2013A&A...550A..65S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST07:58:12

2013A&A...550A..65S - Astronomy and Astrophysics, volume 550A, 65-65 (2013/2-1)

Evidence of an asymmetrical keplerian disk in the Brγ and He I emission lines around the Be star HD 110432.

STEE P., MEILLAND A., BENDJOYA P., MILLOUR F., SMITH M., SPANG A., DUVERT G., HOFMANN K.-H. and MASSI F.

Abstract (from CDS):

HD 110432 was classified as a ``γ Cas X-ray analog'' since it has similar peculiar X-ray and optical characteristics, i.e. a hard-thermal X-ray variable emission and an optical spectrum affected by an extensive disk. It might be a Be star harboring an accreting white dwarf or that the X-rays may come from an interaction between the surface of the star and its disk. To investigate the disk around this Be star we used the VLTI/AMBER instrument, which combines high spectral (R=12000) and high spatial (θmin=4mas) resolutions. We constrain the geometry and kinematics of its circumstellar disk from the highest spatial resolution ever achieved on this star. We obtain a disk extension in the Brγ line of 10.2D* and 7.8D* in the HeI line at 2.05µm assuming a Gaussian disk model. The disk is clearly following a Keplerian rotation. We obtained an inclination angle of 55°, and the star is a nearly critical rotator with Vrot/Vc=1.00±0.2. This inclination is greater than the value found for γ Cas (about 42°), and is consistent with the inference from optical FeII emission profiles that the inclination should be more than the γ Cas value. In the near-IR continuum, the disk of HD 110432 is 3 times larger than γ Cas's disk. We have no direct evidence of a companion around HD 110432, but it seems that we have a clear signature for disk inhomogeneities as detected for ζ Tau. This asymmetrical disk detection may be interpreted within the one-armed oscillation viscous disk framework. Another finding is that the disk size in the near-IR is similar to other Be stars with different spectral types and thus may be independent of the stellar parameters, as found for classical Be stars.

Abstract Copyright:

Journal keyword(s): instrumentation: interferometers - circumstellar matter - stars: individual: HD 110432 - stars: emission-line, Be - stars: winds, outflows

Simbad objects: 9

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Number of rows : 9

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 * gam Cas Be* 00 56 42.5317 +60 43 00.265 1.18 2.29 2.39 2.32 2.40 B0.5IVpe 1137 2
2 * zet Tau Be* 05 37 38.6854231 +21 08 33.158804 2.22 2.84 3.03 3.06 3.15 B1IVe_shell 695 0
3 * alf Col Be* 05 39 38.9410319 -34 04 26.794991 2.10 2.53 2.65 2.65 2.74 B9Ve 225 0
4 NAME Coalsack Nebula DNe 12 31 19 -63 44.6           ~ 242 0
5 NGC 4609 OpC 12 42 18 -62 59.7   7.32 6.9     ~ 66 0
6 HD 110432 Be* 12 42 50.2655719413 -63 03 31.048323668 4.79 5.58 5.31     B0.5IVpe 269 0
7 HD 113752 * 13 06 37.7943762553 -54 30 21.435548639   8.41 7.02     K2/3III 7 0
8 * del Sco SB* 16 00 20.00528 -22 37 18.1431 1.30 2.20 2.32 2.36 2.49 B0.3IV 692 0
9 * alf Ara Be* 17 31 50.4915282 -49 52 34.122041 2.09 2.78 2.95 3.05 3.29 B2Vne 245 0

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2020.07.13-07:58:12

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