2016A&A...590A..98H


C.D.S. - SIMBAD4 rel 1.7 - 2021.06.14CEST10:09:31

2016A&A...590A..98H - Astronomy and Astrophysics, volume 590A, 98-98 (2016/6-1)

A proposed new diagnostic for Herbig disc geometry. FWHM versus J of CO ro-vibrational lines.

HEIN BERTELSEN R.P., KAMP I., VAN DER PLAS G., VAN DEN ANCKER M.E., WATERS L.B.F.M., THI W.-F. and WOITKE P.

Abstract (from CDS):

Aims. The CO ro-vibrational lines observed from Herbig group II discs are often seen to be broad, while the same lines observed from group I discs are often narrow. This difference is not well understood. In this paper we explore the underlying cause for this difference and provide a pathway for a better understanding of the geometry and structure of the inner discs around Herbig Ae/Be stars.
Methods. High spectral resolution infrared spectra of CO ro-vibrational emission from six Herbig Ae/Be candidate stars were taken with the CRyogenic high-resolution InfraRed Echelle Spectrograph (CRIRES) at the Very Large Telescope (VLT). From these spectra, we produce individual and co-added CO ro-vibrational line profiles. We investigate line profile shape differences, and we explore the full width at half maximum (FWHM) variations with J quantum number in the context of disc geometry. Furthermore, we put our new sources into the context of earlier observed sources to study a large sample. For comparison, we also investigate the FWHM variations with J of modelled CO ro-vibrational lines from two typical disc geometries produced with the thermochemical disc modelling code ProDiMo.
Results. For our new observations of CO ro-vibrational lines, we find that the FWHM of individual lines are in the range of 10-60km/s. We find both narrow and broad single-peaked emission lines, but only Hen 2-80 displays double-peaked emission lines. For HD 250550, the FWHM of the CO lines increases with J value, indicating a radially extended emitting region, while Hen 2-80 shows a constant FWHM versus J behaviour, indicating a narrow emitting region. This qualitatively agrees with the two different modelled disc geometries. Comparing dust and gas inner disc geometries (inferred by the spectral energy distribution (SED) and CO ro-vibrational emission) for the expanded sample of observed Herbig discs, we find no clear correspondence between the SED (spectral energy distribution) groups of the sources and their inner CO radius.
Conclusions. The FWHM versus J is a potential new gas diagnostic for the inner disc with, for example, a constant FWHM versus J indicating the presence of a large gas hole or gap. Models and observations both indicate the potential of this new diagnostic. Our extended sample does not fully support the previous trend where group I discs have CO ro-vibrational emission lines with small FWHM. Instead, our CO ro-vibrational data from a handful of sources indicates different inner disc geometries for the gas and dust of these sources.

Abstract Copyright: © ESO, 2016

Journal keyword(s): infrared: stars - line: profiles - circumstellar matter - protoplanetary disks - stars: pre-main sequence

CDS comments: Paragraph 3. Th 35-101 is THA 35-II-101 in SIMBAD.

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 - 2021
#notes
1 EM* LkHA 330 TT* 03 45 48.2804487421 +32 24 11.851014679   12.30 10.97     F7 126 0
2 V* RY Tau Or* 04 21 57.4132838427 +28 26 35.533990877 10.82 10.34 9.30 9.67 8.87 K1IV/Ve 663 1
3 V* T Tau TT* 04 21 59.4323326335 +19 32 06.439974179   11.22 10.12 9.80   K0IV/Ve 1341 1
4 V* AB Aur Ae* 04 55 45.8459978418 +30 33 04.293281305 7.20 7.16 7.05 6.96 6.70 A0Ve 958 2
5 HD 31648 Ae* 04 58 46.2654165113 +29 50 36.990341242 7.84 7.78 7.62 7.76 7.43 A5Vep 415 0
6 V* RW Aur TT* 05 07 49.5662483 +30 24 05.177426   10.86 9.60 9.95   K1/5e+K5e 730 0
7 HD 36112 Ae* 05 30 27.5286772598 +25 19 57.082162439   8.57 8.27     A8Ve 388 0
8 Ass Ori OB 1c As* 05 35 21 -05 20.5           ~ 129 1
9 V* T Ori Ae* 05 35 50.4483740019 -05 28 34.923375739 12.724 11.637 11.248 10.09 10.043 A3IVeb 233 0
10 V* V883 Ori Or* 05 38 18.0974260202 -07 02 25.963144400   14.80       F:I: 122 0
11 HD 250550 Ae* 06 01 59.9894900068 +16 30 56.724889160   9.60 9.593 9.64   B9e 235 1
12 LDN 1586 DNe 06 05.9 +16 00           ~ 5 0
13 EM* MWC 137 Ae* 06 18 45.5220562759 +15 16 52.242746933 12.89 13.30 13.759 11.67 10.31 sgB[e]d 228 1
14 * gam Gem SB* 06 37 42.71050 +16 23 57.4095 1.98 1.92 1.92 1.86 1.87 A1.5IV+ 490 0
15 Ve 7-27 Em* 08 51 59.6873349537 -46 18 07.268122029   14.87 13.88 14.59 12.96 ~ 46 1
16 THA 35-II-101 Em* 10 45 57.1307540043 -59 56 43.139971716 11.54 12.25 11.550     Bep 27 0
17 HD 95881 Em* 11 01 57.6212785173 -71 30 48.313329972   8.37 8.23     A0 90 0
18 HD 97048 Ae* 11 08 03.3105687971 -77 39 17.491180130 9.03 8.76 9.00   8.64 A0Vep 474 0
19 HD 98922 Be* 11 22 31.6740564115 -53 22 11.456030308   6.80 6.76     B9Ve 117 1
20 HD 100453 Ae* 11 33 05.5765928993 -54 19 28.543792679   8.09 7.79     A9Ve 223 1
21 HD 100546 Be* 11 33 25.4404858122 -70 11 41.239343121   6.71 6.30   6.64 A0VaekB8_lB 678 1
22 HD 101412 Be* 11 39 44.4562795603 -60 10 27.717502041   9.465 9.288     A3VaekA0mA0_lB 122 0
23 V* DX Cha Ae* 12 00 05.0870448690 -78 11 34.559255151   6.81 6.60     A0_sh 313 0
24 WRAY 16-110 Ae* 12 22 23.1621616129 -63 17 16.880452567   13.88 13.08     B6Ve 42 0
25 * alf01 Cru * 12 26 35.896 -63 05 56.73   1.10 1.28     B0.5IV 139 0
26 CPD-36 6759 Y*O 15 15 48.4459023859 -37 09 16.026315179   9.21 8.708     F8V 381 1
27 Ass Sco OB 2-1 * 15 41.3 -25 24           ~ 5 0
28 2MASS J16271031-2419188 TT* 16 27 10.3139516221 -24 19 18.902407856           M4 10 1
29 WRAY 15-1520 Em* 16 38 28.6289404817 -45 23 41.454122514     13.3 13.14 12.00 Be 29 2
30 HD 150193 Be* 16 40 17.9242900066 -23 53 45.192676418 9.69 9.32 8.79 8.41   B9.5Ve 297 0
31 EM* AS 225 Em* 17 20 55.5372311636 -38 00 00.366458700   14.82 13.44 12.99   Be 12 0
32 * lam Sco bC* 17 33 36.52012 -37 06 13.7648 0.52 1.48 1.62     B2IV+DA7.9 376 1
33 HD 163296 Ae* 17 56 21.2882188601 -21 57 21.872343282 7.00 6.93 6.85 6.86 6.67 A1Vep 871 0
34 EM* MWC 297 Ae* 18 27 39.5266257570 -03 49 52.136526892 15.57 14.34 12.31 11.34   B1.5Ve 271 0
35 V* VV Ser Ae* 18 28 47.8619658319 +00 08 39.924642619 12.99 12.63 11.80 11.01 10.24 A5Ve 232 0
36 HD 179218 Ae* 19 11 11.2540715594 +15 47 15.632212730 7.55 7.476 7.39 7.25 7.21 A0Ve 225 0
37 HD 190073 Ae* 20 03 02.5098091524 +05 44 16.658081203 7.91 7.86 7.73   7.65 A2IVe 232 0

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2021.06.14-10:09:31

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