A multiyear photopolarimetric study of the semi-regular variable V CVn and identification of analog sources

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Volume 677 (September 2023)

A&A, 677 (2023) A96

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Table A.1

V CVn-type stars: Semi-regular variables with significant variable polarization.

	V CVn	UZ Ari	AK Peg	RX Boo	Z UMa	L₂ Pup
Spectral Type¹	M4e-M6eIIIa	M8	M4-M8e	M6.5e-M8IIIe	M5IIIe	M5ĲIe-M6IIIe
Galactic latitude (º)	70	−31	−43	69	57	−15
Period (d)¹	194	163	194	162	195	–
Amag(V)¹	2.0	0.8	1.6	2.7	3.2	3.6
Polarimetric data (yr)	1966² – 2022²	1972³/2013⁴	1967⁵	1967⁵, 1970⁶	1966⁷, 1970⁶	1967⁸ – 1982⁹
Polarization (%)¹⁰	0.3 – 6.9	2 – 3.5	1.3 – 3.3	0.4 – 1.9	0.2 – 1.8	0 – 8
Postion angle (º)¹¹	80 – 120	126 – 132	21 – 50	40 – 153	8 – 132	165 – 180
Stability in ΔPA¹²	yes	yes	unknown	unknown	unknown	yes
Distance (pc)¹³	501	539	1329	156	296	56
µ (mas yr⁻¹)¹³	40	23	45	53	12	340
V_t (km s⁻¹)¹³	95	59	28	39	17	90
V_r (km s⁻¹)¹³	−47	n.a.	−4	−9	−53	53

¹ General catalog of variable stars (Samus et al. 2017).

² Kruszewski et al. (1968), Dyck & Jennings (1971), Serkowski & Shawl (2001), Davidson et al. (2014), and this study.

³ Kruszewski & Coyne (1976).

⁴ Baug et al. (2014).

⁵ R.A. Vartanyan, Intrinsic Polarization of Stellar Light From RX Boo, AB Cyg, Astrofyzika, 1968.

⁶ Dyck & Jennings (1971).

⁷ Serkowski (1966).

⁸ Kruszewski et al. (1968).

⁹ Magalhaes et al. (1986a).

¹⁰ Range of measured polarization in the V band as published in the above-mentioned studies (RX Boo: intrinsic P).

¹¹ Range of measured polarization angles in the V band as published in the above-mentioned studies.

¹² Yes, if position angle remains constant over the period of available polarization data.

¹³ Gaia Collaboration (2020).

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