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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
| A first optical spectroscopic monitoring of the post-AGB star SAO 96709=IRAS 07134+1005: pulsation and shock waves.
We have performed a spectroscopic monitoring of the F5I "post-AGB" starSAO 96709 on the Hα and NaD spectral regions in order to studyatmospheric motions that could be associated with shock wave propagationthroughout the stellar atmosphere. Twenty-one Hα spectra andseventeen NaD spectra were obtained as regularly as possible, over a 14month interval. We find that the Hα, NaD, and other line profilesare strongly variable on a timescale of a few days. The 5853.688A BaIIand 6587.622A CI lines also reveal a variation in their radialvelocities. Fourier analysis of these variations yields one main periodof 27.3 days and three secondary ones of 32.9, 11.9 and 7.1 days. TheHα profiles and the velocity variations are good evidence forcomplex atmospheric dynamics that are related to shock wave propagationthroughout the atmospheric layers. These observed spectral features arein good agreement with the recently found photometric variability andpoint to a pulsating nature for SAO 96709 = HD 56126 = IRAS 07134+1005.
| Radial-velocity measurements. V - Ground support of the HIPPARCOS satellite observation program
The paper presents data on 1070 radial velocity measurements of starsdistributed in 39 fields measuring 4 deg x 4 deg. The PPO series ofFehrenbach et al. (1987) and Duflot et al. (1990) is continued using theFehrenbach objective prism method.
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| קבוצת-כוכבים: | כלב קטן |
| התרוממות ימנית: | 07h15m30.17s |
| סירוב: | +09°29'51.2" |
| גודל גלוי: | 7.253 |
| מרחק: | 92.937 פארסק |
| תנועה נכונה: | -36.4 |
| תנועה נכונה: | -29.1 |
| B-T magnitude: | 7.618 |
| V-T magnitude: | 7.284 |
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