Technetium-rich M stars: Prime diagnostics of recent third dredge-up events on the asymptotic giant branch

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Table 1.

Stellar parameters and metallicity of selected sample stars.

Star	T_eff	L	log g	[Fe/H]	σ_[Fe/H]	C/O
	(K)	(L_⊙)		(dex)	(dex)
AA Cam	3600	3700 $_{- 100}^{+ 200}$ $^{+200}_{-100}$	1.0	−0.3 (13)	0.13	0.5
OP Her	3500	4200 $_{- 100}^{+ 200}$ $^{+200}_{-100}$	0.0	−0.6 (8)	0.32	0.3
RX Lac	3500	6600 $_{- 600}^{+ 700}$ $^{+700}_{-600}$	0.0	−0.9 (7)	0.16	0.4

Notes. The stellar parameters and abundances of AA Cam are taken from Shetye et al. (2021). Metallicities [Fe/H] are derived obtained from the Fe abundance analyses. Numbers in brackets in the [Fe/H] column indicate the number of lines used to derive [Fe/H], and the next column indicates the standard deviation (derived from the line-to-line scatter) on [Fe/H].

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