2018ApJ...857...30M

Query : 2018ApJ...857...30M

2018ApJ...857...30M - Astrophys. J., 857, 30-30 (2018/April-2)

Excitation mechanism of O I lines in Herbig Ae/Be stars.

MATHEW B., MANOJ P., NARANG M., BANERJEE D.P.K., NAYAK P., MUNEER S., VIG S., PRAMOD KUMAR S., PAUL K.T. and MAHESWAR G.

Abstract (from CDS):

We have investigated the role of a few prominent excitation mechanisms viz. collisional excitation, recombination, continuum fluorescence, and Lyman beta fluorescence on the O I line spectra in Herbig Ae/Be stars. The aim is to understand which of them is the central mechanism that explains the observed O I line strengths. The study is based on an analysis of the observed optical spectra of 62 Herbig Ae/Be stars and near-infrared spectra of 17 Herbig Ae/Be stars. The strong correlation observed between the line fluxes of O I λ8446 and O I λ11287, as well as a high positive correlation between the line strengths of O I λ8446 and Hα suggest that Lyman beta fluorescence is the dominant excitation mechanism for the formation of O I emission lines in Herbig Ae/Be stars. Furthermore, from an analysis of the emission line fluxes of O I λλ7774, 8446, and comparing the line ratios with those predicted by theoretical models, we assessed the contribution of collisional excitation in the formation of O I emission lines.

Journal keyword(s): circumstellar matter - infrared: stars - stars: pre-main sequence - stars: variables: T Tauri, Herbig Ae/Be - techniques: spectroscopic

Simbad objects: 64

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Number of rows : 64

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2022	#notes
1	EM* LkHA 198	Ae*	00 11 25.8495450336	+58 49 28.713961920		14.65	13.79	14.03		B9e	222	0
2	V* V376 Cas	Ae*	00 11 26.5410514344	+58 50 03.929517960						A3/F2e	96	1
3	BD+61 154	Ae*	00 43 18.2566590360	+61 54 40.139212716	10.83	11.13	10.60			B8eq	198	1
4	HBC 334	Em*	02 16 30.7111817472	+55 23 00.139141680		14.92	14.32	14.52		B3	32	0
5	BD+30 549	Y*O	03 29 19.7773614209	+31 24 57.044926178	10.81	10.95	10.47	10.587		B8/9V	102	0
6	HD 278937	Em*	03 40 46.9605708144	+32 31 53.715087444		10.66	10.40			A7III:kA2.5mA3e(r)	80	0
7	V* XY Per	Ae*	03 49 36.3365862552	+38 58 55.548299928	12.12	10.14	9.58	9.54	8.40	A2II+B6	146	0
8	V* AB Aur	Ae*	04 55 45.8458932216	+30 33 04.292077032	7.20	7.16	7.05	6.96	6.70	A0Ve	996	2
9	HD 31648	Ae*	04 58 46.2655706952	+29 50 36.987625680	7.84	7.78	7.62	7.76	7.43	A5Vep	463	0
10	V* UX Ori	Ae*	05 04 29.9878898040	-03 47 14.286732072	10.25	10.93	8.70	9.62	9.43	A4IVe	351	1
11	2MASS J05065551-0321132	TT*	05 06 55.5165452664	-03 21 13.327504020	13.54	13.65	12.84	12.18	11.42	B3e	35	1
12	V* V1012 Ori	Y*O	05 11 36.5463110880	-02 22 48.458344836		12.61	12.45			A3e	40	0
13	V* V1366 Ori	Ae*	05 16 00.4765181328	-09 48 35.393784012	10.19	10.16	9.84	9.77	9.63	B9.5V	184	0
14	HD 35187	Y*O	05 24 01.17261	+24 57 37.5791		8.79	8.71	8.72		A2e+A7	102	0
15	HD 35929	dS*	05 27 42.7906489200	-08 19 38.446702140		8.55	8.11			F2IV/V	100	0
16	HD 36112	Ae*	05 30 27.5285630040	+25 19 57.076288752		8.57	8.27			A8Ve	419	0
17	V* HK Ori	Ae*	05 31 28.049808	+12 09 10.30212	11.82	12.235	11.716	11.632	10.56	A2?e+G0?e	186	1
18	V* UY Ori	Y*O	05 32 00.307776	-04 55 53.90508		12.00	11.80	12.41		B9	31	0
19	HD 245185	Ae*	05 35 09.6034684104	+10 01 51.465413208	10.05	10.07	9.93			A0Vae	116	0
20	M 42	HII	05 35 17.3	-05 23 28						~	3919	0
21	V* CQ Tau	Ae*	05 35 58.4666264136	+24 44 54.091450572	11.290	10.780	10.000		8.33	F5IVe	283	0
22	* ome Ori	Be*	05 39 11.1463172	+04 07 17.279475	3.73	4.48	4.59	4.57	4.67	B3Ve	398	1
23	HD 37806	Be*	05 41 02.2930798296	-02 43 00.731764812	7.67	7.93	7.90			B9/9.5II/III	150	0
24	HD 38120	Be*	05 43 11.8932782280	-04 59 49.889995692	9.08	9.10	9.1			B9Vnne	82	0
25	HD 250550	Ae*	06 01 59.9892055464	+16 30 56.727549864		9.60	9.593	9.64		B9e	238	1
26	V* VY Mon	Ae*	06 31 06.9271406952	+10 26 04.952351076	16.65	15.45	13.70	12.49	11.00	A5:Vep	93	0
27	EM* LkHA 215	Ae*	06 32 41.7730499472	+10 09 34.209036180	11.41	11.28	10.70			B7IIne	125	0
28	HD 259431	Ae*	06 33 05.1906369144	+10 19 19.982565336	8.39	8.95	8.72			B6ep	276	1
29	HD 52721	Ae*	07 01 49.50977	-11 18 03.3219	5.88	6.65	6.59	7.52		B2Vne	209	0
30	V* Z CMa	Ae*	07 03 43.1599411656	-11 33 06.209065836	10.51	9.99	8.80			B5/8eq+F5/7	555	3
31	EM* LkHA 220	Ae*	07 04 06.7000977696	-11 26 08.505214800		11.62	11.60			B8e	56	0
32	HD 53367	Ae*	07 04 25.5189757244	-10 27 15.613478141	6.81	7.40	6.96	7.92		B0IV/Ve	312	0
33	HD 141569	Y*O	15 49 57.7482550392	-03 55 16.341617064	7.22	7.20	7.12	7.00	7.04	A2VekB9mB9(_lB)	501	0
34	HD 142666	TT*	15 56 40.0221861696	-22 01 40.005872148	9.41	9.37	8.82	8.31	8.01	F0V_sh	241	0
35	HD 144432	Ae*	16 06 57.9533126832	-27 43 09.760564056	8.47	8.53	8.19	7.82	7.53	A9/F0V	228	1
36	HD 145718	Ae*	16 13 11.5918435992	-22 29 06.621987516		9.29	8.86			A5Ve	98	0
37	HD 150193	Be*	16 40 17.9243127240	-23 53 45.193372692	9.69	9.32	8.79	8.41		B9.5Ve	305	0
38	* c Oph	Be*	17 31 24.9541340	-23 57 45.513592	4.75	4.81	4.81	4.74	4.72	A0V	264	0
39	HD 163296	Ae*	17 56 21.2881851168	-21 57 21.871819008	7.00	6.93	6.85	6.86	6.67	A1Vep	967	0
40	HD 169142	Ae*	18 24 29.7799891464	-29 46 49.327400568		8.42	8.16			F1VekA3mA3_lB?	391	2
41	EM* MWC 297	Ae*	18 27 39.5265500160	-03 49 52.133050776	15.57	14.34	12.31	11.34		B1.5Ve	282	0
42	V* VV Ser	Ae*	18 28 47.8620017808	+00 08 39.923474964	12.99	12.63	11.80	11.01	10.24	A5Ve	241	0
43	V* R CrA	Ae*	19 01 53.6764322232	-36 57 08.299341828	12.781	12.651	11.917	11.242	10.412	B5IIIpe	464	1
44	HD 179218	Ae*	19 11 11.2538919456	+15 47 15.636008472	7.55	7.476	7.39	7.25	7.21	A0Ve	236	0
45	V* WW Vul	Ae*	19 25 58.7494120560	+21 12 31.333658616	11.46	10.99	10.25	10.38	10.12	A2IVe	220	0
46	V* PX Vul	Or*	19 26 40.2532914312	+23 53 50.782579116	12.56	12.57	11.83	10.90	10.30	F3Ve	53	0
47	HD 190073	Ae*	20 03 02.5098474264	+05 44 16.660712904	7.91	7.86	7.73		7.65	A2IVe	242	0
48	* P Cyg	s*b	20 17 47.2020844	+38 01 58.552724	4.66	5.24	4.82	4.28	4.02	B1-2Ia-0ep	1154	1
49	BD+40 4124	Ae*	20 20 28.2413946720	+41 21 51.529070088	11.11	11.36	10.62	10.510		B2Ve	286	1
50	EM* LkHA 224	Ae*	20 20 29.3503944888	+41 21 28.410038964	14.82	14.08	12.93	12.05	11.08	A4:Ve	98	0
51	EM* AS 442	Ae*	20 47 37.4657848584	+43 47 24.975739896	11.90	11.56	10.90	10.18	9.95	B8Ve	90	0
52	EM* AS 443	Ae*	20 48 04.7805698496	+43 47 25.854540792		11.77	11.42			B8/A0e	57	0
53	EM* LkHA 167	Ae*	20 52 04.6428035640	+44 37 30.437414400		17.0				A1/9e	28	0
54	HD 200775	Ae*	21 01 36.9205762896	+68 09 47.789578836	7.34	7.754	7.427	8.13		B2Ve	531	0
55	BD+65 1637	Ae*	21 42 50.1798725784	+66 06 35.186616864	10.21	10.56	10.53	10.29		B3IV-Vne	153	1
56	EM* LkHA 234	Ae*	21 43 06.8218113480	+66 06 54.202272804	13.65	13.61	12.73	11.98	11.20	B5Ve	282	0
57	BD+46 3471	Ae*	21 52 34.0992801288	+47 13 43.605617340	10.72	10.56	10.15			A0.5IIIer	205	1
58	EM* LkHA 257	Ae*	21 54 18.7801883568	+47 12 09.667447308	15.195	13.87	13.16			B5/A2e	55	0
59	V* BO Cep	Ae*	22 16 54.0583196880	+70 03 44.988517332	11.86	11.98	11.55	11.16	10.84	F5Ve	65	0
60	V* SV Cep	Ae*	22 21 33.2166238512	+73 40 27.097678812	11.40	11.25	10.35	10.28	10.08	A2IVe	126	0
61	EM* LkHA 233	Ae*	22 34 40.9923134958	+40 40 04.251892858		14.5				A7Ve	142	0
62	HD 216629	Ae*	22 53 15.6041662488	+62 08 45.000921228	9.83	9.93	9.36	9.31		B3IVe+A3	132	0
63	EM* AS 505	Ae*	23 05 07.4612179272	+62 15 36.504610992	10.09	11.5	10.9			B5Vep	61	0
64	EM* MWC 1080	Ae*	23 17 25.5895018656	+60 50 43.444557384		13.24	11.542			B0eq	315	0

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