Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.atnf.csiro.au/research/masermeeting/web_papers/402_Deguchi.pdf Дата изменения: Fri Mar 23 03:48:00 2007 Дата индексирования: Sun Dec 23 11:05:27 2007 Кодировка: Поисковые слова: m 43

SiO Maser Survey of Evolved Stars in the Galaxy:
Various Environments of Maser Sources

Shuji Deguchi

(Nobeyama Radio Obs.)

Fujii, Imai, Ita, Izumiura, Kameya, Matsunaga, Miyazaki, Nakada, & Nakashima


Nobeyama Radio Observatory



45-m telescope
22-115 GHz Beam 40" at 43 GHz 90" at 22 GHz 15" at 115 GHz Tsys=200 K (2GHz bandwidth w HEMT) SiO J=1-0 v=1 and 2 (v=0, 3) too at 43.122 and 42.820 GHz 29SiO 42.879 GHz H53alpha 42.951 GHz (HOCO+ 202-101 42.767 GHz)






Nobeyama Radio Observatory



45-m telescope
22-115 GHz Beam 40" at 43 GHz 90" at 22 GHz 15" at 115 GHz Tsys=200 K (2GHz bandwidth w HEMT) SiO J=1-0 v=1 and 2 (v=0, 3) too at 43.122 and 42.820 GHz 29SiO 42.879 GHz H53alpha 42.951 GHz (HOCO+ 202-101 42.767 GHz)






Survey areas (All sky >>GC)
2000/3600 searched

IRAS MSX/2MASS

GC: LAV


Survey areas (All sky >>GC)
2000/3600 searched

IRAS MSX/2MASS

Fujii et al. 2006, PASJ, 58, 529 Deguchi, et al.2004, PASJ 56, 261

GC: LAV


Color Selection Criteria



IRAS IIIa&b
F12>3 Jy -0.1






MSX

(Fc>2 Jy) -0.4


2MASS
H-K>0.8

Correct K mag.
mK=K-1.5*[(H-K)-0.5]

(distance measure)


Color Selection Criteria



IRAS IIIa&b
F12>3 Jy -0.1






MSX

(Fc>2 Jy) -0.4


2MASS
H-K>0.8

Correct K mag.
mK=K-1.5*[(H-K)-0.5]

(distance measure)


Color Selection Criteria



IRAS IIIa&b
F12>3 Jy -0.1






MSX

(Fc>2 Jy) -0.4


2MASS
H-K>0.8

Correct K mag.
mK=K-1.5*[(H-K)-0.5]

(distance measure)


14 Red Supergaints in a Sct Cluster
(Bica et al. 2003 #122)


Figer et al 2006 CO first-overtone band





Age
8--13 Myr

Mass
3 104 Msun
Nakashima & Deguchi 2006 ApJL 647, 139



Vlsr or distance? Velocity dispersion


14 Red Supergaints in a Sct Cluster
(Bica et al. 2003 #122)


Figer et al 2006 CO first-overtone band





Age
8--13 Myr

Mass
3 104 Msun
Nakashima & Deguchi 2006 ApJL 647, 139



Vlsr or distance? Velocity dispersion


What is revealed ?


Vave=118.1±2.8 km/s Previous OH (102 km/s) Dkin=6.5 kpc (7.2kpc) Dispersion from 4 obj. (intrinsic 2km/s) -> 2.0-2.5 km/s Virial mass 104 Msun



Scutum-Crux & Norma


V838 Mon


V838 Mon Nova erupted in 2002 light echo Deguchi et al. 2005 Binary merging (M&A) M-supergiant created A few percent of

OH/SiO/IR sources not originated from AGB stellar evolution


V838 Mon


V838 Mon Nova erupted in 2002 light echo Deguchi et al. 2005 Binary merging (M&A) M-supergiant created A few percent of

OH/SiO/IR sources not originated from AGB stellar evolution


V838 Mon


V838 Mon Nova erupted in 2002 light echo Deguchi et al. 2005 Binary merging (M&A) M-supergiant created A few percent of

OH/SiO/IR sources not originated from AGB stellar evolution


Globular clusters


Matsunaga et al. 2005 Bulge Glb. Cl.

Metal poor environment AGB -low mass ->C-rich Not much IRAS obj. Blue Struggler Mergers
possibly as V838 Mon Radial velocity ?
Terzan 5


Globular clusters


Matsunaga et al. 2005 Bulge Glb. Cl.

Metal poor environment AGB -low mass ->C-rich Not much IRAS obj. Blue Struggler Mergers
possibly as V838 Mon Radial velocity ?
Terzan 5


SiO Maser Search in the tidal tail of

SagDEG & CMa dwarf
SagDEG 24 Vlsr=170 km/s

kpc

CMa

dwarf 7 kpc

Vlsr=110 km/s

SagDEG LMC

CMa


SiO Maser Search in the tidal tail of

SagDEG & CMa dwarf
SagDEG 24 Vlsr=170 km/s

kpc

CMa

dwarf 7 kpc

Vlsr=110 km/s

0.8 0.6
Ta(K)

SagDEG

C05461 040226.8

0.4 0.2 0 -0.2

CMa

v=2

LMC

v=1

50

100 150 -1 V (km s )
lsr

200


Conclusions


SiO masers as a powerful probe of the Galactic structure and stellar evolution V838 Mon emits SiO Masers, A Living Example of Stellar Mergers Star Clusters/Open and Globular and Tidal tails of Dwarf galaxies