2009A&A...496..777N


Query : 2009A&A...496..777N

2009A&A...496..777N - Astronomy and Astrophysics, volume 496, 777-786 (2009/3-4)

Edge-on disk around the T Tauri star [MR81] Hα 17 NE in Corona Australis.

NEUHAEUSER R., KRAEMER S., MUGRAUER M., KOEHLER R., SCHMIDT T.O.B., AMMLER-VON EIFF M., ALVES J., FIEDLER S. and VOGT N.

Abstract (from CDS):

Using the speckle camera SHARP at the 3.5m ESO NTT, Koehler and collaborators found an object ∼3.5mag fainter in K only 1.3'' north-east of the T Tauri star [MR81] Hα17 in the Corona Australis (CrA) star-forming region, which could be either a brown dwarf or a T Tauri star with an edge-on disk. We attempt to study this faint object in detail. We acquired deep VLT NACO near-infrared images at three epochs to determine, whether [MR81] Hα17 and the nearby faint object are comoving and to measure the infrared colors of both objects. We obtained optical and infrared spectra of both objects with the VLT using FORS and ISAAC, respectively, to determine spectral types and temperatures as well as ages and masses. The T Tauri star [MR81] Hα17 and the faint nearby object have a projected separation of 1369.58 mas, i.e. 178 AU at 130pc. They share the same proper motion (∼5σ), so that they most certainly form a bound binary pair. The apparently fainter component [MR81] Hα17 NE has a spectral type of M2e, while the apparently brighter component [MR81] Hα17 SW, the previously known T Tauri star, has a spectral type of M4-5e. We can identify a nearly edge-on disk around [MR81] Hα17 NE by visual inspection, which has a diameter of at least 30 to 50AU. We are able to detect strong emission lines in [MR81] Hα17 NE, which are almost certainly due to ongoing accretion. The NE object is detectable only by means of its scattered light. If both objects are co-eval (2-3Myr) and located at the same distance (∼130pc as CrA), then the apparently fainter [MR81] Hα17 NE is more massive (primary) component with a nearly edge-on disk and the apparently brigther component [MR81] Hα17 SW is less massive (companion). Both are low-mass T Tauri stars with masses of ∼0.5 and 0.23±0.05M, respectively.

Abstract Copyright:

Journal keyword(s): astrometry - stars: binaries: visual - stars: formation - stars: pre-main sequence

Nomenclature: Fig. 3, Text: [MR81] HA 17 cc2.

Simbad objects: 18

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Number of rows : 18
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 V* BU Ari Or* 02 56 07.9958860128 +20 03 24.205352688   15.14 14.15 14.50   M1:IIIe 54 1
2 V* T Tau TT* 04 21 59.4319873992 +19 32 06.432393336   11.22 10.12 9.80   K0IV/Ve 1364 1
3 V* V1213 Tau Or* 04 31 37.5055489536 +18 12 24.383952396           K7 540 0
4 V* HK Tau TT* 04 31 50.5715875272 +24 24 17.775307548 16.81 16.689 15.292     M0.5 319 1
5 V* HV Tau C TT* 04 38 35.5125950280 +26 10 41.316576204         14.90 K6 91 0
6 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3923 0
7 HD 132347 ** 14 59 29.23211 -30 42 41.5076           A3mA5-F0 23 0
8 NAME Lupus Complex SFR 16 03 -38.1           ~ 606 0
9 WRAY 16-203 Or* 16 08 29.7275063376 -39 03 11.024360496   16.26 15.91 15.38 15.69 K0: 159 1
10 Sz 106 Y*O 16 08 39.7597402848 -39 06 25.321212288   15.1   15.00 14.66 M2.5 39 0
11 V* V1192 Sco Or* 16 08 51.4348063536 -39 05 30.460358652     21.9 18.97 18.18 M5 65 0
12 [RR90] Oph 2320.8-1721 Y*O 16 26 22.26912 -24 24 07.0632           M8 68 0
13 BKLT J162813-243139 Y*O 16 28 13.6972712208 -24 31 39.845643564           ~ 56 0
14 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 12908 0
15 2MASS J19013357-3700304 Y*O 19 01 33.5761986624 -37 00 30.453110028           M6.5 44 0
16 NAME Corona Australis Cloud MoC 19 01 51 -36 58.9           ~ 437 0
17 [MR81] HA 17 TT* 19 10 43.3789302408 -36 59 09.345472548   18.1 16.9     ~ 12 0
18 NAME CrA Complex reg 19 15 00.0 -37 30 00           ~ 105 1

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2022.05.24-23:48:55

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