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HD 21047


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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 survey for rapid variability among early main-sequence A stars
A survey of nonpeculiar early (A0-A5) main-sequence A stars for rapid,low-amplitude variability is presented. The survey is also anindependent test of the main-sequence mass-loss theory proposed byWillson et al. (1986). All observations were gathered with theUniversity of Wisconsin Two-Star Photometer. Several period-searchingmethods are used to analyze time series of differential-photometricdata. This instrument coupled with a computerized high-speed datacollection system was used with small telescopes at Pine BluffObservatory and Table Mountain Observatory. Several period-searchmethods are used to analyze time series of differential-photometricdata. This instrument and data-reduction technique allow millimagnitudelight variations to be detected. The survey also discovered severallow-amplitude Delta Sct stars, all of which are in or blueward of therecognized instability strip.

SAO 38830, a New Eclipsing Binary in Perseus
Visual observations indicate that a recently discovered eighth magnitudevariable (SAO 38830) is an eclipsing binary with a period of 3.0461 or6.0922 days.

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Pozíciós és asztrometriai adatok

Csillagkép:Perszeusz
Rektaszcenzió:03h25m19.52s
Deklináció:+40°57'12.0"
Vizuális fényesség:7.215
Távolság:211.864 parszek
RA sajátmozgás:1.9
Dec sajátmozgás:-13.1
B-T magnitude:7.164
V-T magnitude:7.211

Katalógusok és elnevezések:
Megfelelő nevek   (Edit)
HD 1989HD 21047
TYCHO-2 2000TYC 2865-544-1
USNO-A2.0USNO-A2 1275-02288773
HIPHIP 15944

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