Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21734015b&link_type=abstract
American Astronomical Society, AAS Meeting #217, #340.15; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
KK Oph is a double star consisting of an UXOR and its fainter T Tauri companion, separated by 1.6 arcsecs. The goal of this project was to monitor the variability of the combined source in continuum radiation and Hα emission. We used two or three narrow-band interference filters centered on 6563 Å (Hα) and 6450 Å (adjacent continuum) to measure the intensity of the Hα emission separately from that of the continuum. The method of separation is presented along with the results of 3-months monitoring, which included monitoring in the traditional broad-band (BVI) filters. CCD photometry was done with the 24” Ritchey-Chrétien telescope
of the Maria Mitchell Observatory.
Our results indicate that the Hα emission of the combined source remains virtually constant or changes only slightly (by less than 20%) while the continuum varies by as much as a factor of 2. There may be some correlation between Hα emission and continuum at times of perceptible Hα variation. We argue that this continuum variation is primarily due to the UXOR. Our results support similar observations of the UXOR RR Tau (Rodgers et al. 2002; Bedell et al. 2010; Villaume et al, this meeting) and provide evidence that the source of Hα emission in UXORs is considerably larger than the source of continuum and that they are widely physically separated, in accordance with the “obscuration model” of UXOR variability (Grinin 1988).
This project was supported by the NSF/REU grant AST-0851892 and the Nantucket Maria Mitchell Association.
Bedell Megan
Strelnitski Vladimir
Villaume Alain
Walker Gabrielle
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