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FCAPT uvby Photometry of the mCP Stars HD 16545, HD 93226, HR 7575, and HR 8206
The Four College Automated Photoelectric Telescope (FCAPT) obtaineddifferential Strömgren uvby observations of the magnetic CP (mCP)stars HD 16545, HD 93226, HR 7575, and HR 8206. These are the firstreported from the FCAPT. HD 16545, with its largest amplitudes (0.06mag) being those in v and in b, has a period of 1.61926 days, close toits period from Hipparcos photometry. The HD 93226 photometry exhibits aperiod of 1.72907 days, with the v, b, and y light curves in phase. Theu light curve is shifted by 0.05 to 0.10 in phase. Its u amplitude is arelatively large 0.10 mag. The v photometry of HR 7575 is consistentwith the 223.826 day period of Mikulasek et al. HR 8206 is asmall-amplitude variable with a period of 1.5849 days.
| uvby FCAPT photometry of the metallic-lined stars 60 Tau and HR 1528 and the magnetic CP stars HR 8216 and HR 8770
Differential Strömgren uvby observations from the Four CollegeAutomated Photoelectric Telescope (FCAPT) are presented for themetallic-lined stars 60 Tau and HR 1528 and the magnetic ChemicallyPeculiar stars HR 8216 and HR 8770. The first star, which is a deltaScuti variable, was found not to change its mean magnitudes. HR 1528 isbest described as constant. A decade of photometry of HR 8216 shows thatits b and y values have changed by -0.016 and -0.010 mag, respectively,over this time and now can be considered a photometric variable. For HR8770 a period of 5.3923 days is derived with the photometric variabilitybeing generally in phase. The light curves also suggest possible surfaceabundance inhomogeneities.Tables 2, 3, 4 and 6 are only available in electronic form at the CDSvia anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or viahttp://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/401/357
| Speckle Interferometry of New and Problem Hipparcos Binaries. II. Observations Obtained in 1998-1999 from McDonald Observatory
The Hipparcos satellite made measurements of over 9734 known doublestars, 3406 new double stars, and 11,687 unresolved but possible doublestars. The high angular resolution afforded by speckle interferometrymakes it an efficient means to confirm these systems from the ground,which were first discovered from space. Because of its coverage of adifferent region of angular separation-magnitude difference(ρ-Δm) space, speckle interferometry also holds promise toascertain the duplicity of the unresolved Hipparcos ``problem'' stars.Presented are observations of 116 new Hipparcos double stars and 469Hipparcos ``problem stars,'' as well as 238 measures of other doublestars and 246 other high-quality nondetections. Included in these areobservations of double stars listed in the Tycho-2 Catalogue andpossible grid stars for the Space Interferometry Mission.
| Radial velocities. Measurements of 2800 B2-F5 stars for HIPPARCOS
Radial velocities have been determined for a sample of 2930 B2-F5 stars,95% observed by the Hipparcos satellite in the north hemisphere and 80%without reliable radial velocity up to now. Observations were obtainedat the Observatoire de Haute Provence with a dispersion of 80Ä,mm(-1) with the aim of studying stellar and galactic dynamics.Radial velocities have been measured by correlation with templates ofthe same spectral class. The mean obtained precision is 3.0 km s(-1)with three observations. A new MK spectral classification is estimatedfor all stars. Based on observations made at the Haute ProvenceObservatory, France and on data from The Hipparcos Catalogue, ESA.Tables 4, 5 and 6 are only available in electronic form at the CDS viaanonymous ftp to cdsarc.u-strasbg.fr or viahttp://cdsweb.u-strasbg.fr/Abstract.htm
| UVBY photometry of the mCP stars HD 35298, 19 Lyrae, HD 192678, and HR 8216
Differential Strömgren uvby observations from the Four CollegeAutomated Photoelectric Telescope are presented for the mCP stars HD35298, 19 Lyr, HD 192678, and HR 8216. The period for HD 35298 of1.85457 days is a revision of North's value while that for 19 Lyr of7.0980 days is alias of that found by Winzer. HD 192678 is found to be asmall amplitude photometric variable with the 6.4186 day period proposedby Leroy from polarization measurements. For HR 8216, observations takenbetween 1995 and 1998 confirm that the star has remained constant atleast since 1990. Tables 2, 3, 4 and 6 are only available in electronicform at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5)or via http://cdsweb.u-strasbg.fr/Abstract.html
| Photoelectric Photometry of Herbig Ae/be and Related Stars in the Vilnius Photometric System
A catalog of photoelectric photometry of 62 Herbig Ae/Be and relatedstars in the Vilnius system is presented. It contains stars down to V =12 mag located mainly in the northern hemisphere and observed in theperiod of 1994--1996.
| Etude spectrophotométrique des étoiles les plus brillantes de l'amas M 39
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Membre dels grups següents:
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Dades d'Observació i Astrometria
| Constel·lació: | Cygnus |
| Ascensió Recta: | 21h22m28.96s |
| Declinació: | +49°29'29.1" |
| Magnitud Aparent: | 6.843 |
| Distancia: | 291.545 parsecs |
| Moviment propi RA: | 10.5 |
| Moviment propi Dec: | -7 |
| B-T magnitude: | 6.888 |
| V-T magnitude: | 6.847 |
Catàlegs i designacions:
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