2002A&A...384..568V


Query : 2002A&A...384..568V

2002A&A...384..568V - Astronomy and Astrophysics, volume 384, 568-584 (2002/3-3)

Nanodiamonds around HD 97048 and Elias 1.

VAN KERCKHOVEN C., TIELENS A.G.G.M. and WAELKENS C.

Abstract (from CDS):

We present an analysis of ISO-SWS observations of the Herbig Ae/Be stars HD 97048 and Elias 1. Besides the well-known family of IR emission bands at 3.3, 6.2, ``7.7'', 8.6 and 11.2µm these objects show strong, peculiar emission features at 3.43 and 3.53µm. The latter two features show pronounced substructure which is very similar in the two sources. Comparison of the spectra of HD 97048 and Elias 1 with laboratory spectra of H-terminated diamond surfaces show excellent and very convincing agreement in peak position and spectral detail (Guillois et al., 1999ApJ...521L.133G). The position of the 3.53µm band indicates a temperature of ∼1000 K. An analysis of the radiative energy budget makes us conclude that the diamond carrier of the 3.53µm feature has typical sizes of 1-10 nm for HD 97048. A fit of the 3.53µm feature with a theoretical, calculated profile indicates that the emitting diamonds in HD 97048 see a FUV flux of 5.8x10–3[W/cm2]. The derived diamond mass, 1.5x10–10M, is only a tiny fraction of the total circumstellar dust mass and corresponds to only about 1 parts per billion relative to hydrogen. We discuss the origin of the diamond around these Herbig Ae/Be stars and conclude that most likely they are formed in situ. The implications for the nanodiamonds discovered in meteorites are also discussed.

Abstract Copyright:

Journal keyword(s): circumstellar matter - infrared: ISM: lines and bands - ISM: general - ISM: molecules, dust - ISM: individual: HD 97048, Elias 1

Simbad objects: 10

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Number of rows : 10
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 V* V892 Tau Ae* 04 18 40.6157618376 +28 19 15.625058880   16.6 14.69 14.35   A0Ve 281 0
2 IRAS 05341+0852 pA* 05 36 55.0511076432 +08 54 08.656315452   15.37 13.45 12.95 11.43 F6I 109 0
3 V* PS Gem pA* 07 03 39.6305052432 +10 46 13.068774048   7.76 7.37     A0 111 0
4 HD 89353 pA* 10 18 07.5899342712 -28 59 31.195183524   5.76 5.53     B9.5Ib/II 296 0
5 HD 97048 Ae* 11 08 03.3109731720 -77 39 17.490777444 9.03 8.76 9.00   8.64 A0Vep 501 0
6 NAME Cha T Association As* 11 10 16.7 -76 42 03           ~ 42 1
7 HD 100546 Be* 11 33 25.4408872296 -70 11 41.241297948   6.71 6.30   6.64 A0VaekB8_lB 722 1
8 Ass Cha T 2 As* 13 00 50.7 -77 34 26           ~ 19 1
9 HD 142527 Ae* 15 56 41.8882637904 -42 19 23.248281828   9.04 8.34     F6III 563 1
10 [D75b] Em* 21-021 PN 21 29 58.4711786760 +51 04 00.323924520   15.66 14.20 13.89   O7(f)/[WC11] 235 0

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2022.08.16-05:29:58

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