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.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

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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2022.08.10-06:20:25

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