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Measurements of the changes in angular diameter of Mira variables with pulsation phase

  • J. S. Young (a1), J. E. Baldwin (a1), R. C. Boysen (a1), C. A. Haniff (a1), D. Pearson (a1), J. Rogers (a1), D. St-Jacques (a1), P. J. Warner (a1) and D. M. A. Wilson (a1)...

Abstract

We report the direct detection of cyclic diameter variations in the Mira variable χ Cygni. Interferometric observations made between 1997 July and 1998 September, using the Cambridge Optical Aperture Synthesis Telescope (COAST) indicate periodic changes in the apparent angular diameter with amplitude 45 per-cent of the smallest value.

The measurements were made in a 50 nm bandpass centred on 905 nm, which is only moderately contaminated by molecular absorption features. To assess the effects of atmospheric stratification on the apparent diameter measured in this band, we have also measured near-infrared diameters for a sample of five Miras, in both the J-band (1.3 μm) and Wing's (1971) 1.04 μm band, which is expected to isolate essentially pure continuum emission. We present J-band visibility curves which indicate that the intensity profiles of the stars in the sample differ greatly from each other.

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References

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Baldwin, J.E., et al., 1998, Proc. SPIE 3350, 736
Burns, D., et al., 1997, MNRAS 290, L11
Burns, D., et al., 1998, MNRAS 297, 462 (B98)
Haniff, C.A., Scholz, M., Tuthill, P.G., 1995, MNRAS 276, 640
Hofmann, K.-H., Scholz, M., Wood, P.R., 1998, A&A 339, 846
Pickles, A.J., 1998, PASP 110, 863
Spinrad, H., Wing, R.F., 1969, ARA&A 7, 249
Tuthill, P.G., Haniff, C.A., Baldwin, J.E., Feast, M.W., 1994, MNRAS 266, 745
Tuthill, P.G., Haniff, C.A., Baldwin, J.E., 1995, MNRAS 277, 1541
van Belle, G.T., Dyck, H.M., Benson, J.A., Lacasse, M.G., 1996, AJ 112, 2147
Wing, R.F., Rinsland, C.P., 1981, Rev. Mexicana Astron. Astrof. 6, 145
Wing, R.F., 1971, in Proc. Conf. on Late-Type Stars (Kitt Peak Natl. Obser. Contr. No. 554), Lockwood, G.W. and Dyck, H.M. (eds.), p. 145

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