# 1998A&A...339..575F

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 Query : 1998A&A...339..575F

1998A&A...339..575F - Astronomy and Astrophysics, volume 339, 575-586 (1998/11-2)

The biconical cavity associated with HD 200775: the formation of a cometary nebula.

FUENTE A., MARTIN-PINTADO J., RODRIGUEZ-FRANCO A. and MORIARTY-SCHIEVEN G.

Abstract (from CDS):

We have observed with high angular resolution (10''-24'') an area of ≃18'x15' around HD 200775 in the J=2->1 line of 12CO and the J=1->0 lines of 13CO and C18O. An interferometric HI 21cm image with similar angular resolution (14'') is also presented. Molecular observations show that the star is located in a biconical cavity that has been very likely excavated by an energetic and bipolar outflow in an earlier evolutionary stage. The star is not located at the apex of this cavity but ∼50'' towards the eastern lobe. At the present stage, there is no evidence for high velocity gas within the lobes of the cavity. However, the morphology of the HI emission, two filaments arranged in a >'' shape feature, and the bow shock located at the tip of one of these filaments, show that high velocity atomic gas is outflowing in a shell adjacent to the walls of the cavity in the eastern lobe. Since this high velocity atomic gas has not been detected in the western lobe, the outflow has a cometary shape. We propose that this outflow is formed when the atomic gas in the inner walls of the cavity is accelerated by the stellar wind. The cometary shape is due to the off-center position of the star. This cometary HI region constitutes the latest evolutionary stage of the bipolar outflow associated with HD 200775. Based on these results we propose a simple model to explain the formation of cometary nebulae in massive star forming regions.

Journal keyword(s): stars: individual: HD 200775 - stars: pre-main-sequence - ISM: jets and outflows - ISM: individual objects: NGC 7023 - reflection nebulae - radio lines: ISM

 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 LDN 1448 DNe 03 22.5 +30 35           ~ 496 0
2 RAFGL 490 Y*O 03 27 38.7928952784 +58 47 00.025298088           ~ 347 0
3 NAME HH 7-11 FIR 03 29 03.9 +31 16 06           ~ 343 0
4 V* T Tau TT* 04 21 59.4319873992 +19 32 06.432393336   11.22 10.12 9.80   K0IV/Ve 1364 1
5 LDN 1551 DNe 04 31 30.0 +18 12 30           ~ 789 1
6 HH 243 HH 05 32 27.83 +12 53 14.6   17.0       ~ 117 0
7 V* FU Ori Or* 05 45 22.3647842544 +09 04 12.291320064   10.72 9.60     F0Iab 759 1
8 [PGS81] IRS 1 Y*O 05 47 04.78 +00 21 42.8           ~ 76 0
9 V* R Mon Ae* 06 39 09.9542000448 +08 44 09.539482632 10.76 12.46 11.85 10.96 10.25 B8IIIe 510 0
10 NGC 2264 OpC 06 40 52 +09 52.6           ~ 1682 0
11 GRS G081.70 +00.50 SFR 20 39 01.6 +42 19 38           O4.5 1001 0
12 NGC 7023 RNe 21 01 36.9 +68 09 48           ~ 663 0
13 HD 200775 Ae* 21 01 36.9205762896 +68 09 47.789578836 7.34 7.754 7.427 8.13   B2Ve 531 0
14 NGC 7020 GiG 21 11 20.0452941264 -64 01 31.011326832   12.81 11.48 11.27   ~ 72 0
15 NAME SH 2-140 IRS 1 Y*O 22 19 18.277 +63 18 45.82           ~ 194 0

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2022.05.20-18:51:00