Seismic probing of the first dredge-up event through the eccentric red-giant and red-giant spectroscopic binary KIC 9163796 - How different are red-giant stars with a mass ratio of ~1.015?

P. G. Beck; T. Kallinger; K. Pavlovski; A. Palacios; A. Tkachenko; S. Mathis; R. A. García; E. Corsaro; C. Johnston; B. Mosser; T. Ceillier; J.-D. do Nascimento; G. Raskin

doi:10.1051/0004-6361/201731269

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Volume 612 (April 2018)

A&A, 612 (2018) A22

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Table 1

Journal of observations and the radial velocities for both components of the system KIC 9163796.

BJD^′	ExpTime	S∕N(Mg)	RV1	RV2
[day]	[s]		[km s⁻¹]	[km s⁻¹]
6388.6218	750	50	−14.70	−8.16
6392.6194	1250	65	−16.41	−4.34
6415.6180	1200	70	−21.06	−0.19
6432.5633	1800	80	−21.62	0.30
6438.7131	600	50	−21.37	0.18
6454.6504	1800	85	−19.12	−2.01
6457.7038	400	40	−18.23	−2.75
6463.4188	600	40	−15.76	−5.47
6469.5667	1800	80	−10.88	−10.88
6472.4185	400	30	−7.35	−12.84
6479.5045	1800	85	13.22	−34.67
6481.4543	1800	90	25.55	−47.66
6483.4543	1800	60	41.33	−63.22
6485.5717	1800	80	48.50	−71.13
6488.4878	1800	75	30.87	−53.19
6506.3947	600	35	−11.92	−11.92
6510.6143	1200	55	−14.93	−7.19
6512.3816	600	40	−15.78	−6.00
6515.5870	600	40	−17.09	−3.88
6524.5240	600	40	−19.54	−1.85
6533.6284	600	40	−20.74	−0.44
6535.4217	600	45	−21.03	−0.41
6542.4943	600	35	−21.54	0.06
6555.4203	600	50	−21.65	0.18
6560.3886	600	50	−21.37	0.02

7170.5893	1800	80	−21.03	−0.13
7198.6549	1050	60	−10.19	−10.19
7239.5499	1800	80	−15.26	−6.40

Notes. The midpoint of the observation in the abbreviated barycentric Julian date (BJD^′ = BJD − 2 450 000.0), exposure times of each individual spectrum, the signal to noise at the échelle order 69, and the derived radial velocities for the high (RV1) and small profile (RV2) in the cross correlation function. We adopt the 2 σ-threshold of 140 m s⁻¹ of the night-to-night stability as the typical uncertainty of the measurement. The horizontal line marks the beginning of the observations in 2015.

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