Search Publications
The multimode pulsation of the delta Scuti star V784 Cassiopeae
Thomson, J. R.; Derekas, A.; Garrido, R. +5 more
We present an analysis of new Johnson and Strömgren photometric and medium-resolution spectroscopic observations of the delta Scuti type variable star V784 Cassiopeae. The data were obtained in three consecutive years between 1999 and 2001. The period analysis of the light curve resulted in the detection of four frequencies ranging from 9.15 d
Timing analysis of the core of the Crab-like SNR G21.5-0.9
Mereghetti, S.; La Palombara, N.
The Crab-like SNR G21.5-0.9 was observed in the X-ray band (0.5-10 keV) by the XMM-Newton satellite for over 100 ks. The large effective area of the EPIC instrument has allowed us to perform a deep search for pulsations from the central core of . No pulsations were found with upper limits on the pulsed fraction between 7.5% and 40% (depending on f…
Quasi-molecular lines in Lyman wings of cool DA white dwarfs. Application to FUSE observations of G 231-40
Ferlet, R.; Lacour, S.; Vidal-Madjar, A. +3 more
We present new theoretical calculations of the total line profiles of Lyman alpha and Lyman beta which include perturbations by both neutral hydrogen and protons and all possible quasi-molecular states of H2 and H2+. They are used to improve theoretical modeling of synthetic spectra for cool DA white dwarfs. We com…
The spectroscopic binaries 21 Her and gamma Gem
Korotin, S. A.; Andrievsky, S. M.; Lehmann, H. +5 more
In the framework of a search campaign for short-term oscillations of early-type stars we analysed recently obtained spectroscopic and photometric observations of the early A-type spectroscopic binaries 21 Her and gamma Gem. From the radial velocities of 21 Her we derived an improved orbital period and a distinctly smaller eccentricity in compariso…
The Source of a coronal mass ejection in a decayed solar active region
Gosain, Sanjay; Prasad Choudhary, Debi; Srivastava, Nandita
We have studied the source of a coronal mass ejection (CME), which occurred in a decayed active region NOAA 7978 on 19 October, 1996. The active region NOAA 7978 first appeared on the solar disk on 2 June, 1996 and made more than five disk passages before it decayed. The event analysed in this paper was observed during fifth disk passage. We have …
Kinematic analysis of spiral structures in the local disk
Chiba, M.; Gouda, N.; Yano, T.
We present a method, based on the kinematic analysis of the Galactic disk stars near the Sun, to clarify whether the internal motions of the stellar system in spiral arms follow those expected in the density wave theory. The method is based on the linear relation between the phases of spatial positions and those of epicyclic motions of stars, as p…
Nice Observatory CCD measurements of visual double stars (4th series)
Gili, R.; Salaman, M.; Morlet, G.
We present 176 measurements of 167 visual double stars, made in 2000 and 2001 with the 50 cm refractor of the Nice Observatory and attached CCD camera, using an algorithm based on the adjustment of a tridimensional mathematical surface (Table 1). Position angle, angular separation and magnitude difference are given. 33 new binaries (HDS and TDS) d…
Extending the limits of globule detection. ISOPHOT Serendipity Survey observations of interstellar clouds II
Juvela, M.; Lisenfeld, U.; Kiss, Cs. +3 more
Small isolated clouds were discovered by the ISOPHOT 170 mu m Serendipity Survey (ISOSS) as faint I170<13 MJy sr-1 FIR sources. One of them is ISOSS J20246+6540, a cold (Td~ 14.5 K) pointlike ISOSS source without an IRAS pointsource counterpart. In the Digitized Sky Survey B band it is seen as a 3 arcmin size bi…
Multi-wavelength observations of a flare spray and CME of 1 October 2001
Li, Hui; You, Jianqi; Yu, Xingfeng +1 more
Using the Multi-channel Infrared Solar Spectrograph (MISS) at the Purple Mountain Observatory (PMO), we obtained the Hα , Ca Ii 8542 Å, He I 10 830 Å spectra and slit-jaw Hα images of a large dramatic flare spray near the south-west solar limb on 1 October 2001. For this event, we also got Extreme-Ultraviolet (EUV) images at 171 Å from TRACE and 1…
Analysis of a delta Scuti spectroscopic binary: CQ Lyncis
Carrier, F.; Udry, S.; Ginestet, N. +2 more
CQ Lyn is a new double-lined spectroscopic binary, composed of an Am delta Scuti and a solar-like star, with an orbital period of 12.50736 d and a zero-eccentricity. Physical parameters of both stars are well constrained. The characteristics of the primary are the following: M=1.714 Msun, Teff=6760 K, log L/Lsun= 1…