2024MNRAS.530.3020A

Query : 2024MNRAS.530.3020A

2024MNRAS.530.3020A - Mon. Not. R. Astron. Soc., 530, 3020-3037 (2024/May-3)

Chandra X-ray analysis of Herbig Ae/Be stars.

ANILKUMAR H., MATHEW B., JITHESH V., KARTHA S.S., MANOJ P., NARANG M. and CHAVALI M.

Abstract (from CDS):

Herbig Ae/Be (HAeBe) stars are intermediate-mass pre-main-sequence stars, characterized by infrared (IR) excess and emission lines. They are observed to emit X-rays, whose origin is a matter of discussion and not settled yet. X-ray emission is not expected in HAeBe stars, as they lack the subsurface convective zone. In this study, we retrieved observations from the Chandra archive for 62 HAeBe stars, among which 44 sources (detection fraction ∼71 per cent) were detected in X-rays, with 7 being new detections. We use this sample as a test bed to conduct a comparative analysis of the X-ray properties of HAeBe stars and their low-mass counterparts, T Tauri stars (TTSs). Further, we compare the X-ray properties of HAeBe stars and TTSs with optical and IR properties to constrain the X-ray emission mechanism in HAeBe stars. We found no correlation between X-ray emission and disc properties of HAeBe stars, confirming that X-rays are not related to accretion shocks. About 56 per cent of HAeBe stars without any known subarcsec companions have lower plasma temperatures (kT ≤ 2 keV). We observe flaring/variability in HAeBe stars with confirmed low-mass companions. These stars show plasma temperatures > 2 keV, similar to TTSs. Guided by this information, we discuss the role of a T Tauri companion for X-ray emission seen in our sample of HAeBe stars. From the results obtained in this paper, we suggest that X-ray emission from HAeBe stars may not be related to accretion shocks or hidden TTS, but rather can be due to magnetically driven coronal emission.

Abstract Copyright: © 2024 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.

Journal keyword(s): techniques: imaging spectroscopy - stars: coronae - stars: flare - stars: low-mass - stars: massive - stars: pre-main-sequence

Simbad objects: 75

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Number of rows : 75
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 BD+30 549 Or* 03 29 19.7773614209 +31 24 57.044926178 10.81 10.95 10.47 10.587   B8/9V 129 0
2 V* V892 Tau Ae* 04 18 40.6157618376 +28 19 15.625058880   16.6 14.69 14.35   A0Ve 324 0
3 V* V892 Tau B LM* 04 18 40.7282131800 +28 19 19.287964272           M3 14 0
4 NAME Tau-Aur Complex SFR 04 30 +25.0           ~ 1453 0
5 V* AB Aur Ae* 04 55 45.8458932216 +30 33 04.292077032 7.20 7.16 7.05 6.96 6.70 A0Ve 1176 2
6 HD 31648 Ae* 04 58 46.2655706952 +29 50 36.987625680 7.84 7.78 7.62 7.76 7.43 A5Vep 612 0
7 HD 287841 Y*O 05 24 42.8032369656 +01 43 48.249234516 10.55 10.45 10.17 9.99 9.80 A8V 123 0
8 HD 244604 Or* 05 31 57.2511172320 +11 17 41.368840404   9.61 9.43     A0Vesh 92 0
9 BD-05 1299 Or* 05 34 14.1619196472 -05 36 54.187822224 11.081 10.697 10.219   9.425 F8 84 0
10 HD 36917 Or* 05 34 46.9822530528 -05 34 14.583314568   8.13 8.03     B9III/IV 167 0
11 HD 36939 V* 05 34 55.2955987536 -05 30 22.104460800   9.00 9.01     B8V(n) 94 0
12 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2514 0
13 HD 36982 Or* 05 35 09.8363878512 -05 27 53.216296776 8.00 8.58 8.46     B2V 225 0
14 V* MR Ori Or* 05 35 16.9783073496 -05 21 45.337307544 11.386 10.876 10.578   9.836 A2:Vv 67 0
15 * tet02 Ori C Or* 05 35 31.4311124640 -05 25 16.371705000   7.80 8.24     B4V 136 1
16 V* T Ori Ae* 05 35 50.4482802768 -05 28 34.925254536 12.724 11.637 11.248 10.09 10.043 A8VnekA1mA2_lB 259 0
17 BD-06 1253 Ae* 05 36 25.4320468080 -06 42 57.684730284   11.65 10.9 10.29   A1e 450 1
18 HD 245906 Or* 05 39 30.4814754408 +26 19 55.172817444   10.97 10.20     A6 38 0
19 V* RR Tau Ae* 05 39 30.5115918672 +26 22 26.967444996 11.64 12.09 11.28 10.58 10.17 A0:IVe 237 0
20 HD 250550 Ae* 06 01 59.9892055464 +16 30 56.727549864   9.60 9.593 9.64   B9e 254 1
21 EM* LkHA 339 Ae* 06 10 57.8449670232 -06 14 39.659250840   14.44 13.60 13.44 12.50 A1e 44 0
22 HD 259431 Ae* 06 33 05.1906369144 +10 19 19.982565336 8.39 8.95 8.72     B6ep 299 1
23 RAFGL 961 Y*O 06 34 37.74144 +04 12 44.1972           O-rich 242 1
24 V* R Mon Ae* 06 39 09.9542000448 +08 44 09.539482632 10.76 12.46 11.85 10.96 10.25 B8IIIe 525 0
25 NGC 2264 84 TT* 06 40 42.1820308368 +09 33 37.422060732 12.575 12.57 12.01 11.74 11.33 G0 87 0
26 EM* LkHA 25 Ae* 06 40 44.6376365304 +09 48 02.151653868 12.745 13.03 18.85 12.545 12.386 B4Ve 153 0
27 NGC 2264 108 TT* 06 40 51.1854488784 +09 44 46.109300100 12.684 12.42 12.004 11.661 11.35 F8V 90 0
28 V* Z CMa Ae* 07 03 43.1599411656 -11 33 06.209065836 10.51 9.99 8.80     B5/8eq+F5/7 601 3
29 THA 35-II-3 Or* 10 10 00.3244888680 -57 02 07.354107816   15.163 13.643 13.001   Be 57 0
30 HD 97300 Ae* 11 09 50.0199904704 -76 36 47.718191232   9.41 9.20   8.82 B9V 190 1
31 HD 100453 Ae* 11 33 05.5766482920 -54 19 28.547100696   8.09 7.79     F1Vn 335 1
32 HD 100453B * 11 33 05.5767 -54 19 28.537     15.88     M4.0V 23 0
33 HD 100546 Be* 11 33 25.4408872296 -70 11 41.241297948   6.71 6.30   6.64 A0VaekB8_lB 894 1
34 [FLG2003] eps Cha 4 * 12 00 04.4487182436 -78 11 35.030742497           K3V 18 0
35 V* DX Cha Ae* 12 00 05.0868602544 -78 11 34.565724312   6.81 6.60     A4V 365 0
36 CD-39 8581A Or* 13 57 43.9439728056 -39 58 47.306795628       10.370   B7 12 0
37 NGC 5367 RNe 13 57 44 -39 58.8           ~ 31 1
38 CD-39 8581 ** 13 57 44.11656 -39 58 44.1660           B4+B7 54 0
39 CD-39 8581B Or* 13 57 44.1257018136 -39 58 44.194297404       10.740   B4 9 0
40 HD 135344B Or* 15 15 48.4460065200 -37 09 16.024369824   9.21 8.708     F8V 548 0
41 HD 135344 Or* 15 15 48.9462675744 -37 08 55.731368400   7.84 7.76     A0V 155 1
42 CD-25 11111A TT* 15 49 15.3256555968 -26 00 54.697740660   13.37 12.81 12.73   A5Ve 37 0
43 HD 141569 Or* 15 49 57.7482550392 -03 55 16.341617064 7.22 7.20 7.12 7.00 7.04 A2VekB9mB9(_lB) 578 0
44 HD 144432 Ae* 16 06 57.9533126832 -27 43 09.760564056 8.47 8.53 8.19 7.82 7.53 A9IVe 266 0
45 V* V856 Sco Ae* 16 08 34.2870044544 -39 06 18.325711332 7.66 7.41 7.05 6.92   A9V_sh 405 0
46 V* V856 Sco B * 16 08 34.3896466272 -39 06 19.253294604           ~ 3 0
47 V* V1027 Sco a2* 16 08 34.5616203192 -39 05 34.278268848   6.552 6.629 6.66   A0/3III 204 0
48 HD 147889 Or* 16 25 24.3163637976 -24 27 56.569805208 8.56 8.73 7.90     B2V 512 1
49 HD 150193B TT* 16 40 17.8688039127 -23 53 45.966283470           F9Ve 14 0
50 HD 150193 Ae* 16 40 17.9243127240 -23 53 45.193372692 9.69 9.32 8.79 8.41   A3Va(e) 336 0
51 V* AK Sco Ae* 16 54 44.8491575376 -36 53 18.566586456 9.80 9.63 9.00     F5V 304 1
52 HD 163296 Ae* 17 56 21.2881851168 -21 57 21.871819008 7.00 6.93 6.85 6.86 6.67 A3VaekA1mA1 1301 0
53 V* EU Ser Ae* 18 19 09.3931184496 -13 50 41.201118528 14.934 14.697 14.158   12.923 Be 35 0
54 HD 169142 Ae* 18 24 29.7799891464 -29 46 49.327400568   8.42 8.16     F1VekA3mA3_lB? 535 0
55 EM* MWC 930 s*b 18 26 25.2364693368 -07 13 17.815243512   14.20 11.51 11.87 9.40 B5/9Iaeq 50 1
56 EM* MWC 297 Ae* 18 27 39.5265500160 -03 49 52.133050776 15.57 14.34 12.31 11.34   B1.5Ve 315 0
57 [DLM2010] EC 95a Y*O 18 29 57.89187 +01 12 46.1101           ~ 3 0
58 [EC92] 95 Y*O 18 29 57.893 +01 12 46.25           K1.0 79 3
59 EM* AS 310 Ae* 18 33 21.1940364288 -04 58 05.976557796   13.58 12.52 12.62   B1e 136 1
60 EM* MWC 953 Ae* 18 43 28.4237099640 -03 46 17.027278752 11.86 11.9 10.8     B2Ve 34 0
61 HD 176386 Or* 19 01 38.9318002416 -36 53 26.561166432 7.28 7.44 7.32 8.11   B9Vbs 149 0
62 HD 176386B Y*O 19 01 39.1617674928 -36 53 29.571918828           K7: 27 0
63 V* TY CrA Ae* 19 01 40.8284458320 -36 52 33.816176040 10.03 9.92 9.39     B9e 301 0
64 V* R CrA Ae* 19 01 53.6764322232 -36 57 08.299341828 12.781 12.651 11.917 11.242 10.412 B5IIIpe 499 2
65 V* T CrA Ae* 19 01 58.777008 -36 57 49.93704   14.087 13.130 11.823 10.678 F5? 179 0
66 Min 1-92 pA* 19 36 18.9295687968 +29 32 49.785288144 12.13 12.35 11.75 11.54   B0.5IV[e] 267 0
67 HD 190073 Ae* 20 03 02.5098474264 +05 44 16.660712904 7.91 7.86 7.73   7.65 A2IVe 274 0
68 IRAS 21365+5713 Or* 21 38 08.4580163424 +57 26 47.628322116   11.82 11.41     A2 35 0
69 BD+65 1637 Ae* 21 42 50.1798725784 +66 06 35.186616864 10.21 10.56 10.53 10.29   B3IV-Vne 168 1
70 BD+65 1638 Or* 21 42 58.5801989808 +66 06 10.505819988   10.63 10.42 10.09   B3V 34 0
71 NGC 7129 OpC 21 43 01.1 +66 07 04     11.5     ~ 271 0
72 EM* LkHA 234 Ae* 21 43 06.8218113480 +66 06 54.202272804 13.65 13.61 12.73 11.98 11.20 B5Ve 295 0
73 BD+46 3471 Ae* 21 52 34.0992801288 +47 13 43.605617340 10.72 10.56 10.15     A0.5IIIer 222 1
74 EM* LkHA 257 Ae* 21 54 18.7801883568 +47 12 09.667447308 15.195 13.87 13.16     B5/A2e 65 0
75 V* BP Psc pA? 23 22 24.6974756088 -02 13 41.378919456   13.32 11.85     G9IIIe 54 0

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