SOlar Heliospheric Observatory (SOHO). The time series of about 2 hours and 22 min was obtained on 1999 March 9 in a quiet region near the center of the solar …
Search for the [C{{II}}] 158 micron emission toward the blue compact dwarf galaxy I Zw 36
Onaka, T.; Mochizuki, K.
We observed the blue compact dwarf galaxy I Zw 36 in the [C Ii] 158 mu m line with the Infrared Space Observatory obtaining an upper limit for the line flux, F_[ion {C{ii}]} <= 1.1 10-20 W cm-2 (3 sigma ). A comparison with previous CO observations yields an upper limit for the [C Ii]/CO J = 1-0 line flux ratio, F_[ion {C{…
ISO continuum observations of quasars at z=1-4. I. Spectral energy distributions of quasars from the UV to far-infrared
Kawara, K.; Taniguchi, Y.; Oyabu, S. +8 more
Eight luminous quasars with -30 < MB < -27 at z = 1.4-3.7 have been observed in the mid- and far-infrared using ISO. All the quasars have been detected in the mid-infrared bands of ISOCAM, while no far-infrared detections have been made with ISOPHOT. SEDs (Spectral Energy Distributions) from the UV to far-infrared have been obtain…
The brightness of SN 1991T and the uniformity of decline-rate and colour corrected absolute magnitudes of supernovae Ia
Tonry, J.; Richtler, T.; Jensen, J. B. +2 more
We present a distance to