2007A&A...464...73M

Query : 2007A&A...464...73M

2007A&A...464...73M - Astronomy and Astrophysics, volume 464, 73-79 (2007/3-2)

An asymmetry detected in the disk of κ Canis Majoris with AMBER/VLTI.

MEILLAND A., MILLOUR F., STEE P., DOMICIANO DE SOUZA A., PETROV R.G., MOURARD D., JANKOV S., ROBBE-DUBOIS S., SPANG A., ARISTIDI E., ANTONELLI P., BECKMANN U., BRESSON Y., CHELLI A., DUGUE M., DUVERT G., GENNARI S., GLUECK L., KERN P., LAGARDE S., LE COARER E., LISI F., MALBET F., PERRAUT K., PUGET P., RANTAKYROE F., ROUSSEL A., TATULLI E., WEIGELT G., ZINS G., ACCARDO M., ACKE B., AGABI K., ALTARIBA E., AREZKI B., BAFFA C., BEHREND J., BLOECKER T., BONHOMME S., BUSONI S., CASSAING F., CLAUSSE J.-M., COLIN J., CONNOT C., DELBOULBE A., DRIEBE T., FEAUTRIER P., FERRUZZI D., FORVEILLE T., FOSSAT E., FOY R., FRAIX-BURNET D., GALLARDO A., GIANI E., GIL C., GLENTZLIN A., HEIDEN M., HEININGER M., HERNANDEZ UTRERA O., HOFMANN K.-H., KAMM D., KIEKEBUSCH M., KRAUS S., LE CONTEL D., LE CONTEL J.-M., LESOURD T., LOPEZ B., LOPEZ M., MAGNARD Y., MARCONI A., MARS G., MARTINOT-LAGARDE G., MATHIAS P., MEGE P., MONIN J.-L., MOUILLET D., NUSSBAUM E., OHNAKA K., PACHECO J., PERRIER C., RABBIA Y., REBATTU S., REYNAUD F., RICHICHI A., ROBINI A., SACCHETTINI M., SCHERTL D., SCHOELLER M., SOLSCHEID W., STEFANINI P., TALLON M., TALLON-BOSC I., TASSO D., TESTI L., VAKILI F., VON DER LUEHE O., VALTIER J.-C., VANNIER M. and VENTURA N.

Abstract (from CDS):

We study the geometry and kinematics of the circumstellar environment of the Be star κ CMa in the Brγ emission line and its nearby continuum. We use the AMBER/VLTI instrument operating in the K band, which provides a spatial resolution of about 6mas with a spectral resolution of 1500, to study the kinematics within the disk and to infer its rotation law. To obtain more kinematical constraints we also use a high spectral resolution Paβ line profile obtain in December 2005 at the Observatorio do Pico do Dios, Brazil and we compile V/R line profile variations and spectral energy distribution data points from the literature. Using differential visibilities and differential phases across the Brγ line we detect an asymmetry in the disk. Moreover, we found that κ CMa seems difficult to fit within the classical scenario for Be stars, illustrated recently by α Arae observations, i.e. a fast rotating B star close to its breakup velocity surrounded by a Keplerian circumstellar disk with an enhanced polar wind. We discuss the possibility that κ CMa is a critical rotator with a Keplerian rotating disk and examine whether if the detected asymmetry can be interpreted within the ``one-armed'' viscous disk framework.

Abstract Copyright: ∼

Journal keyword(s): techniques: high angular resolution - techniques: interferometric - stars: emission-line, Be - stars: individual : Keplerian rotation - stars: individual: κ CMa - stars: circumstellar matter

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 * gam Cas HXB 00 56 42.5310945 +60 43 00.264089 1.18 2.29 2.39 2.32 2.40 B0.5IVpe 1209 0
2 * alf Eri Be* 01 37 42.84548 -57 14 12.3101 -0.36 0.30 0.46 0.49 0.60 B6Vpe 473 1
3 * zet Tau Be* 05 37 38.6854231 +21 08 33.158804 2.22 2.84 3.03 3.06 3.15 B1IVe_shell 730 0
4 * kap CMa Be* 06 49 50.4591124672 -32 30 30.523820933 2.73 3.68 3.89 3.91 4.05 B1.5Ve 286 0
5 * a Vel * 08 46 01.6443407807 -46 02 29.501411244 3.86 3.91 3.91 3.86 3.73 A0II 60 0
6 * tet Car SB* 10 42 57.4019674 -64 23 40.020796 1.53 2.54 2.76 2.87 3.10 B0Vp 340 0
7 * alf Ara Be* 17 31 50.4915282 -49 52 34.122041 2.09 2.78 2.95 3.05 3.29 B2Vne 255 0

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