2008A&A...489.1151T


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.11CEST20:01:31

2008A&A...489.1151T - Astronomy and Astrophysics, volume 489, 1151-1155 (2008/10-3)

Spatially resolving the hot CO around the young Be star 51 Ophiuchi.

TATULLI E., MALBET F., MENARD F., GIL C., TESTI L., NATTA A., KRAUS S., STEE P. and ROBBE-DUBOIS S.

Abstract (from CDS):

51 Oph is one of the few young Be stars displaying a strong CO overtone emission at 2.3 microns in addition to the near infrared excess commonly observed in this type of stars. In this paper we first aim to locate the CO bandheads emitting region. Then, we compare its position with respect to the region emitting the near infrared continuum. We have observed 51 Oph with AMBER in low spectral resolution (R=35), and in medium spectral resolution (R=1500) centered on the CO bandheads. The medium resolution AMBER observations clearly resolve the CO bandheads. Both the CO bandheads and continuum emissions are spatially resolved by the interferometer. Using simple analytical ring models to interpret the measured visibilities, we find that the CO bandheads emission region is compact, located at 0.15–0.040.07AU from the star, and that the adjacent continuum is coming from a region further away (0.25–0.030.06AU). These results confirm the commonly invoked scenario in which the CO bandheads originate in a dust free hot gaseous disk. Furthermore, the continuum emitting region is closer to the star than the dust sublimation radius (by at least a factor two) and we suggest that hot gas inside the dust sublimation radius significantly contributes to the observed 2µm continuum emission.

Abstract Copyright:

Journal keyword(s): Techniques: interferometric - stars: individual: 51 Oph - planetary systems: protoplanetary disks

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 * alf Tau LP? 04 35 55.23907 +16 30 33.4885 4.32 2.40 0.86 -0.37 -1.31 K5+III 1196 1
2 HD 58647 Em* 07 25 56.0988044433 -14 10 43.548997982 6.81 6.92 6.85 6.73 6.73 B9IV 77 0
3 * 31 Lyn LP* 08 22 50.1099966 +43 11 17.272427 7.71 5.80 4.25 3.05 2.17 K4+III 146 0
4 * c Oph Be* 17 31 24.9541340 -23 57 45.513592 4.75 4.81 4.81 4.74 4.72 A0V 258 0
5 * gam Dra * 17 56 36.36988 +51 29 20.0242 5.630 3.760 2.230 1.08 0.23 K5III 523 0
6 * 4 Sgr PM* 17 59 47.5513229478 -23 48 58.026944408   4.698 4.724     A0 87 0
7 HD 170499 * 18 30 53.6674235265 -27 57 06.320324920   9.58 7.73     K4III 11 0
8 HD 172051 ** 18 38 53.4015065712 -21 03 06.741519593   6.518 5.860     G6V 175 1

    Equat.    Gal    SGal    Ecl

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2021.05.11-20:01:31

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