AAS 203rd Meeting, January 2004
Session 83 Stars Variable in Light
Poster, Wednesday, January 7, 2004, 9:20am-6:30pm, Grand Hall

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[83.10] Frequency Identification in Light Variations of the Lambda Bootis star HD111604

S. M. Sonnett, R. J. Dukes (Coll. Charleston)

Bohlender, et. al. (Astron. Astrophys. 307, L9-12,1996) have found evidence of non-radial pulsation in the line profile variations of the Lambda Bootis Star HD 111604. At their request, we put this on the observing program of the Four College Consortium Automatic Photometric Telescope. In a preliminary report, (Jordan, J., Dukes R. J., Jr., and Adelman, S. 1997, BAAS, 29, 1275) found that the star was probably variable with a period of approximately 0.1 days. In this paper, we report on a more extensive analysis of approximately 570 Stromgren uvby observations obtained on ten nights during the 1997-98 and 1998-99 observing seasons. While our data spacing is atrocious, leading to great aliasing problems and the u and v data noisy analysis of the b and y data, in this data we have identified two periods. We report f1 = 5.33 c/d and f2 = 12.62 c/d although our values should be regarded as tentative. There is still much power in the residuals in the range of 9 - 13 c/d, implying that there may be additional periodicities. There is also some indication that the amplitudes of f1 and f2 may be variable. Finally, we assert that a very rapid variable such as HD111604 is not an ideal target for a shared automatic telescope, making it a possible target for a multi-longitude campaign.

This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France and has been funded by NSF Grants #AST95-28906 and #AST-0071260 to the College of Charleston.

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The author(s) of this abstract have provided an email address for comments about the abstract: sarsonnett@aol.com

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