2002A&A...389..589M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST21:47:15

2002A&A...389..589M - Astronomy and Astrophysics, volume 389, 589-602 (2002/7-2)

Molecular gas and star formation in Lynds 870.

MAO R.Q., YANG J., HENKEL C. and JIANG Z.B.

Abstract (from CDS):

We present molecular line and submillimeter dust continuum observations of the Lynds 870 cloud in the vicinity of IRAS 20231+3440. Two submillimeter cores, SMM1 and SMM2, are identified mapping the 870µm dust continuum and ammonia (NH3) emission. The total molecular mass is ∼70-110M. The northern core is warmer and denser than the southern one. Molecular outflows are discovered in both cores. In the northern one a significant amount of low velocity (1.3-2.8km/s) outflowing gas is found, that is hidden in the relatively broad CO lines but that is revealed by the narrower HCO+ spectra. While IRAS 20231+3440 is most likely the exciting star of the northern outflow, the driving source of the southern outflow is not detected by infrared surveys and must be deeply embedded in the cloud core. Large scale (∼0.2pc) infall motion is indicated by blue asymmetric profiles observed in the HCO+ J=3-2 spectra. Red Ks band YSO candidates revealed by the 2MASS survey indicate ongoing star formation throughout the cloud. The calculated masses and the measured degree of turbulence are also reminiscent of clouds forming groups of stars. The excitation of the molecular lines, molecular abundances, and outflow properties are discussed. It is concluded that IRAS 20231+3440 is a Class I object, while the southern core most likely contains a Class 0 source.

Abstract Copyright:

Journal keyword(s): ISM: jets and outflows - ISM: molecules - stars: formation - ISM: individual: Lynds 870, IRAS 20231+3440

Nomenclature: [MYH2002] SMM N (Nos 1-2). Table 3: [MYH2002] IRS N (No. 1), [MYH2002] NN (Nos 2-12).

Simbad objects: 20

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Number of rows : 20

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3478 0
2 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2001 1
3 OH 34.26 +0.15 SFR 18 53 18.54 +01 14 57.9           ~ 460 0
4 * chi Cyg S* 19 50 33.9243904 +32 54 50.609683 7.02 6.06 4.24 1.81 -0.01 S6-9/1-2e 663 0
5 2MASS J20245838+3449390 IR 20 24 58.39 +34 49 39.0           ~ 1 0
6 2MASS J20250293+3446131 IR 20 25 02.94 +34 46 13.2           ~ 1 0
7 2MASS J20250342+3451210 IR 20 25 03.42 +34 51 21.0           ~ 1 0
8 2MASS J20250434+3450082 IR 20 25 04.34 +34 50 08.2           ~ 1 0
9 2MASS J20250482+3450141 IR 20 25 04.83 +34 50 14.2           ~ 1 0
10 2MASS J20250521+3452134 IR 20 25 05.22 +34 52 13.4           ~ 1 0
11 2MASS J20250561+3447360 IR 20 25 05.62 +34 47 36.0           ~ 1 0
12 [MYH2002] SMM 1 Y*O 20 25.1 +34 51           ~ 3 1
13 2MASS J20250667+3449149 IR 20 25 06.67 +34 49 15.0           ~ 1 0
14 2MASS J20250708+3449310 IR 20 25 07.08 +34 49 31.1           ~ 1 0
15 IRAS 20231+3440 HII 20 25 07.24 +34 50 05.3           ~ 16 1
16 2MASS J20250738+3449566 IR 20 25 07.39 +34 49 56.6           ~ 2 0
17 2MASS J20250744+3451235 IR 20 25 07.45 +34 51 23.5           ~ 1 0
18 [MYH2002] SMM 2 smm 20 25.2 +34 49           ~ 2 0
19 LDN 870 DNe 20 37.0 +35 11           ~ 7 0
20 NGC 7027 PN 21 07 01.8 +42 14 10   9.1 10.9     ~ 2322 1

    Equat.    Gal    SGal    Ecl

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2020.07.04-21:47:15

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