Computer Science
Scientific paper
Oct 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aan...410....1t&link_type=abstract
AAVSO Alert Notice 410
Computer Science
Epsilon Aur, Eclipsing Binary
Scientific paper
Dr. Robert Stencel (Denver U.) requests enhanced coverage of the bright, long-period eclipsing binary star epsilon Aurigae through Wednesday. Observations are requested beginning immediately (October 29, 2009; JD 2455134) and continuing through November 5, 2009 (JD 2455141). This request is in conjunction with scheduled observations with the CHARA optical interferometer at Mount Wilson in California. Optical photometry by a number of observers will provide a continuous photometric baseline of epsilon Aurigae during the course of the interferometry, enabling Stencel and collaborators to more easily interpret the interferometric images. These interferometric observations are being made to image the system as it enters eclipse; the optical interferometric observations being made by CHARA are completely analogous to those made with radio interferometers like the Very Large Array, and allow ground based observers to obtain images with far higher resolution than a single optical telescope is capable of. The CHARA observations are scheduled for the nights of November 1, 2, and 3 (through mid-day UT on November 4, 2009). All observations, including visual estimates, DSLR and CCD photometry, and photoelectric photometry, are encouraged. The observations are part of a larger, long-term collaborative effort to study epsilon Aurigae. For more information on epsilon Aurigae, see the Citizen Sky website http://www.citizensky.org/. Epsilon Aurigae is currently in the ingress phase of the eclipse, which likely began in August of 2009. The star is now near V ~ 3.4 and declining. The nature of the eclipsing object is not known, but is likely to be an opaque disk surrounding an unseen, massive secondary star or binary pair. Interferometric images of epsilon Aurigae may yield strong constraints on the shape of the eclipsing!
disk and size of the system. Observations should be reported to the AAVSO International Database as EPS AUR.
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