2016MNRAS.457.2236K


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.22CEST21:47:45

2016MNRAS.457.2236K - Mon. Not. R. Astron. Soc., 457, 2236-2251 (2016/April-1)

Probing the wind-launching regions of the Herbig Be star HD 58647 with high spectral resolution interferometry.

KUROSAWA R., KREPLIN A., WEIGELT G., NATTA A., BENISTY M., ISELLA A., TATULLI E., MASSI F., TESTI L., KRAUS S., DUVERT G., PETROV R.G. and STEE P.

Abstract (from CDS):

We present a study of the wind-launching region of the Herbig Be star HD 58647 using high angular (λ/2B=0.003 arcsec) and high spectral (R=12 000) resolution interferometric Very Large Telescope Interferometer (VLTI)-Astronomical Multi-Beam combiner (AMBER) observations of the near-infrared hydrogen emission line, Brγ. The star displays double peaks in both Brγ line profile and wavelength-dependent visibilities. The wavelength-dependent differential phases show S-shaped variations around the line centre. The visibility level increases in the line (by ∼0.1) at the longest projected baseline (88 m), indicating that the size of the line emission region is smaller than the size of the K-band continuum-emitting region, which is expected to arise near the dust sublimation radius of the accretion disc. The data have been analysed using radiative transfer models to probe the geometry, size and physical properties of the wind that is emitting Brγ. We find that a model with a small magnetosphere and a disc wind with its inner radius located just outside of the magnetosphere can well reproduce the observed Brγ profile, wavelength-dependent visibilities, differential and closure phases, simultaneously. The mass-accretion and mass-loss rates adopted for the model are and , respectively (). Consequently, about 60 per cent of the angular momentum loss rate required for a steady accretion with the measured accretion rate is provided by the disc wind. The small magnetosphere in HD 58647 does not contribute to the Brγ line emission significantly.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): line: profiles - radiative transfer - circumstellar matter - stars: individual: HD 58647 - stars: pre-main sequence - stars: winds, outflows

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 V* DG Tau TT* 04 27 04.6913654419 +26 06 16.041555299 13.57 13.97 10.50 12.28   K6Ve 900 1
2 V* UX Ori Ae* 05 04 29.9881676817 -03 47 14.288047238 10.25 10.93 8.70 9.62 9.43 A4IVe 327 1
3 HD 50138 Ae* 06 51 33.3989891154 -06 57 59.445949919 6.28 6.68 6.67     A1Ib/II 195 0
4 V* Z CMa Ae* 07 03 43.1588002461 -11 33 06.230351311 10.51 9.99 8.80     B5/8eq+F5/7 518 3
5 HD 57939 * 07 22 48.8176558557 -16 43 34.497706322   8.33 7.34     K0III 6 0
6 HD 58647 Em* 07 25 56.0988044433 -14 10 43.548997982 6.81 6.92 6.85 6.73 6.73 B9IV 69 0
7 HD 98922 Be* 11 22 31.6740564115 -53 22 11.456030308   6.80 6.76     B9Ve 110 1
8 HD 100564 V* 11 34 21.2736 -03 30 12.899   10.132 9.750     F3/5V 9 0
9 CD-42 11721 Be* 16 59 06.7622892572 -42 42 08.404916931 12.16 12.28 11.00     B0IVe 152 1
10 HD 163296 Ae* 17 56 21.2882188601 -21 57 21.872343282 7.00 6.93 6.85 6.86 6.67 A1Vep 729 0
11 EM* MWC 297 Ae* 18 27 39.5266257570 -03 49 52.136526892 15.57 14.34 12.31 11.34   B1.5Ve 260 0

    Equat.    Gal    SGal    Ecl

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2019.10.22-21:47:45

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