2018A&A...619A..98H

Query : 2018A&A...619A..98H

2018A&A...619A..98H - Astronomy and Astrophysics, volume 619A, 98-98 (2018/11-1)

The Kepler view of magnetic chemically peculiar stars.

HUMMERICH S., MIKULASEK Z., PAUNZEN E., BERNHARD K., JANIK J., YAKUNIN I.A., PRIBULLA T., VANKO M. and MATECHOVA L.

Abstract (from CDS):

Context. Magnetic chemically peculiar (mCP) stars exhibit complex atmospheres that allow the investigation of such diverse phenomena as atomic diffusion, magnetic fields, and stellar rotation. The advent of space-based photometry provides the opportunity for the first precise characterizations of the photometric variability properties of these stars, which might advance our understanding of the processes involved and the atmospheric structures of mCP stars.
Aims. We carried out a search for new mCP stars in the Kepler field with the ultimate aim of investigating their photometric variability properties using Kepler data. As an aside, we describe criteria for selecting mCP star candidates based on light curve properties, and assess the accuracy of the spectral classifications provided by the MKCLASS code.
Methods. As only very few known mCP stars are situated in the Kepler field, we had to depend largely on alternative (non-spectroscopic) means of identifying suitable candidates that rely mostly on light curve properties; in particular we relied on monoperiodic variability and light curve stability. Newly acquired and archival spectra were used to confirm most of our mCP star candidates. Linear ephemeris parameters and effective amplitudes were derived from detrended Kepler data.
Results. Our final sample consists of 41 spectroscopically confirmed mCP stars of which 39 are new discoveries, 5 candidate mCP stars, and 7 stars in which no chemical peculiarities could be established. Our targets populate the whole age range from zero-age main sequence to terminal-age main sequence and are distributed in the mass interval from 1.5M_☉ to 4M_☉. About 25% of the mCP stars show a hitherto unobserved wealth of detail in their light curves indicative of complex surface structures. We identified light curve stability as a primary criterion for identifying mCP star candidates among early-type stars in large photometric surveys, and prove the reliability of the spectral classifications provided by the MKCLASS code.

Abstract Copyright: © ESO 2018

Journal keyword(s): stars: chemically peculiar - stars: abundances - stars: atmospheres - stars: rotation - stars: variables: general

Simbad objects: 70

Full paper

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Number of rows : 70

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2024	#notes
1	* 48 Cet	PM*	01 29 36.1356921336	-21 37 45.609971844		5.126	5.104			A0V	84	0
2	V* HZ Aur	a2*	05 06 08.3584818960	+33 55 07.279039380		7.03	7.07			B9p	185	0
3	HD 41641	dS*	06 06 40.5782639808	+06 43 49.884406824		8.14	7.86			A5III	28	0
4	* 49 Cam	a2*	07 46 27.4146675768	+62 49 49.882910592		6.750	6.458			A7VpSrCrEuSiKsn	138	0
5	* 53 Cam	a2*	08 01 42.4403874648	+60 19 27.806833200		6.177	6.008			A3VpSrSiCrEu	398	0
6	* lam Boo	dS*	14 16 23.0184083839	+46 05 17.895459693	4.31	4.26	4.18	4.16	4.13	A0Va_lB	347	0
7	* bet CrB	a2*	15 27 49.7315305	+29 06 20.522375	4.08	3.97	3.68	3.50	3.45	F2VpSrCrEuSi	684	0
8	NGC 6618	OpC	18 20 47	-16 10.3						~	1596	0
9	* alf Lyr	dS*	18 36 56.33635	+38 47 01.2802	0.03	0.03	0.03	0.07	0.10	A0Va	2668	1
10	UCAC4 693-063535	*	18 48 18.4245378528	+48 28 54.046567128		13.146	13.146	13.279		~	2	0
11	HD 175132	*	18 52 07.2499320864	+41 22 59.680929396		6.187	6.269			B9IIIpSi	56	0
12	2MASS J18544461+4820247	EB*	18 54 44.6226138360	+48 20 24.795847140						A2Vp	17	0
13	HD 176436	Ro*	18 58 02.3892500664	+47 25 10.870210560		8.23	8.21			B9	8	0
14	TYC 3131-1074-1	Pe*	18 58 21.2930233152	+43 49 26.414681952		11.72	11.61			A8III	7	0
15	TYC 3131-1445-1	Ro*	18 58 29.9055001344	+44 29 34.983790116		11.15	10.99			B9III	7	0
16	HD 176582	Er*	18 59 12.2918170752	+39 13 02.360908524	5.52	6.248	6.403			B5V	98	0
17	HD 177152	Ro*	19 01 21.7811743752	+44 23 11.470012044		7.54	7.57			B9V	32	0
18	2MASS J19012670+5023067	Pe*	19 01 26.7107079600	+50 23 06.678727188						A0VSi	5	0
19	HD 177128	Pe*	19 01 32.4908813424	+41 51 59.328242424		9.31	9.11			A2Vp	13	0
20	TYC 3120-750-1	Ro*	19 02 54.7381080792	+38 09 57.482546220		11.74	11.53			A2IV	6	0
21	TYC 3124-443-1	Pe*	19 04 20.2794725352	+41 01 45.085115748		12.42	11.65			A7V	9	0
22	2MASS J19061861+3824209	Ro*	19 06 18.6132042576	+38 24 20.867752872						~	6	0
23	BD+44 3063	gD*	19 06 27.5519195736	+44 50 33.430309584		10.60	10.19			A9V	28	0
24	TYC 3550-977-1	Pe*	19 13 05.8025867952	+50 00 13.395987216		11.88	11.82			A2Vp	10	0
25	TYC 3121-127-1	Pe*	19 16 08.9501281656	+39 00 25.051134456		12.17	11.86			A1IV-VSrSiEu	8	0
26	TYC 3125-287-1	Pe*	19 18 25.7242745688	+39 55 56.973274968		12.39	12.58			B8III	8	0
27	HD 181436	Ro*	19 18 36.0927351000	+41 36 43.382813472		8.64	8.67			B9	12	0
28	TYC 3547-2631-1	Er*	19 19 05.0176884456	+48 27 52.495550280		11.52	11.37			A5V	9	0
29	TYC 3133-70-1	Pe*	19 19 20.1771503568	+44 47 06.708499620		11.60	11.45			B6III	11	0
30	V* V694 Lyr	V*	19 20 30.7975117080	+37 50 55.028672988			14.210		13.830	~	5	0
31	NGC 6791	OpC	19 20 53.0	+37 46 41		10.52	9.5			~	1023	0
32	BD+43 3223	Pe*	19 21 35.1532365192	+44 03 02.271597840		10.40	10.41		10.349	A0II-IIISrSiEu	17	0
33	TYC 3543-971-1	Ro*	19 21 51.3532726848	+45 06 55.314426312		12.32	11.56			B8IVSi	8	0
34	2MASS J19224722+4419143	Pu*	19 22 47.2320537768	+44 19 14.275786944						~	5	0
35	TYC 2666-873-1	Pe*	19 23 13.4094405840	+37 22 24.378171708		10.45	10.46			B8II-III	10	0
36	TYC 3134-1731-1	SB*	19 24 16.2266603880	+37 47 48.906160872		10.60	10.24			kA1hA4mA8Si	3	0
37	HD 182895	dS*	19 24 48.4740546888	+45 20 48.910944120		9.24	8.86			Am	21	0
38	2MASS J19263017+3802518	Pe*	19 26 30.1734706512	+38 02 51.729640044						B9VSi	8	0
39	TYC 2666-407-1	Pe*	19 27 55.1947968168	+37 10 32.180340864		11.33	11.36			A5V	9	0
40	TYC 3142-25-1	dS*	19 28 49.3035604176	+41 35 50.204122260		10.70	10.62			B9.5Vn	10	0
41	BD+42 3356	Pu*	19 29 04.1146949136	+42 19 16.633998516		9.96	9.97			B9IV	13	0
42	2MASS J19294376+4229306	Pe*	19 29 43.7727362856	+42 29 30.680392812						B9IV	7	0
43	HD 184007	Ro*	19 29 55.2975822	+49 30 31.723160				8.82		B9	16	0
44	HD 185330	*	19 36 56.6493724800	+38 23 01.768931556	5.72	6.368	6.500			B5II-III	67	0
45	2MASS J19391258+4701085	Ro*	19 39 12.5785854504	+47 01 08.509798164						B9.5Vn	13	0
46	BD+46 2748	Pe*	19 39 27.5867231424	+47 18 26.456821056		10.37	10.38		10.285	B9VSi	14	0
47	KOI-7395	Pu*	19 39 36.7116143904	+48 28 38.007657408		11.80	11.40			A2Vp	12	0
48	2MASS J19420663+4438592	Ro*	19 42 06.6391272264	+44 38 59.260598808						A1V	5	0
49	TYC 3136-717-1	Pe*	19 42 08.1498850488	+38 41 37.906644948		11.77	11.97			B9.5VSi	7	0
50	TYC 3565-655-1	Ro*	19 45 27.8397900888	+49 46 30.767965428		11.11	11.00			A9V	7	0
51	TYC 3565-508-1	Pu*	19 45 38.8206467136	+49 22 27.880771080		12.32	12.27			~	9	0
52	2MASS J19491098+4138090	Ro*	19 49 10.9765251024	+41 38 09.087387972						~	6	0
53	TYC 3148-183-1	Pe*	19 49 36.2418054936	+43 13 08.288103504		11.72	11.48			A7III	6	0
54	KOI-7190	Pu*	19 49 37.0141846368	+46 07 11.954197848		11.91	12.00			~	7	0
55	TYC 3561-1322-1	Ro*	19 49 38.8868434152	+47 42 11.706188796		12.27	12.39			~	5	0
56	2MASS J19501553+4058357	Ro*	19 50 15.5288836608	+40 58 35.676583932						A9V	5	0
57	2MASS J19511198+4206264	Pu*	19 51 11.9859318840	+42 06 26.355609756						A2III	5	0
58	KOI-6136	Pe*	19 51 20.3829691536	+41 03 29.951012124		11.71	11.32			A1III-IVSrSiEu	9	0
59	HD 188101	Er*	19 51 50.9985963768	+41 20 55.676022720		7.66	7.74			B9	18	0
60	UCAC4 652-079468	EB*	19 52 31.1799084072	+40 23 59.478954072		13.443	13.064	13.153		A1V	11	0
61	TYC 3562-258-1	Ro*	19 52 31.7974794216	+48 40 38.401679712		12.06	12.05			~	5	0
62	HD 226339	Pe*	19 52 51.0765055224	+40 36 21.475962648		10.84	10.86			B8VSi	13	0
63	2MASS J19531426+4457124	Pe*	19 53 14.2623937512	+44 57 12.403687320						B9.5IV-VSi	8	0
64	HD 226421	Pe*	19 53 44.3227707144	+41 41 04.259586948		10.193	10.21			B8p	14	0
65	KOI-7362	Ro*	19 54 17.1807385008	+47 57 50.186424456						A9V	9	0
66	KOI-7414	Pe*	19 54 35.2373178816	+48 47 04.651825308		12.33	12.52			A0VSi	9	0
67	V* V2094 Cyg	EB*	19 55 12.0485430576	+46 39 56.023332588		7.96	7.62			A7pCrEu	68	1
68	TYC 3149-1303-1	Pe*	19 56 44.9580572544	+43 29 51.421306056		11.71	11.65			B9VSi	11	0
69	V* V2095 Cyg	a2*	19 56 50.1551656776	+44 16 16.046775912		7.88	7.90			B9pSiCr	55	0
70	2MASS J19591596+4056166	Pu*	19 59 15.9659253120	+40 56 16.574312256						~	6	0

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