**Table 1:** Star sample.
Name	Type	RA (J2000)	Dec (J2000)	Distance	Period	$V_{\rm rad}$	Peak flux
		( $^{\rm h}~^{\rm m}~^{\rm s}$ )	( $^{\circ}~{'}~{''}$ )	(pc)	(days)	(km s^-1)	(Jy)
VX Sgr	Supergiant	18 08 04.0485	-22 13 26.614	1700^a	732	5.3	43.2
U Her	Mira	16 25 47.4713	+18 53 32.867	277^b	406	-14.5	9.75
U Ori	Mira	05 55 49.1689	+20 10 30.687	300^c	368	-38.1	6.44
R Cas	Mira	23 58 24.8725	+51 23 19.703	176^b	430	26.0	-

$\textstyle \parbox{13.5cm}{ $^a$\space \citet{M96}; $^b$\citet{V03}; $^c$\citet{KY98}.}$

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