2019A&A...628L...1I

Query : 2019A&A...628L...1I

2019A&A...628L...1I - Astronomy and Astrophysics, volume 628, L1-1 (2019/8-1)

Ross 128 - GL 447. A possible activity cycle for a slow-rotating fully convective star.

IBANEZ BUSTOS R.V., BUCCINO A.P., FLORES M. and MAUAS P.J.D.

Abstract (from CDS):

Context. Long-term chromospheric activity in slow-rotating fully convective stars has scarcely been explored. Ross 128 (Gl 447) is a slow-rotator and inactive dM4 star that has been extensively observed.It hosts the fourth closest extrasolar planet.
Aims. Ross 128 is an ideal target to test dynamo theories in slow-rotating low-mass stars.
Methods. To characterize the magnetic activity of Ross 128, we studied the S_K-indexes derived from CASLEO, HARPS, FEROS, UVES, and X-shooter spectra. Using the generalized Lomb-Scargle and CLEAN periodograms, we analyzed the whole S_K time-series obtained between 2004 and 2018. We performed a similar analysis for the NaI-index, and we analyzed its relation with the S_K-index. Results. From both indexes, we obtain a possible activity cycle with a period of about five years, which is one of a small handful of activity cycles that have been reported for a slow-rotating fully convective star.

Abstract Copyright: © ESO 2019

Journal keyword(s): stars: activity - stars: late-type - techniques: spectroscopic

Simbad objects: 14

Full paper

View the references in ADS

Number of rows : 14

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2023	#notes
1	G 268-38	PM*	00 44 59.3309137511	-15 16 17.542839990			14.150	13.801		M4.5	129	0
2	* tau Cet	PM*	01 44 04.0831371922	-15 56 14.927607677	4.43	4.22	3.50	2.88	2.41	G8V	1226	1
3	BD-06 1339	PM*	05 53 00.2846861073	-05 59 41.441196105	12.27	11.041	9.693	8.855	8.099	K7V/M0V	89	1
4	HD 42581	Er*	06 10 34.6149358167	-21 51 52.656352926	10.801	9.607	8.125	7.164	6.121	M1V	462	0
5	CD-45 5627	SB*	09 58 34.3232475127	-46 25 30.406371794	13.77	12.8	11.320	10.133	8.635	M3Ve	90	1
6	V* AD Leo	Er*	10 19 36.2808181226	+19 52 12.010446571		10.82	9.52	9.19		dM3	1296	1
7	Ross 128	Er*	11 47 44.3972681420	+00 48 16.400337591	14.223	12.905	11.153	9.859	8.184	dM4	408	0
8	HD 102590A	PM*	11 48 38.709449	+14 17 03.14849		6.19	5.94			A8V	11	0
9	V* RS CVn	RS*	13 10 36.9077924448	+35 56 05.584994412	8.57	8.51	7.93	7.7		F6IV+G8IV	714	0
10	NAME Proxima Centauri	Er*	14 29 42.9461331854	-62 40 46.164680672	14.21	12.95	11.13	9.45	7.41	M5.5Ve	1242	0
11	NAME Barnard's star	BY*	17 57 48.4984700685	+04 41 36.113879676	12.497	11.24	9.511	8.298	6.741	M4V	794	2
12	HD 180617	PM*	19 16 55.2565688720	+05 10 08.040554168	11.768	10.63	9.115	8.076	6.782	M3-V	408	0
13	HD 197481	BY*	20 45 09.5324974119	-31 20 27.237889841		10.05	8.627	9.078	6.593	M1VeBa1	1099	0
14	TRAPPIST-1	LM*	23 06 29.3684948589	-05 02 29.037301866			18.798	16.466	14.024	M7.5e	892	0

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