Other
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992rmxaa..24..187h&link_type=abstract
Revista Mexicana de Astronomia y Astrofisica, 24, 187 (1992)
Other
3
Scientific paper
RESUMEN G. Haro descubri6 que una estrella debll V = 13.11, B-V = -0.15) y de alta latitud galactica presenta emisi6n en Ha, tiene tipo espectral BO-Bi y tiene Ia apariencia de una estrella Be de poblaci6n I. Silo anterior fuera cierto seri dificil explicar su posici6n a Z = 19.7 kpc considerando que se form6 cerca del piano galactico hace solo 1-2 x . Las alas en absorci6n, fuera de los centros en emisi6n, de las lfneas de Balmer, permiten una estimaci6n de log g y su comparaci6n con otras estrellas tipo B de diversas luminosidades; el resultado para log g es aproximadamente 4.7, lo que indica que la estrella no es un objeto de la secuencia principal. Si la estrella fuera un objeto de Poblaci6n II con masa 0.6 Me, entonces Mv serfa aproximadamente +2 y la distancia al piano serfa solamente 1.6 kpc. Posiblemente la estrella de Haro se encuentra en transici6n entre la fase de rama asint6tica gigante y la de estrella central de una nebulosa planetaria. Se recomienda una busqueda de objetos similares en cumulos globulares. ABSTRACT A faint (V = 13.11, B-V = -0.15) high4atitude (b = +640) star discovered by G. Haro to have Ha in emission is of type BO-B 1, and has the appearance of a typical Population I Be star. If that were so, there would be difficulty in accounting for the star's presence at z = 19.7 kpc if it were formed near the plane no more than 1-2 x 10 years ago. The Balmer absorption wings, outside the emission cores, make possible an estimate of log g by comparison with other early B-type stars of various luminosities; the result is log g is about 4.7, which shows that Haro's star lies below the main-sequence. If it is a Population II star with mass about 0.6 Me, then Mv is about +2, and the distance is only 1.6 kpc. Possibly Haro's star is in transition between the AGB and planetary nebula central star stages. A search of globular clusters for similar objects is recommended. K words: STAR-Be - STARS-POST AGB
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