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HD 170271


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The early A type stars - Refined MK classification, confrontation with Stroemgren photometry, and the effects of rotation
The MK classification system for the early A-type stars is refined, anda parallel system of standards for the broad-lined stars is introduced.With this improved system, stars may be classified with significantlygreater precision than before. It is shown that spectral types in thissystem are not systematically affected by rotational line broadening. Atotal of 372 early A-type stars are classified, and a confrontation ofthese spectral types with Stroemgren photometry reveals a number ofsystematic photometric effects of rotation. In particular, high v sin istars are systematically redder than low v sin i stars of the samespectral type, and the beta index is weakened by rotation. It isconcluded that precise spectral classification in conjunction withStroemgren and H-beta photometry can potentially provide a valuablecheck and input to the theory of the atmospheres of rotating stars.

Photoelectric photometry of early-type stars in a field in Ophiuchus
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Southern open clusters II. UBV and Hbeta photometry of 11 clusters between galactic longitudes 259d and 280d
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1973A&AS....9...97V&db_key=AST

Untersuchung der offenen Sternhaufen IC 4665, NGC 6633, IC 4756
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Dades d'Observació i Astrometria

Constel·lació:Ophiucus
Ascensió Recta:18h28m11.77s
Declinació:+07°21'19.2"
Magnitud Aparent:8.954
Moviment propi RA:3
Moviment propi Dec:-1.5
B-T magnitude:9.18
V-T magnitude:8.973

Catàlegs i designacions:
Noms Propis   (Edit)
HD 1989HD 170271
TYCHO-2 2000TYC 445-149-1
USNO-A2.0USNO-A2 0900-12913267
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