SIMBAD references

1998A&A...330..169D - Astronomy and Astrophysics, volume 330, 169-174 (1998/2-1)

Detection of short-term variations in Mira-type variables from Hipparcos photometry.

DE LAVERNY P., MENNESSIER M.O., MIGNARD F. and MATTEI J.A.

Abstract (from CDS):

The Hipparcos photometric observations carried out over 37 months have been investigated in detail for ∼250 Miras. This leads to an unexpected by-product of the mission that we already suspected from ESOC real-time reductions: the first detection from space of photometric short-term brightness variations in Mira-type variables. Altogether, 51 events in 39 M-type Miras are detected and no similar variations are found for S and C-type Miras. Their amplitude ranges from 0.23 mag up to 1.11 mag and their duration extends from 2 hours up to almost 6 days. These events seem to occur preferentially in late spectral types. We suggest that they might be related to molecular opacity effects.

Abstract Copyright:

Journal keyword(s): stars: variables - stars: late-type - stars: AGB and post-AGB

Simbad objects: 42

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