Monitoring Spectral Variability of a Candidate UXOR with Interference Filters

Details Monitoring Spectral Variability of a Candidate UXOR with Interference Filters Monitoring Spectral Variability of a Candidate UXOR with Interference Filters

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21341407w&link_type=abstract

American Astronomical Society, AAS Meeting #213, #414.07; Bulletin of the American Astronomical Society, Vol. 41, p.224

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present the first results of interference filter monitoring of the UXOR candidate V3798 Sgr. UXORs are Herbig AeBe stars exhibiting deep irregular drops in continuum brightness, probably due to small circumstellar dust cloudlets occulting the star. Sparse spectral monitoring of UXORs reveals an uncorrelated variability of their continuum and hydrogen emission lines (Rodgers B. et al. 2002), which suggests that the emission lines originate from a large circumstellar envelope whose emission is unaffected by the smaller cloudlets responsible for the sporadic dimming. Our method consists of comparing the fluxes in two 100 Å wide interference filters centered at 6563Å (Hα) and 6450Å (adjacent continuum). Under the assumption that dust obscuration is responsible for star's dimming, this method enables the separation of the Hα emission line flux from that of the photospheric continuum, and an investigation of the correlation between them. We monitored V3798 Sgr closely in the summer and fall of 2008. Despite the relative weakness of the Hα line in this star and the resulting errors in the extracted values of the line emission flux, our observations reveal a lack of correlation between the variations of the Hα flux and the more pronounced variations of the continuum during episodes of sporadic dimming. This, together with previously established properties of the star (sporadic dimming; lack of periodicity; possible "bluing” effect in the deep minima), supports its identification as a new UXOR. We will also discuss possible intrinsic (i.e. not caused by the sporadic dust obscuration) variability of the star revealed in this monitoring. This project was supported by the NSF/REU grant AST-0354056 and the Nantucket Maria Mitchell Association.

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