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Erika D. Grundstrom, M. V. McSwain, C. Aragona, T. S. Boyajian, A. N. Marsh & R. M. Roettenbacher

Observations of Be Disk Building: Optical Spectra of NW Serpentis (HD 168797) over 35 days

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Abstract

The classical Be star NW Serpentis (HD 168797) is part of the CoRoT field and has long been studied photometrically and is known to have multi-periodic pulsational modes. Such pulsations are thought to be a way to generate the Be equatorial circumstellar disk. In an earlier survey, we identified this star as a possible non-radial pulsator and a known B Be variable. During Fall 2008, we obtained 23 spectra over 35 nights in the Halpha region. During this time, we observed Halpha to go from purely photospheric absorption to double-peaked emission then ”fade” back toward photospheric absorption. We present our determination of stellar parameters, our analysis of the circumstellar disk construction, and the possibility of a binary companion. These observations also suggest that frequent observations of Be stars known to be non-radial pulsators may yield more opportunities to study the disk-building phenomenon and thus assist in constraining theoretical models of disk generation.

To cite this article

Erika D. Grundstrom, M. V. McSwain, C. Aragona, T. S. Boyajian, A. N. Marsh & R. M. Roettenbacher, «Observations of Be Disk Building: Optical Spectra of NW Serpentis (HD 168797) over 35 days», Bulletin de la Société Royale des Sciences de Liège [En ligne], Volume 80 - Année 2011, 371 - 375 URL : https://popups.uliege.be/0037-9565/index.php?id=2839.

About: Erika D. Grundstrom

Dept. of Physics & Astronomy, Vanderbilt University, Nashville, TN, USA, and Dept. of Physics, Fisk University, Nashville, TN, USA

About: M. V. McSwain

Dept. of Physics, Lehigh University, Bethlehem, PA, USA

About: C. Aragona

Dept. of Physics, Lehigh University, Bethlehem, PA, USA

About: T. S. Boyajian

CHARA, Georgia State University, Atlanta, GA, USA

About: A. N. Marsh

Dept. of Physics, Lehigh University, Bethlehem, PA, USA

About: R. M. Roettenbacher

Dept. of Physics, Lehigh University, Bethlehem, PA, USA