2015A&A...576A..44K

Query : 2015A&A...576A..44K

2015A&A...576A..44K - Astronomy and Astrophysics, volume 576A44-44 (2015/4-1)

Hot subdwarf binaries from the MUCHFUSS project. Analysis of 12 new systems and a study of the short-period binary population.

KUPFER T., GEIER S., HEBER U., OSTENSEN R.H., BARLOW B.N., MAXTED P.F.L., HEUSER C., SCHAFFENROTH V. and GAENSICKE B.T.

Abstract (from CDS):

The project Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS (MUCHFUSS) aims at finding hot subdwarf stars with massive compact companions like massive white dwarfs (M>1.0M_☉), neutron stars, or stellar-mass black holes. The existence of such systems is predicted by binary evolution theory, and recent discoveries indicate that they exist in our Galaxy. We present orbital and atmospheric parameters and put constraints on the nature of the companions of 12 close hot subdwarf B star (sdB) binaries found in the course of the MUCHFUSS project. The systems show periods between 0.14 and 7.4days. In nine cases the nature of the companions cannot be constrained unambiguously whereas three systems most likely have white dwarf companions. We find that the companion to SDSSJ083006.17+475150.3 is likely to be a rare example of a low-mass helium-core white dwarf. SDSSJ095101.28+034757.0 shows an excess in the infrared that probably originates from a third companion in a wide orbit, which makes this system the second candidate hierarchical triple system containing an sdB star. SDSSJ113241.58-063652.8 is the first helium deficient sdO star with a confirmed close companion. This study brings to 142 the number of sdB binaries with orbital periods of less than 30 days and with measured mass functions. We present an analysis of the minimum companion mass distribution and show that it is bimodal. One peak around 0.1M_☉ corresponds to the low-mass main sequence (dM) and substellar companions. The other peak around 0.4M_☉ corresponds to the white dwarf companions. The derived masses for the white dwarf companions are significantly lower than the average mass for single carbon-oxygen white dwarfs. In a T_eff-logg diagram of sdB+dM companions, we find signs that the sdB components are more massive than the rest of the sample. The full sample was compared to the known population of extremely low-mass white dwarf binaries as well as short-period white dwarfs with main sequence companions. Both samples show a significantly different companion mass distribution indicating either different selection effects or different evolutionary paths. We identified 16 systems where the dM companion will fill its Roche Lobe within a Hubble time and will evolve into a cataclysmic variable; two of them will have a brown dwarf as donor star. Twelve systems with confirmed white dwarf companions will merge within a Hubble time, two of them having a mass ratio to evolve into a stable AMCVn-type binary and another two which are potential supernova Ia progenitor systems. The remaining eight systems will most likely merge and form RCrB stars or massive C/O white dwarfs depending on the structure of the white dwarf companion.

Abstract Copyright: ∼

Journal keyword(s): subdwarfs - binaries: close

VizieR on-line data: <Available at CDS (J/A+A/576/A44): tablea2.dat tablea3.dat refs.dat>

Simbad objects: 146

Full paper

View the references in ADS

Number of rows : 146

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	PG 2359+197	HS*	00 02 08.4740452488	+19 59 13.142278968		14.40				sdB	19	0
2	Ton S 135	HS*	00 03 22.0702217664	-23 38 58.025588136		13.054	13.30			sdBHe1	37	0
3	PG 0001+275	HS*	00 03 55.6035118584	+27 48 37.466739936		13.16	13.32	13.60		sdB2VIIHe3	25	0
4	PB 5916	HS*	00 23 23.9888810856	-00 29 53.303337780		15.50	15.58	15.93		sdB+D	22	0
5	KPD 0025+5402	HS*	00 28 28.9694039256	+54 19 15.031311528	12.85	13.76	13.91	14.09		sdB	17	0
6	EC 00404-4429	HS*	00 42 48.3762666960	-44 13 25.218650964		13.0	13.4			sdB	20	0
7	NGC 188 2091	SB*	00 47 52.2151315344	+85 19 08.308468056	15.363	16.084	16.260	16.285	16.394	~	21	0
8	GD 656	HS*	00 51 03.9222688464	-19 59 59.319419640		14.56	14.83	15.01		sdBHe0	32	0
9	Ton S 183	HS*	01 01 17.5722745104	-33 42 45.434983572		12.39	14.631	12.95		sdB	53	0
10	Feige 11	HS*	01 04 21.6747168600	+04 13 37.054495956	10.847	11.826	12.065	12.183	12.324	sdB2VIHe4	136	0
11	GD 687	HS*	01 10 18.6196714608	-34 00 25.710906636		13.89	14.08	14.39		sdBHe1	40	0
12	PB 6373	HS*	01 18 57.2012100240	-00 25 46.524643284		14.26	14.804			sdBHe2	28	0
13	FBS 0117+396	HS*	01 20 22.9396883304	+39 50 59.434295604		15.15	15.34			sdB+dM	33	0
14	PG 0133+114	HS*	01 36 26.1919824456	+11 39 32.100292692		10.74				sdB1.5VIIHe4	48	0
15	CD-24 731	HS*	01 43 48.5449039272	-24 05 10.223541204		11.6	11.9			sdBHe0	71	0
16	EC 02200-2338	HS*	02 22 19.8375036240	-23 24 55.937378952		11.79	12.01			sdB	17	0
17	HE 0230-4323	HS*	02 32 54.6772339416	-43 10 27.791218308			13.78			sdB	35	0
18	PG 0319+055	HS*	03 21 38.6743563096	+05 38 40.152768900		15.02	15.05	15.16		sdB	26	1
19	Cl Melotte 20 488	HS*	03 21 39.6300972744	+47 27 18.797557932		11.54	11.73	11.83	11.55	sdB	25	0
20	Lan 30	HS*	03 28 55.2613544112	+50 35 29.669633016	13.644	14.3	14.3			sdB	19	0
21	BPS CS 22169-0001	HS*	03 56 23.3187391032	-15 09 19.438525044	11.50	12.61	12.88			sdB	25	0
22	V* IQ Cam	HS*	04 26 06.8650883976	+54 28 17.101122600	14.21	14.86	14.66			sdB	66	0
23	KUV 04421+1416	HS*	04 44 56.8983457992	+14 21 50.176351836		15.28				sdB	46	0
24	HD 269696	HS*	05 31 40.3594532592	-69 53 02.153902236	9.74	10.92	11.15			sdB+dM	202	0
25	HE 0532-4503	HS*	05 33 40.5164632128	-45 01 35.266985868	14.89	15.86	16.08			sdB	23	0
26	CPD-64 481	HS*	05 47 59.3028778320	-64 23 03.123185352		10.97	11.17			sdB	44	0
27	CPD-20 1123	HS*	06 06 13.3951675848	-20 21 07.275405420		11.75	11.80	11.84	11.90	sdB3VHe15	37	0
28	HD 49798	HXB	06 48 04.7001531360	-44 18 58.436036028	6.758	8.017	8.287	8.391	8.543	sdO6	339	0
29	V* V470 Cam	HS*	07 10 42.0513241680	+66 55 43.521505680						sdB+dM	118	0
30	EGB 5	HS*	08 11 12.7657907304	+10 57 17.099384400			14.2			sdB	57	1
31	GALEX J082053.6+000843	HS*	08 20 53.5359673248	+00 08 43.502407800		15.03	15.17	15.54	15.91	sdB	48	0
32	GALEX J082332.0+113644	HS*	08 23 32.0883550776	+11 36 41.913228096						sdB	17	1
33	PG 0826+480	HS*	08 30 06.1706625264	+47 51 50.365783728		16.1		16.28		sdB	30	0
34	PG 0839+399	HS*	08 43 12.7070709648	+39 44 49.808413428	12.918	14.045	14.324	14.445	14.587	sdB	40	0
35	Ton 358	HS*	08 52 54.6286389384	+31 43 36.648630876		14.29	14.59	14.78		sdOA	23	0
36	PG 0850+170	HS*	08 53 23.6576102448	+16 49 35.269007808		13.72	14.00	14.26		sdB	36	0
37	PG 0907+123	HS*	09 10 25.4347130256	+12 08 27.078221868		13.76	13.92	14.19		sdB2VIHe2	38	0
38	PG 0918+029	HS*	09 21 28.2138172968	+02 46 02.254084824	11.975	13.056	13.327	13.456	13.615	sdB1VIIHe6	118	0
39	Ton 13	HS*	09 22 39.8341061496	+27 02 25.424125980		12.27	12.658			sdB	43	0
40	HE 0929-0424	HS*	09 32 02.1130203840	-04 37 36.937709652		16.11	16.16			sdB	22	0
41	PG 0934+186	HS*	09 37 16.2701312016	+18 25 11.246800692		12.85	13.13	13.44		sdB	30	0
42	PG 0940+068	HS*	09 42 55.0400472528	+06 35 37.191101172		13.50	13.69	14.01		sdB	34	1
43	Ton 22	HS*	09 43 54.5499190968	+27 46 59.158337664		12.95	13.24			sdB	25	0
44	PG 0948+041	HS*	09 51 01.2879260424	+03 47 56.959039356		15.770	15.895	16.059		sdB+D	33	0
45	PG 0948+632	HS*	09 52 38.9349821112	+62 58 18.955488468		14.95	15.0			sdB	22	0
46	GD 108	HS*	10 00 47.2462375824	-07 33 30.773994012	12.406	13.349	13.563	13.662	13.781	sdB	150	1
47	PG 1000+408	HS*	10 03 54.2702671056	+40 34 18.121531548	11.919	12.988	13.318	13.465	13.631	sdO	38	0
48	V* XY Sex	HS*	10 20 14.4716431344	-08 53 46.406162688		14.46	14.43			sdB	40	0
49	GALEX J102151.6+301012	HS*	10 21 51.6455392728	+30 10 11.981229960		17.9		18.8		sdB+D	16	0
50	ASAS J102322-3737.0	HS*	10 23 21.8946607008	-37 36 59.909184792		11.43	11.51			sdB+dM	30	0
51	EC 10246-2707	HS*	10 26 56.4747793032	-27 22 57.097779564		14.56	14.77	14.85		sdB+dM	31	0
52	PG 1032+406	HS*	10 35 16.5804370224	+40 21 14.417268660		11.38	11.81			sdB	48	1
53	PG 1043+760	HS*	10 47 04.9690510104	+75 44 22.968415320		12.97				sdB	32	0
54	PG 1047-046	HS*	10 50 26.8995243000	-04 52 35.718249540		14.68				sdB+D	26	0
55	HE 1059-2735	HS*	11 01 24.8687002296	-27 51 41.914393668		15.21	15.56			sdO	12	0
56	Feige 36	HS*	11 04 31.6443383808	+24 39 42.687580896		12.87	12.78			sdB	59	0
57	Ton 62	HS*	11 13 04.4873645616	+29 07 46.225457796		14.2	14.086			sdB	26	0
58	PG 1115-065	HS*	11 18 11.6492036328	-06 47 32.162282988		14.83	15.08	15.59		sdO	13	0
59	Ton 63	HS*	11 19 04.8237788448	+29 51 52.663915008		14.11	14.37	14.61		sdB	38	1
60	PG 1130-063	HS*	11 32 41.5864573608	-06 36 52.766853516		16.2		16.0		sdO	18	0
61	PG 1136-003	HS*	11 38 40.6873530648	-00 35 31.775883972		14.22	14.47	14.79		sdB1VIIeHe1	30	0
62	Feige 48	HS*	11 47 14.4978515760	+61 15 31.789400364		13.12	13.28			sdB	125	0
63	PG 1230+052	HS*	12 33 12.5632632624	+04 57 37.603907964		13.26				sdB	29	0
64	PG 1232-136	HS*	12 35 18.7430526168	-13 55 08.879064096		13.06	13.27			sdB	34	0
65	EC 12408-1427	HS*	12 43 30.0485330304	-14 43 49.213141860		12.63	12.82	13.19		sdB	16	0
66	BD-07 3477	HS*	12 44 20.2386233232	-08 40 16.846099536		10.46	10.594	10.895		sdB2VIIHe3	303	1
67	PG 1244+113	HS*	12 47 06.6307680456	+11 03 13.355520768		13.05				sdB	26	0
68	[RWW88] CS 124636.2-631549	HS*	12 49 37.6226470128	-63 32 09.899403252		14.87	14.59	14.80	14.11	sdB6	27	0
69	GD 319	**	12 50 04.422072	+55 06 02.11932		12.398	12.259	12.147		sdOB+K3V	88	0
70	GD 319A	HS*	12 50 04.5143978208	+55 06 01.635493752						sdB	10	0
71	PG 1248+164	HS*	12 50 50.2676425896	+16 10 03.166128120		14.40	14.460			sdB	29	0
72	Ton 139	HS*	12 56 04.893960	+28 07 19.51716		12.922	12.759	12.866		sdB+F8V	54	0
73	LB 27	HS*	13 02 41.7580477728	+27 40 42.169462536		12.93	11.97			sdO6.5VIIpHe35	49	1
74	HE 1318-2111	HS*	13 21 15.6370363200	-21 27 17.629351236		14.57	14.77			sdO	20	0
75	Feige 81	HS*	13 31 53.5517863824	+15 41 17.573728740		13.24	13.507			sdBpec	53	0
76	EC 13332-1424	HS*	13 35 53.4857103648	-14 40 13.103444676		13.15	13.38	13.75		sdB	15	0
77	V* NY Vir	HS*	13 38 48.1466908176	-02 01 49.207286748		13.43	13.66	13.75		sdB1VIIHe1	237	1
78	Ton 168	HS*	13 46 32.6636967312	+28 17 22.812983196		14.686	14.908	15.223		sdB+D	25	0
79	Ton 183	HS*	14 05 59.8351289568	+31 24 36.712574280		13.31	13.49	13.81		sdB	27	0
80	CD-30 11223	HS*	14 11 16.1541452856	-30 53 03.700889340		12.101	12.296	12.659	12.541	sdB+DA	78	0
81	HE 1415-0309	HS*	14 18 20.9257079448	-03 22 53.992919352		16.6		16.3		sdB	15	0
82	[CW83] 1419-09	HS*	14 22 40.3209682608	-09 17 21.784718400			12.09			sdOB	21	0
83	PG 1421-121	HS*	14 24 08.7743935896	-12 20 20.221592100		15.4		15.77		sdB	14	0
84	PG 1432+159	HS*	14 35 18.9439382472	+15 40 14.376188748		13.63				sdB	36	1
85	PG 1438-029	HS*	14 40 52.8282561960	-03 08 52.656678456		13.64	13.79	14.23		sdBHe0	24	0
86	PG 1439-013	HS*	14 42 27.4791337968	-01 32 45.895458264		13.678	13.873	14.288		sdO	26	0
87	PG 1448-052	HS*	14 51 13.1204893176	-05 23 16.874665800		14.96				sdO8VIIHe0	18	0
88	PG 1452+198	HS*	14 54 39.8152055328	+19 37 00.855649740		12.30	12.94			sdB0.5VIIIHe7	26	0
89	PG 1502+113	HS*	15 05 13.5273847872	+11 08 36.707510400		15.14	15.38	15.87		sdB+D	16	0
90	SBSS 1506+498	SB*	15 08 29.0268644856	+49 40 50.914383456		17.5		17.6		O9V	18	0
91	Ton 788	HS*	15 14 32.4559114224	+24 10 40.705772196		13.03	13.21			sdB	42	0
92	PG 1519+640	HS*	15 20 31.3676002152	+63 52 08.251179924		12.03	12.18			sdB1.5VIIHe5	43	0
93	GALEX J152222.1-013018	HS*	15 22 22.1520741984	-01 30 18.312510312		17.3		17.7		sdB+D	16	0
94	PG 1528+104	HS*	15 31 10.3888662624	+10 15 00.931449960		13.90	14.14			sdB	24	0
95	FBS 1531+381	HS*	15 33 49.4441301600	+37 59 28.095378720			13.08			sdB+dM	52	0
96	Ton 245	HS*	15 40 23.4584740128	+26 48 29.782769184		13.653	13.859	14.073		sdB	52	0
97	PG 1558-007	HS*	16 01 13.9990783584	-00 51 42.013061064		13.49	13.54			sdB3VIIHe3	15	1
98	PG 1619+522	HS*	16 20 38.7296260680	+52 06 08.805043260		13.36				sdB0.5VIIHe7	35	0
99	PG 1621+476	HS*	16 22 56.6652852936	+47 30 51.128501040		16.07	16.19			sdB+dM	61	0
100	KUV 16256+4034	HS*	16 27 16.5352528272	+40 27 28.845006264		12.41	12.64	13.00		sdB	29	0
101	PG 1627+017	HS*	16 29 35.3015001600	+01 38 18.794125032		11.32				sdB3VIIHe3	45	0
102	PG 1648+536	HS*	16 49 59.8505534472	+53 31 31.719097380	12.811	13.835	14.050	14.140	14.264	sdB1VIIHe0	34	0
103	PG 1652+307	HS*	16 54 04.2604280400	+30 37 01.824863592		15.20	15.41	15.77		sdB	16	0
104	PG 1716+426	HS*	17 18 03.8584522800	+42 34 12.562847292		13.69	13.97			sdB2VIIHe3	122	0
105	PG 1724+278	HS*	17 26 24.0995740464	+27 44 19.354086276		15.707	15.994	16.183		sdB+D	16	0
106	PG 1725+252	HS*	17 27 57.3822732240	+25 08 35.697468192		11.54	13.01			sdB1.5VIIHe2	29	0
107	[CW83] 1735+22	HS*	17 37 26.4244582176	+22 08 57.716443392		11.51	11.65			sdB+A?	33	0
108	HS 1741+2133	HS*	17 43 19.0310761944	+21 32 37.570437456		13.82	13.99	14.21		sdOB	21	0
109	PG 1743+477	HS*	17 44 26.3960708352	+47 41 46.918908168		13.68	13.79	13.99		sdB2VIIHe7	35	0
110	PSR J1802-2124	Psr	18 02 05.334393	-21 24 03.67600						~	101	1
111	OGLE BUL-SC16 335	*	18 09 48.2260900608	-26 41 49.486723692				16.04		M	18	1
112	PSR J1816+4510	Psr	18 16 35.9342957160	+45 10 33.917516328						~	126	0
113	FBS 1832+631	SB*	18 32 49.0271316576	+63 09 10.595370312			16.5			B2	15	0
114	HD 171858	HS*	18 37 56.6714756304	-23 11 35.188389420		9.64	9.85			sdB	48	0
115	FBS 1903+432	HS*	19 05 06.3763958616	+43 18 31.220048592		14.978	15.218	15.505		sdB	35	1
116	UCAC4 637-067297	HS*	19 20 59.7745342512	+37 22 20.017123212		15.897	15.745	16.037		sdB	19	0
117	ATO J291.5394+37.3356	HS*	19 26 09.4422931056	+37 20 08.163008556		13.60	13.63	14.05	13.96	sdB+dM	41	0
118	UCAC4 698-068637	HS*	19 26 34.1086958928	+49 30 29.555956908		14.548	14.859	15.096		sdB	44	1
119	KPD 1930+2752	HS*	19 32 14.8088063952	+27 58 35.445679608	12.80	13.75	13.82			sdB	167	0
120	Kepler-451	HS*	19 38 32.6123816016	+46 03 59.135231952		12.17	12.69	12.46	12.399	sdB+dM	103	0
121	KPD 1946+4340	HS*	19 47 42.8876526504	+43 47 30.754543092	13.05	14.06	14.23	14.92		sdOB+D	62	0
122	UCAC4 689-072699	HS*	19 53 08.3854563936	+47 43 00.177113460		14.695	14.902	15.419		sdB	34	1
123	V* V1828 Aql	HS*	20 20 00.4587151080	+04 37 56.517736296		12.9		13.34		sdOB+dM	77	1
124	EC 20182-6534	HS*	20 22 51.3035537112	-65 25 20.436341088	12.17	13.09	13.29	13.58		sdB	14	0
125	EC 20260-4757	HS*	20 29 34.1085324120	-47 47 26.297317176	12.47	13.55	13.73	14.12		sdB	13	0
126	EC 20369-1804	HS*	20 39 46.3765474896	-17 54 04.928674680	11.96	13.08	13.35	13.69		sdB	10	0
127	KPD 2040+3955	HS*	20 42 33.9314151936	+40 05 41.601180120	13.62	14.34	14.48	14.59		sdB	20	0
128	GALEX J204613.4-045418	HS*	20 46 13.3997229312	-04 54 18.732467916		15.961	16.324			sdB+D	14	0
129	HS 2043+0615	HS*	20 46 20.7938414832	+06 26 25.336612716		16.9		16.20		sdB	15	0
130	JL 82	HS*	21 36 01.2957494184	-72 48 27.222290172	11.26	12.44	12.41	12.67		sdB	42	0
131	BPS CS 30343-0091	HS*	21 38 44.1996638736	-37 36 14.997662460	12.66	13.68	13.9			sdB	22	0
132	HE 2150-0238	HS*	21 52 35.5115148504	-02 24 29.523285216		15.8		16.2		sdB	15	0
133	EC 21556-5552	HS*	21 59 00.6889021608	-55 38 03.714888048	11.94	12.71	12.99			sdB	16	0
134	KPD 2215+5037	HS*	22 17 20.7353553744	+50 52 58.930200480	12.66	13.59	13.64	14.00		sdB	23	0
135	PHL 244	HS*	22 22 58.0609082424	-18 19 10.027308396		13.65	13.80	14.13		sdB	12	0
136	HS 2231+2441	HS*	22 34 21.4832585640	+24 56 57.392918196			14.20			sdB+dM	58	0
137	PB 7352	HB*	22 55 43.1874214920	-06 59 39.865486164		12.09	12.21			sd	22	0
138	PG 2254+067	HS*	22 56 38.3455333032	+06 56 51.179249220		15.18				sdB	20	0
139	LB 1516	HS*	23 01 56.1476771616	-48 03 48.474964296		12.74	13.02			sdB	33	0
140	Feige 108	HS*	23 16 12.4074790200	-01 50 35.103759540	11.671	12.736	12.973	13.079	13.218	sdB	66	0
141	GD 1110	HS*	23 19 24.4299110400	-08 52 37.936761780		12.778	12.947	13.265	13.179	sdB	43	0
142	PG 2317+046	HS*	23 19 55.3509680256	+04 52 34.659100740	11.493	12.630	12.876	12.950	12.994	sdO8VIIHe1	39	0
143	PG 2331+038	HS*	23 33 58.1991530664	+04 03 55.368287928		14.78	14.63	15.19		sdB1.5VIIHe2	24	0
144	HS 2333+3927	HS*	23 35 42.5025647712	+39 44 27.064626936			14.53			sdOB	48	0
145	PG 2345+318	HS*	23 48 07.5058804680	+32 04 48.038131020		13.99	14.19	14.66		sdB	32	0
146	FBS 2347+385	HS*	23 49 47.6462597640	+38 44 41.547259860		11.65	11.73	12.03		sdB	26	0

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