TITLE:
Distances Scale Determination for a Planetary Nebula in Galactic Bulge
AUTHORS:
Sundus A. Abdullah, Nathera A. Ali, Mohamed A. Sallih
KEYWORDS:
Planetary Nebulae; Masses; Distances Planetary Nebulae
JOURNAL NAME:
International Journal of Astronomy and Astrophysics,
Vol.3 No.2,
May
31,
2013
ABSTRACT: Planetary Nebulae (PN)
distances represent the fundamental parameter for the determination the
physical properties of the central star of PN. In this paper the distances
scale to Planetary Nebulae in the Galactic bulge were calculated related
to previous distances scales. The proposed distance scale was done by
recalibrated the previous distance scale technique CKS/D82. This scale limited
for nearby PN (D ≤ 3.5 kpc), so the
surface fluxes less than other distance scales. With these criteria the results
showed that the proposed distance scale is more accurate than other scales
related to the observations for adopted sample of PN distances, also the limit
of ionized radius (Rio) for all both optically thick and optically thin in the rang of sizes (0.45
> Rio (pc) > 0.03).