2006A&A...446.1021V


C.D.S. - SIMBAD4 rel 1.7 - 2019.08.24CEST21:08:58

2006A&A...446.1021V - Astronomy and Astrophysics, volume 446, 1021-1026 (2006/2-2)

Post-outburst radio observation of the region around McNeil's nebula (V1647 Orionis).

VIG S., GHOSH S.K., KULKARNI V.K. and OJHA D.K.

Abstract (from CDS):

We present post-outburst (∼100 days after outburst) radio continuum observation of the region (∼30'x30') around McNeil's nebula (V1647 Orionis). The observations were carried out using the Giant Metrewave Radio Telescope (GMRT), India, at 1272 MHz on 2004 Feb. 14.5 UT. Although 8 sources have been detected within a circular diameter of 25' centred on V1647 Ori, we did not detect any radio continuum emission from McNeil's nebula. We assign a 5σ upper limit of 0.15mJy/beam for V1647 Ori where the beam size is 5.6''x2.7''. Even at higher frequencies of 4.9 and 8.5GHz (VLA archival data), no radio emission has been detected from this region. Three scenarios, namely emission from a homogeneous HII region, ionised stellar wind and shock-ionised gas, are explored in the light of our GMRT upper-limit. For the case of a homogeneous HII region, the radius of the emitting region is constrained to be ≤26AU corresponding to a temperature ≥2500K, which is consistent with the reported radio and Hα emission. In the ionised stellar wind picture, our upper limit of radio emission translates to {dot}(M)/v< 1.2-1.8x10–10(M/yr)/(km/s). On the other hand, if the stellar wind shocks the dense neutral (molecular) cloud, the radio upper limit implies that the fraction of the wind encountering the dense obstacle is <50%. Based on a recent measurement of X-ray outburst and later monitoring, the expected radio emission has been estimated. Using our radio limit, the radius (≤36AU) and electron density (≥7.2x107cm–3) of the radio emitting plasma have been constrained using a two phase medium in pressure equilibrium for a volume filling factor of 0.9.

Abstract Copyright:

Journal keyword(s): stars: formation - stars: individual: V1647 Orionis - radio continuum: stars - stars: circumstellar matter

Nomenclature: Table 1: [VGK2006b] N (Nos 1-8).

Simbad objects: 16

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Number of rows : 16

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 ICRF J050321.1+020304 Sy2 05 03 21.19717510 +02 03 04.6763382   22.500 21.350 20.682   ~ 170 1
2 NAME Horsehead Nebula DNe 05 40 59.0 -02 27 30           ~ 427 0
3 NAME Flame Nebula HII 05 41 42.7 -01 54 44           ~ 690 1
4 NAME Ori B MoC 05 41 43.0 -01 54 44           ~ 1119 0
5 NVSS J054527-000547 Rad 05 45 27.26 -00 05 47.7           ~ 1 0
6 LDN 1630 DNe 05 45.5 -00 59           ~ 344 0
7 NVSS J054539+000458 Rad 05 45 39.42 +00 05 00.2           ~ 1 0
8 NVSS J054543-001400 Rad 05 45 43.93 -00 13 56.5           ~ 1 0
9 [VGK2006b] 4 Rad 05 45 51.72 -00 08 03.0           ~ 1 0
10 GBS-VLA J054557.81-000929.0 X 05 45 57.81 -00 09 29.0           ~ 8 0
11 V* V1647 Ori FU* 05 46 13.1370923766 -00 06 04.876812846     18.1     ~ 220 1
12 NAME McNeil Nebula RNe 05 46 14 -00 05.8           ~ 69 2
13 HH 23 HH 05 46 14.52 -00 03 30.8           ~ 24 0
14 NVSS J054629-001944 Rad 05 46 29.53 -00 19 41.4           ~ 1 0
15 NVSS J054640-001825 Rad 05 46 40.76 -00 18 23.8           ~ 1 0
16 NVSS J054644+000144 Rad 05 46 43.98 +00 01 41.7           ~ 1 0

    Equat.    Gal    SGal    Ecl

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2019.08.24-21:08:58

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