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HD 10518


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Photoelectric observations of lunar occultations. XII
Occultation observations of 414 events observed between 6 July 1979 and4 September 1980 with the 0.76-m telescope of McDonald Observatory arereported. Timings and data on double stars are given. Angular diameterinformation in six cases is included. The stars concerned with their runnumbers are: SAO 161754 (5270); 94027 (Alpha Tau) (5319, 5381, 5454);159370 (Gamma Lib) (5325, 5571); 162413 (43 Sgr) (5332); 97472 (3 Cnc)(5414); and 93955 (Theta Tau) (5445).

The influence of the envelope in the variations of transitory type Be stars
The contribution of the stellar envelope to variations oftransitory-type Be stars, which are alternately of types B and Be, isinvestigated. The Rojas-Herman classification is applied to thequantification of long-term stellar variation for a sample of Be starsbrighter than magnitude 7, and compared with the spectral properties ofthese stars. A relation is derived between the equivalent widths of theH-alpha and H-beta lines and the stellar U-B index. The U-B index isthen calibrated as a function of the Balmer discontinuity in order toseparate the contributions of the star and its envelope to the emission.The separate U-B indices derived for the star, which are characterizedby long-term variations, and the envelope, which is sensitive toshort-term variations, are observed to be additive, implying that theobserved flux is a convolution of the fluxes emitted by the star and itsenvelope.

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Dades d'Observació i Astrometria

Constel·lació:Pisces
Ascensió Recta:01h42m40.90s
Declinació:+05°54'08.5"
Magnitud Aparent:9.109
Moviment propi RA:116.4
Moviment propi Dec:30.6
B-T magnitude:9.619
V-T magnitude:9.152

Catàlegs i designacions:
Noms Propis
HD 1989HD 10518
TYCHO-2 2000TYC 35-601-1
USNO-A2.0USNO-A2 0900-00401758

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