2005A&A...440.1105S


Query : 2005A&A...440.1105S

2005A&A...440.1105S - Astronomy and Astrophysics, volume 440, 1105-1118 (2005/9-4)

Spatially resolving the accretion shocks on the rapidly-rotating M0 T-Tauri star MN Lupi.

STRASSMEIER K.G., RICE J.B., RITTER A., KUEKER M., HUSSAIN G.A.J., HUBRIG S. and SHOBBROOK R.

Abstract (from CDS):

We obtained high-resolution, high-quality VLT/UVES spectra to reconstruct the two-dimensional surface structure of the rapidly-rotating classical T-Tauri star MN Lupi on two separate nights. Both surface maps show a structured warm (5000K) band centered around the pole at a latitude of ≃65°. Located within the band are two hot spots with temperatures of approximately or possibly even in excess of 5800K, i.e. 2000K above the effective photospheric temperature. Both maps appear with an adjacent equatorial band of temperature 3400K, some 400-500K below the effective photospheric temperature. While we interpret the two hot spots and the warm high-latitude band to be the heating points from two accretion impacts at the time of our observations and their redistributed energy trailed due to the fast stellar rotation, respectively, the cool equatorial band may not be cool after all but due to obscuration of the stellar surface by the innermost region of the disk. The fact that the hot spots appear at high stellar latitude is in agreement with the magnetospheric accretion model that proposes material funnelling onto the star along a predominantly dipolar magnetic field at roughly 50° latitude. The evidence of ongoing disk accretion, together with the very fast rotation of MN Lupi of just 3-4 times below its break-up velocity, suggests that the accretion mechanism is the cause of its rapid surface rotation. We present a model of magnetic star-disk coupling for MN Lupi that predicts a polar surface magnetic field of ≃3kG.

Abstract Copyright:

Journal keyword(s): stars: activity - starspots - stars: imaging - stars: individual: MN Lup - stars: individual: T Tauri - stars: pre-main sequence

CDS comments: Paragraph 2.2. HD 209920 is a misprint for HD 209290

Simbad objects: 15

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Number of rows : 15
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* BP Tau Or* 04 19 15.8339827632 +29 06 26.926959492   13.13 12.12 11.89   K5/7Ve 632 0
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* DF Tau TT* 04 27 02.7932020080 +25 42 22.453341516 11.97 12.25 11.42 10.31 9.14 M3Ve 476 1
4 V* SU Aur Or* 04 55 59.3866872552 +30 34 01.499608092   10.33 9.30 9.17   G2IIIne 562 0
5 HD 119850 Er* 13 45 43.7755597223 +14 53 29.471707437 10.989 9.894 8.50 7.465 6.363 M2V 320 0
6 HD 131976 SB* 14 57 26.53330 -21 24 41.5778 10.759 9.559 8.065 7.075 9.02 M1.5V 234 1
7 V* MN Lup TT* 15 23 30.3994838448 -38 21 28.841024628     14.15     M0 24 0
8 HD 136736 * 15 23 42.0454232328 -38 25 37.343221752   10.60 9.32     K2III 4 0
9 V* RU Lup Or* 15 56 42.3108692112 -37 49 15.473946900 9.27 10.07 9.60     K7/M0e 425 0
10 NAME Lupus Complex SFR 16 03 -38.1           ~ 607 0
11 HD 196795 BY* 20 39 37.70965 +04 58 19.3401 10.218 9.084 7.842 7.065 6.382 K5V 162 0
12 V* AX Mic Er* 21 17 15.2690680973 -38 52 02.503938581   8.09 6.68     M1V 212 0
13 HD 209290 PM* 22 02 10.2750978279 +01 24 00.832158070 11.838 10.616 9.146 8.213 7.245 M0.5V 213 0
14 V* HK Aqr BY* 23 08 19.5510173448 -15 24 35.766079704 13.4 12.282 10.872 9.964 9.019 M0Ve 195 0
15 BD+19 5116 ** 23 31 52.17898 +19 56 14.1505 12.737 11.749 10.165 8.982 7.446 M4+M5 434 0

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2022.05.27-05:59:22

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