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HD 23128


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UBV (RI)c standard stars in the E- and F-regions and in the Magellanic Clouds - a revised catalogue.
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UBV(RI)c photometry of some standard sequences in the Harvard F regions and in the Magellanic Clouds
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1988MNRAS.231.1047M&db_key=AST

Standard Stars for VRI Photometry with S25 Response Photocathodes
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Isolated Stroemgren spheres as a source of galactic H alpha emission
The isolated H alpha emission features reported by Reynolds et al. areidentified with Stroemgren spheres surrounding observed O stars; theroot mean square electron densities and Stroemgren radii are calculatedfrom the observed emission measure and stellar type. The density has anaverage value of 2 per cu cm but increases to 3.3 per cu cm for starswithin 200 pc of the galactic plane. An analysis of the Catalogue ofGalactic O Stars shows that enhanced H alpha emission is observed aroundall known O stars. The diffuse component of H alpha emission is what onewould expect from the line-of-sight overlapping of isolated Stroemgrenspheres surrounding B stars and appears to correlate with features onextinction maps, as derived. There is no compelling reason to suggestany large-scale intercloud ionization from H alpha data alone.

Further observations of magnitude with a coarse grating
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1952MNRAS.112..665W&db_key=AST

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Observation and Astrometry data

Constellation:Ύδρος
Right ascension:03h36m12.24s
Declination:-73°58'25.7"
Apparent magnitude:7.627
Distance:214.592 parsecs
Proper motion RA:28.2
Proper motion Dec:63.2
B-T magnitude:9.067
V-T magnitude:7.746

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 23128
TYCHO-2 2000TYC 9158-876-1
USNO-A2.0USNO-A2 0150-01544711
HIPHIP 16797
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