2008ApJ...684..411K


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.12CEST16:00:48

2008ApJ...684..411K - Astrophys. J., 684, 411-429 (2008/September-1)

PAH emission from Herbig Ae/Be stars.

KELLER L.D., SLOAN G.C., FORREST W.J., AYALA S., D'ALESSIO P., SHAH S., CALVET N., NAJITA J., LI A., HARTMANN L., SARGENT B., WATSON D.M. and CHEN C.H.

Abstract (from CDS):

We present spectra of a sample of Herbig Ae and Be (HAeBe) stars obtained with the Infrared Spectrograph on Spitzer. All but one of the Herbig stars show emission from PAHs, and seven of the spectra show PAH emission, but no silicate emission at 10 µm. The central wavelengths of the 6.2, 7.7-8.2, and 11.3 µm emission features decrease with stellar temperature, indicating that the PAHs are less photoprocessed in cooler radiation fields. The apparent low level of photoprocessing in HAeBe stars, relative to other PAH emission sources, implies that the PAHs are newly exposed to the UV-optical radiation fields from their host stars. HAeBe stars show a variety of PAH emission intensities and ionization fractions but a narrow range of PAH spectral classifications based on positions of major PAH feature centers. This may indicate that, regardless of their locations relative to the stars, the PAH molecules are altered by the same physical processes in the protoplanetary disks of intermediate-mass stars. Analysis of the mid-IR SEDs indicates that our sample likely includes both radially flared and more flattened/settled disk systems, but we do not see the expected correlation of overall PAH emission with disk geometry. We suggest that the strength of PAH emission from HAeBe stars may depend not only on the degree of radial flaring but also on the abundance of PAHs in illuminated regions of the disks and possibly on the vertical structure of the inner disk as well.

Abstract Copyright:

Journal keyword(s): Infrared: Stars - Stars: Planetary Systems: Protoplanetary Disks

Simbad objects: 37

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Number of rows : 37

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 LZK 12 Y*O 03 29 10.4138336046 +31 21 59.070333199   16.06 14.25     B5:V+F2: 127 0
2 HD 281789 * 04 13 20.0241307376 +31 10 47.284145555   10.49 10.16     A1e 23 0
3 V* V892 Tau Ae* 04 18 40.6120892867 +28 19 15.641672501   16.6 14.69 14.35   A0Ve 266 0
4 V* AB Aur Ae* 04 55 45.8459978418 +30 33 04.293281305 7.20 7.16 7.05 6.96 6.70 A0Ve 932 2
5 V* SU Aur Or* 04 55 59.3861369488 +30 34 01.499800471   10.33 9.30 9.17   G2IIIne 534 0
6 HD 31648 Ae* 04 58 46.2654165113 +29 50 36.990341242 7.84 7.78 7.62 7.76 7.43 A5Vep 394 0
7 HD 32509 Y*O 05 04 50.1337362256 +26 43 14.788736440   7.69 7.52     A2e 23 0
8 V* V1366 Ori Ae* 05 16 00.4764811920 -09 48 35.394685295 10.19 10.16 9.84 9.77 9.63 B9.5V 164 0
9 HD 35187 Y*O 05 24 01.17261 +24 57 37.5791   8.79 8.71 8.72   A2e+A7 95 0
10 HD 35344 * 05 25 48.5528774855 +38 33 31.784496790   9.31 9.32     B9 6 0
11 HD 44179 pA* 06 19 58.2185496 -10 38 14.706068 9.51 9.33 9.02     B9Ib/II 715 0
12 HD 233517 * 08 22 46.7144627395 +53 04 49.232441095   10.85 9.71     K2 80 0
13 HD 97048 Ae* 11 08 03.3105687971 -77 39 17.491180130 9.03 8.76 9.00   8.64 A0Vep 458 0
14 HD 97300 Ae* 11 09 50.0178181814 -76 36 47.711452436   9.41 9.20   8.82 B9V 157 1
15 HD 100453 Ae* 11 33 05.5765928993 -54 19 28.543792679   8.09 7.79     A9Ve 196 1
16 HD 100546 Be* 11 33 25.4404858122 -70 11 41.239343121   6.71 6.30   6.64 A0VaekB8_lB 651 1
17 HD 100764 Pe* 11 35 42.7476806995 -14 35 36.663269333   9.81 8.79 8.08 7.65 C-H2.5 98 0
18 V* DX Cha Ae* 12 00 05.0870448691 -78 11 34.559255151   6.81 6.60     A0_sh 306 0
19 IRAS 13416-6243 pA* 13 45 07.2570740611 -62 58 16.832906949           G1I 40 0
20 CPD-36 6759 Y*O 15 15 48.4459023859 -37 09 16.026315179   9.21 8.708     F8V 357 1
21 HD 135344 * 15 15 48.9457954324 -37 08 55.727525343   7.84 7.76     A0V 128 1
22 HD 139614 pr* 15 40 46.3818973118 -42 29 53.538928508   8.47 8.24     A9VekA5mA5(_lB) 160 0
23 HD 139619 * 15 42 54.4113790704 -64 27 32.919734734   9.75 9.69     B9/A0V 8 0
24 HD 141569 pr* 15 49 57.7484743862 -03 55 16.344023102 7.22 7.20 7.12 7.00 7.04 A2VekB9mB9(_lB) 471 0
25 HD 142666 TT* 15 56 40.0222941557 -22 01 40.004849949 9.41 9.37 8.82 8.31 8.01 F0V_sh 218 0
26 HD 144432 Ae* 16 06 57.9530266912 -27 43 09.758016578 8.47 8.53 8.19 7.82 7.53 A9/F0V 211 1
27 HD 145718 Ae* 16 13 11.5918477499 -22 29 06.620148459   9.29 8.86     A5Ve 85 0
28 V* AK Sco Ae* 16 54 44.8497760618 -36 53 18.560813962 9.80 9.63 9.00     F5V 235 1
29 HD 154391 PM* 17 01 16.9260540259 +60 38 55.517249329   7.164 6.143     K1III 68 0
30 * c Oph Be* 17 31 24.9541340 -23 57 45.513592 4.75 4.81 4.81 4.74 4.72 A0V 254 0
31 * ksi Dra PM* 17 53 31.7296234 +56 52 21.514262 6.14 4.93 3.75 2.92 2.33 K2III 255 0
32 HD 166780 * 18 08 38.8450768674 +57 58 46.860455191   8.79 7.34     K5III 41 0
33 HD 169142 Ae* 18 24 29.7799676975 -29 46 49.328597698   8.42 8.16     F1VekA3mA3_lB? 335 2
34 * alf Lyr dS* 18 36 56.33635 +38 47 01.2802 0.03 0.03 0.03 0.07 0.10 A0Va 2505 0
35 HD 173511 PM* 18 41 40.5912712781 +61 32 47.094209972   8.69 7.23     K5III 48 0
36 HD 179218 Ae* 19 11 11.2540715594 +15 47 15.632212730 7.55 7.476 7.39 7.25 7.21 A0Ve 221 0
37 V* V1610 Cyg pA* 21 02 18.27 +36 41 37.0           F5Iae 830 1

    Equat.    Gal    SGal    Ecl

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2020.07.12-16:00:48

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