2004ApJ...601..952S

Query : 2004ApJ...601..952S

2004ApJ...601..952S - Astrophys. J., 601, 952-961 (2004/February-1)

The nature of the massive young stars in W75 N.

SHEPHERD D.S., KURTZ S.E. and TESTI L.

Abstract (from CDS):

We have observed the W75 N massive star forming region in SiO (J=2-1 and J=1-0) at 3"-5" resolution and in 6 cm, 2 cm, and 7 mm continuum emission at 1".4-0".2 resolution. The abundance ratio of [SiO]/[H2]∼5-7x10–11 is typical for what is expected in the ambient component of molecular clouds with active star formation. The SiO morphology is diffuse and centered on the positions of the ultracompact H II regions–no collimated, neutral jet was discovered. The ionized gas surrounding the protostars has emission measures ranging from 1 to 15x106 pc/cm6, densities from 0.4 to 5x104/cm3, and derived spectral types of the central ionizing stars ranging from B0.5 to B2. Most of the detected sources have spectral indices that suggest optically thin to moderately optically thick H II regions produced by a central ionizing star. The spread in ages between the oldest and youngest early-B protostars in the W75 N cluster is 0.1-5x106 yr. This evolutionary timescale for W75 N is consistent with that found for early-B stars born in clusters forming more massive stars (M*>25M☉).

Abstract Copyright: ∼

Journal keyword(s): Stars: Circumstellar Matter - ISM: H II Regions - ISM: Jets and Outflows - Stars: Formation - Stars: Mass Loss

CDS comments: IRAS 20126+4014 is a misprint for IRAS 20126+4104, parag. 2.2 : quasar 2012+464 (J2012+464?) not identified

Simbad objects: 28

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Number of rows : 28
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 LDN 1448 DNe 03 22.5 +30 35           ~ 546 0
2 HH 211 Y*O 03 43 56.52 +32 00 52.8           ~ 414 0
3 4C 76.03 rG 04 10 45.61079426 +76 56 45.3130641   21 22.0 21.200   ~ 164 1
4 GAL 192.16-03.82 HII 05 58 13.4 +16 32 00           ~ 145 1
5 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
6 NAME HH 80-81 HH 18 19 06 -20 51.4           ~ 236 0
7 IRAS 20126+4104 Y*O 20 14 25.8816769656 +41 13 36.879427236           B2.5-B0.5 469 0
8 [S2001] MM 8 mm 20 38 33.68 +42 38 01.7           ~ 2 0
9 [YST88] IRS 2 Y*O 20 38 35.37 +42 37 13.7           ~ 11 0
10 NAME Cyg X FIR 33 Y*O 20 38 35.9 +42 37 22           B1.5 423 1
11 [S2001] MM 2 mm 20 38 35.92 +42 37 32.1           ~ 14 0
12 [S2001] MM 4 mm 20 38 36.30 +42 37 29.9           ~ 5 0
13 [S2001] MM 6 mm 20 38 36.31 +42 37 55.9           ~ 2 0
14 [S2001] MM 1 mm 20 38 36.39 +42 37 34.1           ~ 17 0
15 NAME W75N(B) cor 20 38 36.44 +42 37 34.1           ~ 52 0
16 [HRB81] W75N(Ba) HII 20 38 36.445 +42 37 34.82           ~ 55 0
17 [TGR97] VLA 2 HII 20 38 36.482 +42 37 34.08           ~ 63 0
18 [HRB81] W75N(Bb) HII 20 38 36.486 +42 37 33.44           ~ 38 0
19 [HRB81] W75N(Bc) Rad 20 38 36.533 +42 37 32.04           ~ 10 0
20 [S2001] MM 7 mm 20 38 36.56 +42 38 12.7           ~ 2 0
21 [DKS2007] W75N-IRS 1 IR 20 38 36.76 +42 37 29.4           ~ 17 0
22 [S2001] MM 3 mm 20 38 37.05 +42 37 37.4           ~ 14 0
23 [HRB81] W75N(A) HII 20 38 37.6 +42 38 00           ~ 10 0
24 [S2001] MM 5 mm 20 38 37.78 +42 37 59.0           ~ 4 0
25 [S2001] MM 9 mm 20 38 38.70 +42 38 19.8           ~ 3 0
26 [HRB81] W75N(C) HII 20 38 39.1 +42 36 51           ~ 8 0
27 NAME BL Lac BLL 22 02 43.2913536816 +42 16 39.979416792   15.66 14.72     ~ 2397 1
28 NAME Cep A HW 2 Y*O 22 56 17.9 +62 01 49           B0.5 243 0

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