Cepheids with giant companions - II. Spectroscopic confirmation of nine new double-lined binary systems composed of two Cepheids

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Volume 686 (June 2024)

A&A, 686 (2024) A263

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Table 1.

Basic data for known double Cepheids.


		Component A		Component B
OGLE ID	Modes	P₁ [days]	$P_{1}^{F}$ [days]	P₂ [days]	$P_{2}^{F}$ [days]	$P_{2}^{F} / P_{1}^{F}$	V [mag]	I [mag]	Refs.
BLG-CEP-067	1O + 1O	2.610721	3.827	1.692381	2.444	0.639	16.33	14.51	(3)
GD-CEP-0291	F + F	3.667693	3.668	3.398977	3.399	0.927	14.65	12.70	(3)
LMC-CEP-0571	F + 1O	3.079937	3.080	2.100885	3.057	0.992	15.70	14.86	(1), (2)
LMC-CEP-0835	F + F	4.562781	4.563	2.750956	2.751	0.603	15.25	14.46	(1), (2)
LMC-CEP-1718	1O + 1O	2.480909	3.649	1.963683	2.869	0.786	15.19	14.51	(1), (2), (4)
SMC-CEP-1526	F + F	1.804311	1.804	1.290234	1.290	0.715	16.83	16.16	(2)
SMC-CEP-2699	1O + F	2.562225	3.772	2.117341	2.117	0.561	16.06	15.38	(2)
SMC-CEP-2893	F + F	1.321549	1.321	1.135859	1.136	0.860	16.93	16.38	(2)
SMC-CEP-3115	F + F	1.251945	1.252	1.159784	1.160	0.926	16.66	16.18	(2)
SMC-CEP-3674	F + 1O	2.896089	2.896	1.827785	2.665	0.920	15.79	15.13	(2)

Notes. Period (P_i) and fundamentalized period ( $P_{i}^{F}$ ) are given for each component (i = 1, 2) of a given double Cepheid. LMC-CEP-1718 is the only one already spectroscopically confirmed. References are given in the last column.

References. (1) Alcock et al. (1995), (2) Soszyński et al. (2017), (3) Udalski et al. (2018), (4) Pilecki et al. (2018).

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