Spectroscopic binaries among Hipparcos M giants - I. Data, orbits, and intrinsic variations

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Table 5:

Properties of the 11 M giants detected as X-ray sources by the ROSAT all-sky survey (following Hünsch et al. 1998), where for three stars, the X-ray source is offset by more than 1 $^\prime$ from the M giant optical position.
HR	HD	Name	Sp. Typ.	Binary?
750	16 058	15 Tri	M3 III	SB
2216	42 995	$\eta$ Gem	M3 III	ORB + visual GV comp.
3013	62 898	$\pi$ Gem	M1 III	X-ray offset
4765	108 907	4 Dra	M4 III	ORB
5512	130 144	-	M5 IIIab	Vr constant?
5589	132 813	RR UMi	M4.5 III	ORB - X-ray offset
6200	150 450	42 Her	M2.5 IIIab
6374	155 035	-	M1-2 III	X-ray offset
6406	156 014	$\alpha^1$ Her	M5 Ib-II	visual GV companion
7547	187 372	-	M1 III	ORB
8992	222 800	R Aqr	M7 IIIpe	SB (symbiotic)

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