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HD 48754


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A new list of effective temperatures of chemically peculiar stars. II.
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A seven-year northern sky survey of AP stars for rapid variability
A high-speed photometric survey of 120 Ap stars in the northern sky, hasbeen conducted, between 1985 and 1991, in order to search for rapidvariability. Stars of spectral types, namely from B8 to F4, have beenselected for the survey. The selected pulsational variable stars occupythe hotter regions of the instability strip of the Hertzsprung-Russeldiagram. Noted is the absence of pulsations in the hotter B8-A3 Apstars; this does not, however, preclude the existence of pulsations,since HD 218495 was recently discovered to be a rapidly oscillating Ap(roAp) star. The primary result of this study is that variouscombinations of photometric indices, while pointing towards roAp starshaving the characteristic signatures of cool, SrCrEu stars, still failto isolate the roAp phenomenon from similar nonpulsating Ap stars.Color-magnitude and color-color diagrams are presented in order tocomplete this survey.

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Observation and Astrometry data

Constellation:Licorne
Right ascension:06h44m45.62s
Declination:-04°23'36.8"
Apparent magnitude:8.549
Distance:243.902 parsecs
Proper motion RA:-5.2
Proper motion Dec:0.8
B-T magnitude:8.876
V-T magnitude:8.576

Catalogs and designations:
Proper Names
HD 1989HD 48754
TYCHO-2 2000TYC 4807-1423-1
USNO-A2.0USNO-A2 0825-03088983
HIPHIP 32312

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