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HD 175741


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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

UVBY photometry in M39 and Delta Lyrae
Photoelectric uvby observations have been obtained for stars in themid-B to early-A spectral range in the fields of M39 and Delta Lyrae.The color and luminosity calibrations of Crawford for B, A, and F starshave been employed, as well as the new calibration for A0 stars ofHilditch et al. (1983). The resulting distance modulus for M39 is 7.23,with a mean E(b - y) color excess of 0.025. A distance modulus of 7.29and a mean reddening of 0.032 has been derived for ten stars in thefield of Delta Lyrae, but the existence of a cluster is not stronglyindicated in the present study. Comparison of photometric and rotationalvelocity data for the M39 stars confirms a correlation between deltac(0) and rotational velocity for A and A0 stars, and suggests that anevolutionary correction of only -3 delta c(0) be employed for stars inboth spectral classes.

Concentrations in the Local Association - Part Two - the Northern Concentrations Including the Alpha-Persei Pleiades M34 and Delta-Lyrae Clusters
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1983MNRAS.204..391E&db_key=AST

NGC 2516 and the Pleiades Group
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1972ApJ...173...63E&db_key=AST

A Possible New Galactic Cluster Involving δ Lyrae
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观测天体数据

星座:天琴座
右阿森松:18h55m09.31s
赤纬:+36°44'30.1"
视星:7.919
距离:294.118 天文距离
右阿森松适当运动:-2.4
赤纬适当运动:-3.8
B-T magnitude:7.939
V-T magnitude:7.921

目录:
适当名称   (Edit)
HD 1989HD 175741
TYCHO-2 2000TYC 2651-874-1
USNO-A2.0USNO-A2 1200-10063778
HIPHIP 92847

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