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Mesures de vitesses radiales. VIII. Accompagnement AU sol DU programme d'observation DU satellite HIPPARCOS
We publish 1879 radial velocities of stars distributed in 105 fields of4^{\circ} \times 4^{\circ}. We continue the PPO series \cite[(Fehrenbachet al. 1987;]{Feh87} \cite[Duflot et al. 1990, 1992 and 1995),]{Du90}using the Fehrenbach objective prism method. Table 1 only available inelectronic form at CDS via to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/Abstract.html
| The development of the symbiotic nova PU Vulpeculae in the years 1984-1992
Spectroscopic observations of the symbiotic nova PU Vul between 1984 and1990, i.e. before and after the transition to the nebular state arepresented. They fill in some gaps not only in the temporal but also inthe spectral coverage of the system, including many observations in thered range which has not as well been monitored in the past as the bluerange. A detailed description in particular of the emission lines (whichare also present before the transition phase) is given, documenting thespectral evolution of PU Vul. The spectroscopic observations aresupplemented by some photometry performed between 1985 and 1992.
| Photometry of symbiotic stars - an international campaign.
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1991CoSka..21..303H&db_key=AST
| Photoelectric UBV Observations of PU Vul in 1982
Not Available
| A magnitude limited stellar X-ray survey and the F star X-ray luminosity function
An X-ray survey has been conducted of stars brighter than visualmagnitude 8.5 that have serendipitously fallen into the fields of viewof the Imaging Proportional Counter of the Einstein Observatory. Thesurvey includes 227 separate 1 x 1 deg fields, containing 274 stars witha visual magnitude of no more than 8.5 and covering a wide range ofspectral types and luminosity classes. X-ray emission was detected from33 stars, and upper limits have been determined for the remainder of thesample. F type stars dominate the detected sample, and most of these areshown to be dwarfs. An X-ray luminosity function for dF stars has beendeduced, and reveals that the average 0.2-4.0 keV luminosity of thesestars is around 10 to the 29th erg/sec. Constraints have been placed onthe high luminosity tails and medians of the X-ray luminosity functionsfor other types of stars.
| Photoelectric UBV Observations of PU Vul in 1981
Not Available
| Photometric observations of PU Vulpeculae (Nova VUL 1979) in faint phases
Five-color (UBVRI) observations made for PU Vulpeculae from September15, 1980 to February 7, 1981 are presented. The light curve shows rapidbrightenings and fadings; one phase of brightening is the fastest rateever observed. The correspondence of the color curves to the light curveis reported. The U-B and B-V colors were reddest at the end of April,1980, while the star was fading rapidly, and the V-R and V-I werereddest in early November, 1980, shortly after the minimum brightnesswas reached. Monitoring observations to detect rapid light variationsseemed to reveal some light variations which are judged to be probablyintrinsic. An anticorrelation between V and B magnitudes may suggest apresence of two components in the system.
| Infrared observations of Kuwano's novalike object
Infrared observations made in April, 1979 of the nova-like objectdiscovered by Kuwano in Vulpecula are reported. Measurements in therange 1 to 5 microns were obtained with an infrared photometer adaptedto the Cassegrain focus of a 1-m telescope on April 13 and April 15,1979. Observations are shown to lie close to the energy distribution ofa black body at 3200 K, with an excess in the visible region. Such atemperature would correspond to a main sequence star of type M 2 or agiant of type M O, however, the V magnitude of the object suggests thatit lies above the main sequence. It is concluded that the nova-likeobject is probably related to the symbiotic stars, consisting of abinary containing a variable cool star which can expand to provoke masstransfer onto a normally faint compact companion.
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Membre dels grups següents:
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Dades d'Observació i Astrometria
| Constel·lació: | Vulpecula |
| Ascensió Recta: | 20h21m50.55s |
| Declinació: | +21°24'10.8" |
| Magnitud Aparent: | 8.197 |
| Distancia: | 469.484 parsecs |
| Moviment propi RA: | 2.1 |
| Moviment propi Dec: | 3.3 |
| B-T magnitude: | 8.069 |
| V-T magnitude: | 8.187 |
Catàlegs i designacions:
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