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HD 74237


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Spectral synthesis in the ultraviolet. III - The spectral morphology of normal stars in the mid-ultraviolet
The morphology of 218 mid-UV spectra of stars ranging from O through Kin spectral type is examined. Several new line and continuum indices aredefined and their usefulness as temperature, luminosity, and metallicitydiscriminants is discussed. Mid-UV stellar continua are found to bemarkedly affected by abundance. A UV excess, delta(2600-V), is computedwhich is more sensitive by a factor of 10 to (Fe/H) than is delta(U-B).The relative strength of spectral lines in the mid-UV is not as stronglyaffected by abundance. Mid-UV spectra are much more sensitive to thetemperature of the stellar population than to either metallicity or thedwarf/giant ratio. Mg II 2800 shows unexpected behavior, displaying nosensitivity to abundance for cool stars and a reversed sensitivity in FGdwarfs such that metal-poor stars have stronger Mg II strengths at thesame temperature than more metal-rich stars.

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Observation and Astrometry data

Constellation:Τρόπις
Right ascension:08h39m23.62s
Declination:-63°33'05.1"
Apparent magnitude:9.529
Proper motion RA:-1.7
Proper motion Dec:-4.1
B-T magnitude:9.942
V-T magnitude:9.564

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 74237
TYCHO-2 2000TYC 8930-1426-1
USNO-A2.0USNO-A2 0225-04638549
HIPHIP 42458

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