Table 1: Spectral type, visual apparent magnitudes, colour indices, number of exposures ( N), and mean resulting signal-to-noise ratios (at $\lambda \approx$ 6000 Å) for the program stars. The spectral types, magnitudes and colour indices are from the SIMBAD database.
Star Spectral V B-V N S/N

type (mag) (mag)

HD 23249 ( $\delta$ Eri) K0 IV 3.50 0.93 2 350

HD 198149 ( $\eta$ Cep) K0 IV 3.41 0.94 1 360

HD 222404 ( $\gamma$ Cep) K1 IV 3.23 1.03 2 320

HD 10780 K0 V 5.63 0.81 2 240

HD 4628 K2 V 5.75 0.88 2 210

HD 201091 (61 Cyg A) K5 V 5.21 1.18 2 200

**Table 1:** Spectral type, visual apparent magnitudes, colour indices, number of exposures ( N), and mean resulting signal-to-noise ratios (at $\lambda \approx$ 6000 Å) for the program stars. The spectral types, magnitudes and colour indices are from the SIMBAD database.
Star	Spectral	V	B-V	N	S/N
	type	(mag)	(mag)
HD 23249 ( $\delta$ Eri)	K0 IV	3.50	0.93	2	350
HD 198149 ( $\eta$ Cep)	K0 IV	3.41	0.94	1	360
HD 222404 ( $\gamma$ Cep)	K1 IV	3.23	1.03	2	320
HD 10780	K0 V	5.63	0.81	2	240
HD 4628	K2 V	5.75	0.88	2	210
HD 201091 (61 Cyg A)	K5 V	5.21	1.18	2	200

Source LaTeX | All tables | In the text

	1 Introduction
	2 Observations and data reduction
	3 Data analysis: Methods
	4 Results and discussion
	5 Conclusions
	References
	Online Material