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Title:
Spectroscopic Wonders During The 2010 Eclipse Of Epsilon Aurigae
Authors:
Leadbeater, Robin; Buil, C.; Garrell, T.; Gorodenski, S.; Hopkins, J.; Mauclaire, B.; Ribeiro, J.; Schanne, L.; Thizy, O.; Stencel, R.
Affiliation:
AA(Three Hills Observatory), AB(Castanet Tolosan Observatory, France), AC(Observatoire de Foncaude, France), AD(Blue Hills Observatory), AE(Hopkins Phoenix Observatory), AF(Observatoire du Val de l'Arc, France), AG(Observatorio de Instituto Geografico de Exercito, Portugal), AH(Voelklingen Observatory, Germany), AI(Shelyak Instruments, France), AJ(University of Denver)
Publication:
American Astronomical Society, AAS Meeting #217, id.257.04; Bulletin of the American Astronomical Society, Vol. 43, 2011
Publication Date:
01/2011
Origin:
AAS
Abstract Copyright:
(c) 2011: American Astronomical Society
Bibliographic Code:
2011AAS...21725704L

Abstract

Remarkable spectroscopic coverage is reported of the 2009-2011 eclipse of the enigmatic binary, epsilon Aurigae. Due to the availability of new spectrographs and digital detectors, unprecedented monitoring by a network of observers using small telescopes has revealed a number of details and surprises that must be taken into account in any updated model for the over-luminous F star and the dark disk companion, recently detected interferometrically. Over 400 spectra were obtained during 2007 to 2010 (pre eclipse to post mid eclipse). They include R 12000 echelle spectra giving broad coverage from 4300-7000A and detailed spectra at R 17000-25000 covering the Sodium D, Hydrogen alpha and Potassium 7699A line regions. Evidence of the eclipsing body was first seen in the 7699A line profile 83 days before photometric first contact. During ingress, the strength of this line increased in a stepwise fashion suggesting structure in the disc. During the first half of totality, the line strength trend deviated from that seen during the last eclipse. Radial velocity measurements of the 7699A line during ingress are consistent with the disc material orbiting a central object of 5.3 solar masses. Changes in the Hydrogen alpha line profile during totality reveal the presence of a foreground emission source centered at the systemic radial velocity. A small transient emission line has been seen at 6604A on two occasions during the eclipse. This work was supported in part by the bequest of William Herschel Womble in support of astronomy at the University of Denver, and by NSF grant 1016678 to the University of Denver. We are grateful for the assistance of the epsilon Aurigae spectral monitoring team at Apache Point Observatory (W. Ketzeback, J.Barentine, et al.) and all observers participating in the international eclipse monitoring campaign.
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