Establishing an observational baseline for the newly discovered peculiar variable in Monoceros

Details Establishing an observational baseline for the newly discovered peculiar variable in Monoceros Establishing an observational baseline for the newly discovered peculiar variable in Monoceros

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9576r&link_type=abstract

HST Proposal ID #9576

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Hst Proposal Id #9576

Scientific paper

We propose UV spectroscopy using STIS of a newly discovered {Jan 6th} peculiar variable in Monoceros in order to determine its spectral class and the physical parameters of the star. This will establish a baseline for monitoring the future evolution of this object. Low resolution spectra of this possible nova of 10th mag were obtained on Jan 8th and 9th and exhibit a reddened continuum plus a wealth of absorption features and four prominent emission lines exhibiting P-Cyg profiles. Three of these can be identified with Ba II {multiplet 2} at 5855, 6142, and 6497A. In addition, strong Na I 5897A and weak Halpha emission {equivalent width 1A, FWHM 200 km/sec} are present and exhibit P-Cyg profiles. Other features include many absorption lines of Fe II in the region 5000-5600A, O I 7774A, and Ca II 8598, 8542A. Evidently the spectrum is highly unusual for a nova. The mere existence of Ba emission lines tells us that this is a very special but highly evolved star and the object has been suggested to be a peculiar slow nova or a post-AGB star which has just suffered a final helium flash. Thus, it might be similar to Sakurai's object. It would then offer the unique opportunity to observe the very early phases of a final helium flash, something which could not be achieved in the case of Sakurai's object.

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