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HD 178993


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Mid-ultraviolet and optical photometry of helium stars
Mid-ultraviolet and optical photometric analysis of helium stars arepresented. A linear relation exists between the effective temperaturederived from model atmospheres and (1965-V)0 index. The effectivetemperatures derived from (1965-V)0 index are somewhat higher than thatof MK spectral type estimates especially for late B-type helium objects.

Observational problems of investigation of stars with anomalous helium lines.
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Search for light variability among eight stars with anomalous helium content
A search for periodic light variability was carried out among eightstars with anomalous helium content. No variability was detected duringthe observation period for HD 178993, HD 207538, and HD 209339. Theperiod obtained for HD 184927 by Bond and Levato (1977) was confirmed.For HD 191980, HD 208266, and HD 217833, photometric variability wasdetected and periods were obtained.

New Peculiar Stars Noted on Objective-Prism Plates
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Observation and Astrometry data

Constellation:Flèche
Right ascension:19h10m09.23s
Declination:+17°02'08.0"
Apparent magnitude:9.258
Proper motion RA:-0.7
Proper motion Dec:-9.4
B-T magnitude:9.739
V-T magnitude:9.298

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 178993
TYCHO-2 2000TYC 1590-1260-1
USNO-A2.0USNO-A2 1050-13198312
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