2017A&A...608A..78G

Query : 2017A&A...608A..78G

2017A&A...608A..78G - Astronomy and Astrophysics, volume 608A78-78 (2017/12-1)

The wind and the magnetospheric accretion onto the T Tauri star S Coronae Australis at sub-au resolution.

GRAVITY COLLABORATION, GARCIA LOPEZ R., PERRAUT K., CARATTI O GARATTI A., LAZAREFF B., SANCHEZ-BERMUDEZ J., BENISTY M., DOUGADOS C., LABADIE L., BRANDNER W., GARCIA P.J.V., HENNING T., RAY T.P., ABUTER R., AMORIM A., ANUGU N., BERGER J.P., BONNET H., BURON A., CASELLI P., CLENET Y., COUDE DU FORESTO V., DE WIT W., DEEN C., DELPLANCKE-STROBELE F., DEXTER J., ECKART A., EISENHAUER F., GARCIA DABO C.E., GENDRON E., GENZEL R., GILLESSEN S., HAUBOIS X., HAUG M., HAUSSMANN F., HIPPLER S., HUBERT Z., HUMMEL C.A., HORROBIN M., JOCOU L., KELLNER S., KERVELLA P., KULAS M., KOLB J., LACOUR S., LE BOUQUIN J.-B., LENA P., LIPPA M., MERAND A., MULLER E., OTT T., PANDURO J., PAUMARD T., PERRIN G., PFUHL O., RAMIREZ A., RAU C., ROHLOFF R.-R., ROUSSET G., SCHEITHAUER S., SCHOLLER M., STRAUBMEIER C., STURM E., THI W.F., VAN DISHOECK E., VINCENT F., WAISBERG I., WANK I., WIEPRECHT E., WIEST M., WIEZORREK E., WOILLEZ J., YAZICI S. and ZINS G.

Abstract (from CDS):

Aims. To investigate the inner regions of protoplanetary discs, we performed near-infrared interferometric observations of the classical T Tauri binary system S CrA.
Methods. We present the first VLTI-GRAVITY high spectral resolution (R ∼ 4000) observations of a classical T Tauri binary, S CrA (composed of S CrA N and S CrA S and separated by ∼1.4), combining the four 8m telescopes in dual-field mode.
Results. Our observations in the near-infrared K-band continuum reveal a disc around each binary component, with similar half-flux radii of about 0.1 au at d∼130pc, inclinations (i=28±3° and i=22±6°), and position angles (PA=0°±6° and PA=-2°±12°), suggesting that they formed from the fragmentation of a common disc. The S CrA N spectrum shows bright HeI and Brγ line emission exhibiting inverse P Cygni profiles, typically associated with infalling gas. The continuum-compensated Brγ line visibilities of S CrA N show the presence of a compact Brγ emitting region whose radius is about ∼0.06 au, which is twice as big as the truncation radius. This component is mostly tracing a wind. Moreover, a slight radius change between the blue- and red-shifted Brγ line components is marginally detected.
Conclusions. The presence of an inverse P Cygni profile in the HeI and Brγ lines, along with the tentative detection of a slightly larger size of the blue-shifted Brγ line component, hint at the simultaneous presence of a wind and magnetospheric accretion in S CrA N.

Abstract Copyright: © ESO, 2017

Journal keyword(s): stars: formation - circumstellar matter - ISM: jets and outflows - ISM: individual objects: S CrA - infrared: ISM - techniques: interferometric - techniques: interferometric

Simbad objects: 7

Full paper

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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	Sp type	#ref 1850 - 2026	#notes
1	V* DG Tau	TT*	04 27 04.6921275888	+26 06 16.060169268	13.57	13.97	10.50	12.28	K6Ve	1092	1
2	HD 176047	PM*	18 59 44.6463435528	-34 28 15.800099592		9.04	8.09		K0III	40	0
3	V* S CrA A	Or*	19 01 08.5923211008	-36 57 19.736351172					~	43	0
4	V* S CrA	Or*	19 01 08.597088	-36 57 19.89504		11.76	10.91	11.41	G0Ve+K0Ve	286	0
5	V* S CrA B	Y*O	19 01 08.6478545856	-36 57 20.880059148					~	32	0
6	HH 729A	HH	19 01 10.56	-36 57 32.4					~	9	0
7	HD 188787	PM*	19 58 13.3552062456	-36 41 12.936195096		7.30	6.95		F2V	34	0

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