Monitoring Hα Emission and Continuum in RR Tauri with Narrowband Filters

Details Monitoring Hα Emission and Continuum in RR Tauri with Narrowband Filters Monitoring Hα Emission and Continuum in RR Tauri with Narrowband Filters

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21734027v&link_type=abstract

American Astronomical Society, AAS Meeting #217, #340.27; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the first results of monitoring of the UXOR RR Tau with narrowband (45-100 Å) interference filters, augmented with the traditional broad-band filters. The applied method allows us to separate the variations of the emission line (Hα) and surrounding continuum. For stars as bright as RR Tau, with the equivalent width of Hα emission > 10Å, the typical 1σ error of the extracted emission intensity is <10%. Although the observed light curves do not exclude some correlations between the Hα emission and the continuum, the amplitude of the variations in the former is several times smaller. Furthermore, there were periods where continuum changed considerably but the emission line remained constant within the error margin. We conclude that the region responsible for Hα emission and the source of continuum in RR Tau are widely separated. Our results are in good agreement with the model proposed by Grinin (1988), where the deep irregular dimming of an UXOR’s continuum is due to its occultation by gas/dust cloudlets that are comparable in size to the star but much smaller than the region of Hα emission. We also come to the preliminary conclusion that the extracted Hα emission light curve may reveal the intrinsic (not connected with the cloud obscuration) variations of the star. This project was supported by the NSF/REU grant AST-0851892 and the Nantucket Maria Mitchell Association.

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