2010A&A...522A.106H


C.D.S. - SIMBAD4 rel 1.7 - 2019.09.23CEST03:45:50

2010A&A...522A.106H - Astronomy and Astrophysics, volume 522, A106-106 (2010/11-1)

Star formation in Cometary Globule 1: the second generation.

HAIKALA L.K., MAEKELAE M.M. and VAEISAENEN P.

Abstract (from CDS):

Cometary Globule 1 (CG 1) is the archetype Cometary Globule in the Gum nebula. We attempt to discover stars possibly embedded in the globule head of the Gum nebula and to map distribution of its ISM. We analyse C18O spectral line observations, NIR spectrosopy, narrow and broad band NIR imaging, and stellar photometry to determine the structure of the CG 1 head and the extinction of stars in its direction. A young stellar object (YSO) associated with a bright NIR nebulosity and a molecular hydrogen object (MHO 1411, a probable obscured HH-object) were discovered in the globule. Molecular hydrogen and Brγ line emission is seen in the direction of the YSO. The observed maximum optical extinction in the globule head is 9.2m. The peak N(H2) column density and the total mass derived from the extinction are 9.0x1021cm–2 and 16.7M(d/300pc)2. The C18O emission in the globule head is detected in a 1.5' by 4' area with a sharp maximum SW of the YSO. Three regions can be discerned in C18O line velocity and excitation temperature. Because of variations in the C18O excitation temperature the integrated C18O line emission does not follow the optical extinction. It is argued that the changes in the C18O excitation temperatures are caused by radiative heating by NX Pup and interaction of the YSO with the parent cloud. No indication of a strong molecular outflow from the YSO is evident in the molecular line data. The IRAS point source 07178-4429 located in the CG 1 head resolves into two sources in the HIRES enhanced IRAS images. The 12 and 25µm emission originates mainly in the star NX Puppis and the 60 and 100µm emission in the YSO.

Abstract Copyright:

Journal keyword(s): stars: formation - stars: pre-main sequence - dust, extinction - ISM: clouds - Herbig-Haro objects - infrared: stars

Nomenclature: Paragr. 4.4: MHO NNNN (No. 1411) added.

Simbad objects: 12

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Number of rows : 12

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 CG 1 CGb 07 19 21.5 -44 35 03           ~ 38 1
2 2MASS J07192185-4434551 IR 07 19 21.851 -44 34 55.12           ~ 2 0
3 IRAS 07178-4429 mul 07 19 25.8 -44 35 01           ~ 17 0
4 CD-44 3318 Ae* 07 19 28.2886716751 -44 35 11.235575735   10.47 9.99     A1e/F2IIIe 111 0
5 HD 61452 *iC 07 37 41.9770189922 -37 57 09.320719891   9.46 8.98     F7V 6 0
6 [DB2002b] G257.18-10.27 DNe 07 40 51.5 -43 49 12           ~ 15 1
7 NAME GUM Nebula ISM 07 43 -42.1           ~ 374 1
8 CG 12 CGb 13 57 42.2 -39 56 21           ~ 47 1
9 NGC 5367 RNe 13 57 44 -39 58.8           ~ 29 1
10 CD-39 8581 Ae* 13 57 44.12 -39 58 44.2   10.01 9.70     B4+B7 46 0
11 NAME CrA Dark Cloud MoC 19 01 51 -36 58.9           ~ 384 0
12 MHO 1411 EmO ~ ~           ~ 2 0

    Equat.    Gal    SGal    Ecl

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2019.09.23-03:45:50

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