Fig. 2
Evolution of the near infrared diameter of Betelgeuse over the past two decades. The IRMA measurement comes from Dyck et al. (1992), IOTA from Perrin et al. (2004) in K-band and Haubois et al. (2009) in H-band, the two AMBER high-resolution K-band measurements from Ohnaka et al. (2009, 2011), the AMBER K-medium resolution and broadband from Montargès et al. (2014) and the PIONIER H-band measurements are from the present work.
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