Computer Science
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6409p&link_type=abstract
HST Proposal ID #6409
Computer Science
Hst Proposal Id #6409 Hot Stars
Scientific paper
This is a CONTINUATION PROPOSAL (Cycle 5 # 6055), it wasawarded 4 orbits for Cycle 5 and 4 for Cycle 6. We propose tofollow the extraordinary event occurring in the central starof the LMC-PN N66. Before 1987, it showed a weak continuumwith a T_eff >= 120000 K and L_bol ~eq 25000 L_odot and infew years it developed strong WR features (P-Cygni profilesin N V Lambda1240 and C IV Lamnda1550 lines, wide He IIemission, etc.) typical of a WN4.5. The continuum increased bylarge factors and recently it has shown large variability. Thepresent T_eff is ~ 50000 K and its M_V is similar to that of faintPopulation I WR in the LMC. To explain these changes Pe naet al. (1994) proposed that the star is undergoing a ``finalthermal pulse". The ejecta consists of highly H-deficient He-and N-rich material which is most unusual since the known PNewith WR nucleus show He- and C-rich winds. Small aperture HSTobservations are needed to obtain the stellar spectrumwithout contamination of the nebular emission. The Cycle 5 visitwas already performed successfully. We usedthe FOS with a combination of gratings covering the wavelengthrange 1150-4800 A with a resolving power of 1300.The data is being analyzing to determine the present stellarparameters (mass loss, T_eff, L_bol) and thechemical composition of the wind by means of specificallydeveloped atmosphere models. The star is undergoing dramaticchanges in a timescale of months (it faded two magnitudes inSept. 95
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